winform --自定义日期控件

 新建一个用户控件，然后直接上代码：

 public partial class UCCalendarControl : UserControl
    {

        public event MouseEventHandler ChildItemMouseClick = null;//子项鼠标事件
       
        public int bb { get; set; }
        private Panel panel_Container { get; set; }
        private Panel panel_Top { get; set; }
        #region 日期最上层top
        private PictureBox YearPicLeft { get; set; }
        private PictureBox MonthPicLeft { get; set; }
        private PictureBox MonthPicRight { get; set; }
        private PictureBox YearPicRight { get; set; }
        private Label label_Year { get; set; }
        private Label label_Month { get; set; }
        private Label YM_Label { get; set; }
        #endregion
        #region 时分秒选择
        private Label labelHour { get; set; }
        private Label labelMin { get; set; }

        private Label labelSec { get; set; }

        private Control HourControl { get; set; }
        private Control MinControl { get; set; }
        private Control SecControl { get; set; }
        private FlowLayoutPanel flowHour { get; set; }
        private FlowLayoutPanel flowMin { get; set; }
        private FlowLayoutPanel flowSec { get; set; }

        #endregion
        private Panel panel_Bottom { get; set; }


        private Panel panel_Bottom_Top { get; set; }

        private Panel panel_Bottom_Bottom { get; set; }

        private Panel panel_Bottom_Top_Top { get; set; }
        private Panel panel_Bottom_Top_Bottom { get; set; }

        private string timeFormat { get; set; }="yyyy-MM-dd";
        [Description("时间格式"), Category("自定义")]
        public string TimeFormat
        {
            get { return timeFormat; }
            set
             {

                if (value != "yyyy-MM-dd" || value != "yyyy-MM-dd HH:mm:ss")
                    timeFormat = value;
                else 
                {
                    MessageBox.Show("日期格式为：yyyy-MM-dd 或者 yyyy-MM-dd HH:mm:ss");
                    this.timeFormat = "yyyy-MM-dd";
                    value = "yyyy-MM-dd";

                }

            }
        }
        private Label label_Date { get; set; }

       public DateTime CurrentTime { get; set; } = DateTime.Now;
        public string TimeValue
        {
            get
            {
                if (Input_Time != null) return Input_Time.Text.ToString();
                else return "";
            }
        }
        private Control CurrentControl { get; set; }
        private int TimeType { get; set; } = (int)EnumDate.日;
        private Popup popup { get; set; }
        public UCCalendarControl()
        {
            InitializeComponent();
            this.Input_Time.Paint += Input_Time_Panit;
            this.Input_Time.Click += Input_Time_Click;
            ///this.Input_Time.MouseEnter += MouseEnterClick;
            // this.Input_Time.MouseLeave += MouseLeaveClick;
            this.Input_Time.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");
            Init();
        }
        public void SetTime(DateTime time)
        {
            this.Input_Time.Text = time.ToString("yyyy-MM-dd HH:mm:ss");

        }
        private void Input_Time_Click(object? sender, EventArgs e)
        {
            TimeType = (int)EnumDate.日;

            this.panel_Bottom_Top.Controls.Clear();
            InitData();
            popup = new Popup(panel_Container);
            popup.Show(this);
        }

        private void Input_Time_Panit(object? sender, PaintEventArgs e)
        {
            ControlPaint.DrawBorder(e.Graphics,//获取进行绘制的图形
           new Rectangle(0, 0, this.Input_Time.Width, this.Input_Time.Height),//绘制控件所在工作区域
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid,//边框类型，选择实线边框，也有虚线等种类；下面这四个重复的传参是设置工作区上下左右边框的功能
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid,
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid,
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid);
        }

        #region 初始化数据
        private void Init()
        {
            #region 日期容器,最外层
            this.panel_Container = new Panel();
            this.panel_Container.Padding = new Padding(10, 10, 10, 10);
            this.panel_Container.Height = 490;
            this.panel_Container.Width = 370;
            this.panel_Container.BackColor = Color.White;

            #region 最上方日期   Top
            this.panel_Top = new Panel();

            this.panel_Top.Parent = this.panel_Container;
            this.panel_Top.Dock = DockStyle.Top;
            this.panel_Top.Height = 60;
            //this.panel_Top.BackColor = Color.Blue;
            #endregion
            #region 最下放  Bottom
            this.panel_Bottom = new Panel();
            this.panel_Bottom.Dock = DockStyle.Bottom;
            this.panel_Bottom.Parent = this.panel_Container;
            this.panel_Bottom.Height = 410;
            // this.panel_Bottom.BackColor = Color.Red;
            #endregion
            #region 日期+天
            this.panel_Bottom_Top = new Panel();
            this.panel_Bottom_Top.Parent = this.panel_Bottom;
            this.panel_Bottom_Top.Dock = DockStyle.Top;
            this.panel_Bottom_Top.Height = 350;

            //  this.panel_Bottom_Top.BackColor = Color.Green;
            #endregion
            #region 最下方的选择时间按钮和显示当前选中的日期
            this.panel_Bottom_Bottom = new Panel();
            this.panel_Bottom_Bottom.Parent = this.panel_Bottom;
            this.panel_Bottom_Bottom.Dock = DockStyle.Bottom;
            this.panel_Bottom_Bottom.Height = 60;
            //this.panel_Bottom_Bottom.Padding=new Padding(50,20,10,10);

            // this.panel_Bottom_Bottom.BackColor = Color.Gray;
            #endregion


            #endregion

            #region 最下方的日期显示，小时选择按钮，确定按钮
            label_Date = new Label();
            label_Date.Parent = this.panel_Bottom_Bottom;
            label_Date.Size = new Size(200, 60);
            label_Date.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");
            label_Date.TextAlign = ContentAlignment.MiddleCenter;
            label_Date.AutoSize = false;
            label_Date.Location = new Point(0, 0);//位置

            Label label_SeletTime = new Label();
            label_SeletTime.Parent = this.panel_Bottom_Bottom;
            label_SeletTime.Size = new Size(80, 30);
            label_SeletTime.Text = "选择时间";
            label_SeletTime.TextAlign = ContentAlignment.MiddleCenter;
            label_SeletTime.AutoSize = false;
            label_SeletTime.Location = new Point(200, 15);//位置
            label_SeletTime.Click += label_SeletTime_Click;
            label_SeletTime.MouseEnter += MouseEnterClick;
            label_SeletTime.MouseLeave += MouseLeaveClick;
            label_SeletTime.Paint += label_SeletTime_Painit;


            Label label_Sure = new Label();
            label_Sure.Parent = this.panel_Bottom_Bottom;
            label_Sure.Size = new Size(60, 30);
            label_Sure.Text = "确定";
            label_Sure.TextAlign = ContentAlignment.MiddleCenter;
            label_Sure.AutoSize = false;
            label_Sure.Location = new Point(280, 15);//位置
            label_Sure.Click += label_Sure_Click;
            label_Sure.MouseEnter += MouseEnterClick;
            label_Sure.MouseLeave += MouseLeaveClick;
            label_Sure.MouseClick += ChildItemMouseClick;
            label_Sure.Paint += label_Sure_Painit;
            #endregion
        }


        #endregion
        #region 选择年月
        private void Month_InitDataTop()
        {
            this.panel_Top.Controls.Remove(MonthPicRight);
            this.panel_Top.Controls.Remove(MonthPicLeft);

            this.panel_Top.Controls.Remove(label_Year);
            this.panel_Top.Controls.Remove(label_Month);

            YM_Label = new Label();
            YM_Label.Size = new Size(150, 50);
            YM_Label.Tag = CurrentTime.Year;
            YM_Label.Text = TimeType == (int)EnumDate.年 ? CurrentTime.Year - 7 + " 年" + "~" + (CurrentTime.Year + 7) + " 年" : CurrentTime.Year + " 年";
            YM_Label.TextAlign = ContentAlignment.MiddleCenter;
            YM_Label.Parent = this.panel_Top;
            YM_Label.AutoSize = false;
            YM_Label.Location = new Point(100, 0);//位置


            SetYM();
        }
        private void SetYM()
        {
            switch (TimeType)
            {

                case (int)EnumDate.月:
                    this.panel_Bottom_Top.Controls.Clear();
                    int Mcount = 0;
                    int Mrowcount = 15;
                    for (int i = 1; i <= 12; i++)
                    {
                        Mcount++;
                        Label label = new Label();
                        label.Size = new Size(80, 60);
                        label.Text = i + "月";
                        label.Tag = i;
                        if (i == CurrentTime.Month)
                        {
                            label.ForeColor = Color.White;
                            label.BackColor = Color.FromArgb(0, 159, 149);
                        }
                        label.Click += Month_Click;
                        label.MouseEnter += Month_MouseEnterClick;
                        label.MouseLeave += Month_MouseLeaveClick;
                        label.TextAlign = ContentAlignment.MiddleCenter;
                        label.Parent = this.panel_Bottom_Top;
                        label.AutoSize = false;
                        label.Location = new Point((Mcount - 1) * 80 + Mcount * 10, Mrowcount);//位置
                        if (Mcount % 4 == 0) { Mcount = 0; Mrowcount += 115; }
                    }


                    break;
                case (int)EnumDate.年:
                    this.panel_Bottom_Top.Controls.Clear();
                    int Ycount = 0;
                    int Yrowcount = 1;
                    for (int i = CurrentTime.Year - 7; i <= CurrentTime.Year + 7; i++)
                    {
                        Ycount++;
                        Label label = new Label();
                        label.Size = new Size(116, 70);
                        label.Text = i + "年";
                        label.Tag = i;
                        if (i == CurrentTime.Year)
                        {
                            label.ForeColor = Color.White;
                            label.BackColor = Color.FromArgb(0, 159, 149);
                        }
                        label.Click += Year_Click;
                        label.MouseEnter += Year_MouseEnterClick;
                        label.MouseLeave += Year_MouseLeaveClick;
                        label.TextAlign = ContentAlignment.MiddleCenter;
                        label.Parent = this.panel_Bottom_Top;
                        label.AutoSize = false;
                        label.Location = new Point((Ycount - 1) * 116, Yrowcount);//位置
                        if (Ycount % 3 == 0) { Ycount = 0; Yrowcount += 70; }
                    }


                    break;
            }
        }

        private void Year_MouseLeaveClick(object? sender, EventArgs e)
        {
            Label label = sender as Label;
            if ((int)YM_Label.Tag == CurrentTime.Year)
            {
                if ((int)label.Tag != CurrentTime.Year) label.BackColor = Color.White;

            }
            else
            {
                if ((int)label.Tag != (int)YM_Label.Tag) label.BackColor = Color.White;

            }
        }

        private void Year_MouseEnterClick(object? sender, EventArgs e)
        {
            Label label = sender as Label;
            label.Cursor = Cursors.Hand;
            if ((int)YM_Label.Tag == CurrentTime.Year)
            {
                if ((int)label.Tag != CurrentTime.Year) label.BackColor = Color.FromArgb(224, 224, 224);

            }
            else
            {
                if ((int)label.Tag != (int)YM_Label.Tag) label.BackColor = Color.FromArgb(224, 224, 224);

            }
        }

        private void Year_Click(object? sender, EventArgs e)
        {
            Label label = sender as Label;
            int year = (int)label.Tag - CurrentTime.Year;
            //获取去年这个月多少天
            var dayscount = DateTime.DaysInMonth(CurrentTime.AddYears(year).Year, CurrentTime.AddYears(year).Month);
            CurrentTime = CurrentTime.Day <= dayscount ?
                new DateTime(CurrentTime.AddYears(year).Year, CurrentTime.AddYears(year).Month, CurrentTime.Day, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second)
                : new DateTime(CurrentTime.AddYears(year).Year, CurrentTime.AddYears(year).Month, dayscount, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second);
            TimeType = (int)EnumDate.日;
            InitDayTop();
            this.panel_Bottom_Top.Controls.Clear();
            InitData();
            label_Year.Text = CurrentTime.Year + " 年";
            label_Month.Text = CurrentTime.Month + " 月";
            this.label_Date.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");
        }

        private void Month_MouseLeaveClick(object? sender, EventArgs e)
        {
            Label label = sender as Label;
            if ((int)label.Tag != CurrentTime.Month) label.BackColor = Color.White;
        }

        private void Month_MouseEnterClick(object? sender, EventArgs e)
        {
            Label label = sender as Label;
            label.Cursor = Cursors.Hand;
            if ((int)label.Tag != CurrentTime.Month) label.BackColor = Color.FromArgb(224, 224, 224);
        }

        private void Month_Click(object? sender, EventArgs e)
        {
            Label label = sender as Label;
            //获取上个月多少天
            var dayscount = DateTime.DaysInMonth((int)YM_Label.Tag, (int)label.Tag);
            CurrentTime = CurrentTime.Day <= dayscount ?
                new DateTime((int)YM_Label.Tag, (int)label.Tag, CurrentTime.Day, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second)
                : new DateTime((int)YM_Label.Tag, (int)label.Tag, dayscount, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second);
            TimeType = (int)EnumDate.日;
            InitDayTop();
            this.panel_Bottom_Top.Controls.Clear();
            InitData();
            label_Year.Text = CurrentTime.Year + " 年";
            label_Month.Text = CurrentTime.Month + " 月";
            this.label_Date.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");
        }
        #endregion
        #region  选择天
        private void InitData()
        {


            #region 日期： 一  二 三  四 
            this.panel_Bottom_Top_Top = new Panel();
            this.panel_Bottom_Top_Top.Parent = this.panel_Bottom_Top;
            this.panel_Bottom_Top_Top.Dock = DockStyle.Top;
            this.panel_Bottom_Top_Top.Height = 50;
            this.panel_Bottom_Top_Top.BorderStyle = BorderStyle.FixedSingle;

            // this.panel_Bottom_Top_Top.BackColor = Color.Pink;
            #endregion

            #region 中间内容---最上方=Top
            this.panel_Bottom_Top_Bottom = new Panel();
            this.panel_Bottom_Top_Bottom.Parent = this.panel_Bottom_Top;
            this.panel_Bottom_Top_Bottom.Dock = DockStyle.Bottom;
            this.panel_Bottom_Top_Bottom.Height = 300;

            // this.panel_Bottom_Top_Bottom.BackColor = Color.Black;

            #endregion
            InitDayTop();
            Day_InitWeek();
            SetDay(CurrentTime);

        }
        private void Day_InitWeek()
        {
            string[] strWeek = new string[] { "一", "二", "三", "四", "五", "六", "日" };
            for (int i = 0; i < strWeek.Length; i++)
            {
                Label label = new Label();
                label.Size = new Size(50, 50);
                label.Text = strWeek[i];
                label.TextAlign = ContentAlignment.MiddleCenter;
                label.Parent = this.panel_Bottom_Top_Top;
                label.AutoSize = false;
                label.Location = new Point((i) * 50, 0);//位置
            }
        }
        private void InitDayTop()
        {

            this.panel_Top.Controls.Clear();
            this.panel_Top.Padding = new Padding(0, 5, 0, 5);
            YearPicLeft = new PictureBox();
            YearPicLeft.Size = new Size(50, 50);
            YearPicLeft.BackgroundImage = Properties.Resources.lefts;
            YearPicLeft.Parent = this.panel_Top;
            YearPicLeft.Location = new Point(0, 0);
            YearPicLeft.SizeMode = PictureBoxSizeMode.AutoSize;
            YearPicLeft.BackgroundImageLayout = ImageLayout.Center;
            YearPicLeft.Click += YearPicLeft_Click;
            YearPicLeft.MouseEnter += MouseEnterClick;
            YearPicLeft.MouseLeave += MouseLeaveClick;


            YearPicRight = new PictureBox();
            YearPicRight.Size = new Size(50, 50);
            YearPicRight.BackgroundImage = Properties.Resources.rights;
            YearPicRight.Parent = this.panel_Top;
            YearPicRight.Location = new Point(300, 0);
            YearPicRight.SizeMode = PictureBoxSizeMode.AutoSize;
            YearPicRight.BackgroundImageLayout = ImageLayout.Center;
            YearPicRight.Click += YearPicRight_Click;
            YearPicRight.MouseEnter += MouseEnterClick;
            YearPicRight.MouseLeave += MouseLeaveClick;

            MonthPicLeft = new PictureBox();
            MonthPicLeft.Size = new Size(50, 50);
            MonthPicLeft.BackgroundImage = Properties.Resources.left;
            MonthPicLeft.Parent = this.panel_Top;
            MonthPicLeft.Location = new Point(50, 0);
            MonthPicLeft.SizeMode = PictureBoxSizeMode.AutoSize;
            MonthPicLeft.BackgroundImageLayout = ImageLayout.Center;
            MonthPicLeft.Click += MonthPicLeft_Click;
            MonthPicLeft.MouseEnter += MouseEnterClick;
            MonthPicLeft.MouseLeave += MouseLeaveClick;



            label_Year = new Label();
            label_Year.Size = new Size(75, 50);
            // label_Year.Font = new System.Drawing.Font("幼圆", 8F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(134)));
            label_Year.Text = CurrentTime.Year + " 年";
            label_Year.TextAlign = ContentAlignment.MiddleCenter;
            label_Year.Parent = this.panel_Top;
            label_Year.AutoSize = false;
            label_Year.Location = new Point(100, 0);//位置
            label_Year.Click += label_Year_Click;
            label_Year.MouseEnter += MouseEnterClick;
            label_Year.MouseLeave += MouseLeaveClick;


            label_Month = new Label();
            label_Month.Size = new Size(75, 50);
            label_Month.Text = CurrentTime.Month + " 月";
            label_Month.TextAlign = ContentAlignment.MiddleCenter;
            label_Month.Parent = this.panel_Top;
            label_Month.AutoSize = false;
            label_Month.Location = new Point(175, 0);//位置
            label_Month.Click += label_Month_Click;
            label_Month.MouseEnter += MouseEnterClick;
            label_Month.MouseLeave += MouseLeaveClick;

            MonthPicRight = new PictureBox();
            MonthPicRight.Size = new Size(50, 50);
            MonthPicRight.BackgroundImage = Properties.Resources.right;
            MonthPicRight.Parent = this.panel_Top;
            MonthPicRight.Location = new Point(250, 0);
            MonthPicRight.SizeMode = PictureBoxSizeMode.AutoSize;
            MonthPicRight.BackgroundImageLayout = ImageLayout.Center;
            MonthPicRight.Click += MonthPicRight_Click;
            MonthPicRight.MouseEnter += MouseEnterClick;
            MonthPicRight.MouseLeave += MouseLeaveClick;

        }

        private void MonthPicRight_Click(object? sender, EventArgs e)
        {
            switch (TimeType)
            {
                case (int)EnumDate.日:
                    //获取上个月多少天
                    int dayscount = DateTime.DaysInMonth(CurrentTime.AddMonths(1).Year, CurrentTime.AddMonths(1).Month);
                    CurrentTime = CurrentTime.Day <= dayscount ?
                        new DateTime(CurrentTime.AddMonths(1).Year, CurrentTime.AddMonths(1).Month, CurrentTime.Day, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second)
                        : new DateTime(CurrentTime.AddMonths(1).Year, CurrentTime.AddMonths(1).Month, dayscount, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second);
                    label_Year.Text = CurrentTime.Year + " 年";
                    label_Month.Text = CurrentTime.Month + " 月";
                    this.label_Date.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");

                    SetDay(CurrentTime);
                    break;
                case (int)EnumDate.月:
                    YM_Label.Text = (int)YM_Label.Tag + 1 + " 年";
                    YM_Label.Tag = (int)YM_Label.Tag + 1;
                    break;
                case (int)EnumDate.年:
                    int year = (int)YM_Label.Tag + 77;
                    for (int i = 0; i < panel_Bottom_Top.Controls.Count; i++)
                    {
                        panel_Bottom_Top.Controls[i].Text = year + "年";
                        panel_Bottom_Top.Controls[i].Tag = year;
                        year++;
                    }
                    YM_Label.Tag = (int)YM_Label.Tag + 7;

                    break;
                default:
                    break;
            }
        }

        private void label_Month_Click(object? sender, EventArgs e)
        {
            TimeType = (int)EnumDate.月;
            Month_InitDataTop();
        }

        private void label_Year_Click(object? sender, EventArgs e)
        {
            TimeType = (int)EnumDate.年;
            Month_InitDataTop();
        }

        private void MonthPicLeft_Click(object? sender, EventArgs e)
        {
            //获取上个月多少天
            var dayscount = DateTime.DaysInMonth(CurrentTime.AddMonths(-1).Year, CurrentTime.AddMonths(-1).Month);
            CurrentTime = CurrentTime.Day <= dayscount ?
                new DateTime(CurrentTime.AddMonths(-1).Year, CurrentTime.AddMonths(-1).Month, CurrentTime.Day, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second)
                : new DateTime(CurrentTime.AddMonths(-1).Year, CurrentTime.AddMonths(-1).Month, dayscount, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second);
            label_Year.Text = CurrentTime.Year + " 年";
            label_Month.Text = CurrentTime.Month + " 月";
            this.label_Date.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");

            SetDay(CurrentTime);
        }

        private void YearPicRight_Click(object? sender, EventArgs e)
        {
            switch (TimeType)
            {
                case (int)EnumDate.日:
                    //获取去年这个月多少天
                    int dayscount = DateTime.DaysInMonth(CurrentTime.AddYears(1).Year, CurrentTime.AddYears(1).Month);
                    CurrentTime = CurrentTime.Day <= dayscount ?
                        new DateTime(CurrentTime.AddYears(1).Year, CurrentTime.AddYears(1).Month, CurrentTime.Day, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second)
                        : new DateTime(CurrentTime.AddYears(1).Year, CurrentTime.AddYears(1).Month, dayscount, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second);
                    label_Year.Text = CurrentTime.Year + " 年";
                    label_Month.Text = CurrentTime.Month + " 月";
                    this.label_Date.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");
                    SetDay(CurrentTime);
                    break;
                case (int)EnumDate.月:
                    YM_Label.Text = (int)YM_Label.Tag + 1 + " 年";
                    YM_Label.Tag = (int)YM_Label.Tag + 1;
                    break;
                case (int)EnumDate.年:
                    int year = (int)YM_Label.Tag + 8;
                    for (int i = 0; i < panel_Bottom_Top.Controls.Count; i++)
                    {
                        panel_Bottom_Top.Controls[i].Text = year + "年";
                        panel_Bottom_Top.Controls[i].Tag = year;
                        year++;
                    }
                    YM_Label.Text = ((int)YM_Label.Tag + 8) + " 年~" + ((int)YM_Label.Tag + 22) + " 年";

                    YM_Label.Tag = (int)YM_Label.Tag + 15;

                    break;
                default:
                    break;
            }
        }

        private void MouseLeaveClick(object? sender, EventArgs e)
        {
            var control = sender as Control;
            control.BackColor = Color.White;
        }

        private void MouseEnterClick(object? sender, EventArgs e)
        {
            var control = sender as Control;
            control.Cursor = Cursors.Hand;
            control.BackColor = Color.FromArgb(224, 224, 224);
        }

        private void YearPicLeft_Click(object? sender, EventArgs e)
        {
            switch (TimeType)
            {
                case (int)EnumDate.日:
                    //获取去年这个月多少天
                    int dayscount = DateTime.DaysInMonth(CurrentTime.AddYears(-1).Year, CurrentTime.AddYears(-1).Month);
                    CurrentTime = CurrentTime.Day <= dayscount ?
                        new DateTime(CurrentTime.AddYears(-1).Year, CurrentTime.AddYears(-1).Month, CurrentTime.Day, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second)
                        : new DateTime(CurrentTime.AddYears(-1).Year, CurrentTime.AddYears(-1).Month, dayscount, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second);
                    label_Year.Text = CurrentTime.Year + " 年";
                    label_Month.Text = CurrentTime.Month + " 月";
                    this.label_Date.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");
                    SetDay(CurrentTime);
                    break;
                case (int)EnumDate.月:
                    YM_Label.Text = (int)YM_Label.Tag - 1 + " 年";
                    YM_Label.Tag = (int)YM_Label.Tag - 1;
                    break;
                case (int)EnumDate.年:
                    int year = (int)YM_Label.Tag - 22;
                    for (int i = 0; i < panel_Bottom_Top.Controls.Count; i++)
                    {
                        panel_Bottom_Top.Controls[i].Text = year + "年";
                        panel_Bottom_Top.Controls[i].Tag = year;
                        year++;
                    }
                    YM_Label.Text = ((int)YM_Label.Tag - 22) + " 年~" + ((int)YM_Label.Tag - 8) + " 年";
                    YM_Label.Tag = (int)YM_Label.Tag - 15;

                    break;
                default:
                    break;
            }
        }

        public void SetDay(DateTime time)
        {
            this.panel_Bottom_Top_Bottom.Controls.Clear();
            var list = GetDays(time);
            int count = 0;
            int rowcount = 1;
            foreach (var item in list)
            {
                count++;
                Label label = new Label();
                label.Size = new Size(50, 50);
                label.Text = item.Item2.ToString();
                if (item.Item1 == 0 || item.Item1 == -1) label.ForeColor = Color.Gray;
                if (item.Item1 == 1 && item.Item2 == CurrentTime.Day)
                {
                    label.ForeColor = Color.White;
                    label.BackColor = Color.FromArgb(0, 159, 149);
                    CurrentControl = label;
                }
                label.TextAlign = ContentAlignment.MiddleCenter;
                label.Parent = this.panel_Bottom_Top_Bottom;
                label.Tag = item;
                label.Click += Day_Click;
                label.MouseEnter += Day_MouseEnterClick;
                label.MouseLeave += Day_MouseLeaveClick;
                label.AutoSize = false;
                label.Location = new Point((count - 1) * 50, rowcount);//位置
                if (count % 7 == 0) { count = 0; rowcount += 50; }
            }
        }

        private void Day_MouseLeaveClick(object? sender, EventArgs e)
        {
            var label = sender as Label;
            var tuple = label.Tag as Tuple<int, int>;
            if (CurrentControl != null && CurrentControl != label)
            {
                label.BackColor = Color.White;
                if (tuple != null && (tuple.Item1 == 0 || tuple.Item1 == -1)) label.ForeColor = Color.Gray;
            }
        }

        private void Day_MouseEnterClick(object? sender, EventArgs e)
        {
            var label = sender as Label;
            label.Cursor = Cursors.Hand;
            if (CurrentControl != null && CurrentControl != label)
            {
                label.BackColor = Color.FromArgb(224, 224, 224);
                label.ForeColor = Color.Black;
            }
        }

        private void Day_Click(object? sender, EventArgs e)
        {
            var label = sender as Label;
            var tuple = label.Tag as Tuple<int, int>;
            if (tuple != null)
            {
                switch (tuple.Item1)
                {
                    case 0:
                        CurrentTime = new DateTime(CurrentTime.AddMonths(-1).Year, CurrentTime.AddMonths(-1).Month, tuple.Item2, CurrentTime.AddMonths(-1).Hour, CurrentTime.AddMonths(-1).Minute, CurrentTime.AddMonths(-1).Second);
                        break;
                    case 1:
                        CurrentTime = new DateTime(CurrentTime.Year, CurrentTime.Month, tuple.Item2, CurrentTime.Hour, CurrentTime.Minute, CurrentTime.Second);
                        break;
                    case -1:
                        CurrentTime = new DateTime(CurrentTime.AddMonths(1).Year, CurrentTime.AddMonths(1).Month, tuple.Item2, CurrentTime.AddMonths(1).Hour, CurrentTime.AddMonths(1).Minute, CurrentTime.AddMonths(1).Second);
                        break;
                }
                label_Year.Text = CurrentTime.Year + " 年";
                label_Month.Text = CurrentTime.Month + " 月";
                this.label_Date.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");

                if (tuple.Item1 != 1) SetDay(CurrentTime);
                if (CurrentControl != label && tuple.Item1 == 1)
                {
                    CurrentControl.BackColor = Color.White;
                    CurrentControl.ForeColor = Color.Black;
                    label.ForeColor = Color.White;
                    label.BackColor = Color.FromArgb(0, 159, 149);
                    CurrentControl = label;
                }
            }
        }

        public List<Tuple<int, int>> GetDays(DateTimeOffset date)
        {
            // 获取当月第一天的日期
            var CurrentFirstDayOfMonth = new DateTimeOffset(date.Year, date.Month, 1, 0, 0, 0, date.Offset);
            // 获取当月最后一天的日期
            var CurrentDayOfMonth = CurrentFirstDayOfMonth.AddMonths(1).AddDays(-1);
            // 获取当月第一天前面的空白格子
            var CurrentFristDayOfMonth = ((int)CurrentFirstDayOfMonth.DayOfWeek + 7 - (int)DayOfWeek.Monday) % 7;
            // 获取当月最后一天后面的空白格子
            var trailingSpaces = (int)DayOfWeek.Saturday + 1 - (int)CurrentDayOfMonth.DayOfWeek;
            //获取上个月的天数
            var LastTime = date.AddMonths(-1);
            int LastDayOfMonth = DateTime.DaysInMonth(LastTime.Year, LastTime.Month);
            var daylist = new List<Tuple<int, int>>();
            if (CurrentFristDayOfMonth == 7) for (int i = LastDayOfMonth - 7 + 1; i <= LastDayOfMonth; i++) daylist.Add(Tuple.Create(0, i));
            else for (int i = LastDayOfMonth - CurrentFristDayOfMonth + 1; i <= LastDayOfMonth; i++) daylist.Add(Tuple.Create(0, i));
            for (int i = 1; i <= CurrentDayOfMonth.Day; i++) daylist.Add(Tuple.Create(1, i));
            var daycount = daylist.Count; ;
            for (int i = 1; i <= 42 - daycount; i++) daylist.Add(Tuple.Create(-1, i));
            return daylist;
        }
        #endregion
        #region 下方的时间选择
        private void InitTimeData()
        {
            this.panel_Top.Controls.Clear();
            TimeType = (int)EnumDate.时;
            Label labelTime = new Label();

            labelTime.Text = "选择时间";
            labelTime.TextAlign = ContentAlignment.MiddleCenter;
            labelTime.Parent = this.panel_Top;
            labelTime.AutoSize = false;
            labelTime.Dock = DockStyle.Fill;
            this.panel_Bottom_Top_Top.Controls.Clear();
            labelHour = new Label();
            labelHour.Size = new Size(110, 50);
            labelHour.Text = "时";
            labelHour.Tag = CurrentTime.Hour;
            labelHour.TextAlign = ContentAlignment.MiddleCenter;
            labelHour.Parent = this.panel_Bottom_Top_Top;
            labelHour.AutoSize = false;
            labelHour.Location = new Point(0, 0);//位置

            labelMin = new Label();
            labelMin.Size = new Size(110, 50);
            labelMin.Text = "分";
            labelMin.Tag = CurrentTime.Minute;
            labelMin.TextAlign = ContentAlignment.MiddleCenter;
            labelMin.Parent = this.panel_Bottom_Top_Top;
            labelMin.AutoSize = false;
            labelMin.Location = new Point(110, 0);//位置

            labelSec = new Label();
            labelSec.Size = new Size(110, 50);
            labelSec.Text = "秒";
            labelSec.Tag = CurrentTime.Second;
            labelSec.TextAlign = ContentAlignment.MiddleCenter;
            labelSec.Parent = this.panel_Bottom_Top_Top;
            labelSec.AutoSize = false;
            labelSec.Location = new Point(220, 0);//位置


            this.panel_Bottom_Top_Bottom.Controls.Clear();
            flowHour = new FlowLayoutPanel();
            flowHour.Size = new Size(110, 300);
            flowHour.Parent = this.panel_Bottom_Top_Bottom;
            flowHour.Location = new Point(10, 0);//位置
            flowHour.AutoScroll = true; ;
            for (int i = 0; i < 24; i++)
            {
                Label lHour = new Label();
                lHour.Size = new Size(80, 50);
                if (i < 10) lHour.Text = "0" + i;
                else lHour.Text = i.ToString();
                lHour.Tag = i;
                if (i == (int)labelHour.Tag)
                {
                    lHour.ForeColor = Color.White;
                    lHour.BackColor = Color.FromArgb(0, 159, 149);
                    HourControl = lHour;

                }
                lHour.Click += lHour_Click;
                lHour.MouseEnter += lHour_MouseEnterClick;
                lHour.MouseLeave += lHour_MouseLeaveClick;
                lHour.TextAlign = ContentAlignment.MiddleCenter;
                lHour.AutoSize = false;
                lHour.Location = new Point(0, i * 50);//位置
                                                      // label.BackColor = Color.Gray;
                flowHour.Controls.Add(lHour);

            }
            flowMin = new FlowLayoutPanel();
            flowMin.Size = new Size(110, 300);
            flowMin.Parent = this.panel_Bottom_Top_Bottom;
            flowMin.Location = new Point(120, 0);//位置
            flowMin.AutoScroll = true; ;
            for (int i = 0; i < 60; i++)
            {
                Label lMin = new Label();
                lMin.Size = new Size(80, 50);
                if (i < 10) lMin.Text = "0" + i;
                else lMin.Text = i.ToString();
                lMin.Tag = i;
                if (i == (int)labelMin.Tag)
                {
                    lMin.ForeColor = Color.White;
                    lMin.BackColor = Color.FromArgb(0, 159, 149);
                    MinControl = lMin;
                }
                lMin.Click += lMin_Click;
                lMin.MouseEnter += lMin_MouseEnterClick;
                lMin.MouseLeave += lMin_MouseLeaveClick;
                lMin.TextAlign = ContentAlignment.MiddleCenter;
                lMin.AutoSize = false;
                lMin.Location = new Point(0, i * 50);//位置
                flowMin.Controls.Add(lMin);
            }



            flowSec = new FlowLayoutPanel();
            flowSec.Size = new Size(110, 300);
            flowSec.Parent = this.panel_Bottom_Top_Bottom;
            flowSec.Location = new Point(230, 0);//位置
            flowSec.AutoScroll = true; ;
            for (int i = 0; i < 60; i++)
            {
                Label lSec = new Label();
                lSec.Size = new Size(80, 50);
                if (i < 10) lSec.Text = "0" + i;
                else lSec.Text = i.ToString();
                lSec.Tag = i;
                if (i == (int)labelSec.Tag)
                {
                    lSec.ForeColor = Color.White;
                    lSec.BackColor = Color.FromArgb(0, 159, 149);
                    SecControl = lSec;
                }
                lSec.Click += lSec_Click;
                lSec.MouseEnter += lSec_MouseEnterClick;
                lSec.MouseLeave += lSec_MouseLeaveClick;
                lSec.TextAlign = ContentAlignment.MiddleCenter;
                lSec.AutoSize = false;
                lSec.Location = new Point(0, i * 50);//位置
                flowSec.Controls.Add(lSec);
            }
            SetSrollBar();
        }

        private void lHour_MouseLeaveClick(object? sender, EventArgs e)
        {
            var label = sender as Label;
            if ((int)label.Tag != (int)labelHour.Tag)
                label.BackColor = Color.White;

        }

        private void lHour_MouseEnterClick(object? sender, EventArgs e)
        {
            var label = sender as Label;
            label.Cursor = Cursors.Hand;
            if ((int)label.Tag != (int)labelHour.Tag)
                label.BackColor = Color.FromArgb(224, 224, 224);

        }

        private void lHour_Click(object? sender, EventArgs e)
        {
            var label = sender as Label;
            if (label != HourControl)
            {
                HourControl.BackColor = Color.White;
                HourControl.ForeColor = Color.Black;
                label.BackColor = Color.FromArgb(0, 159, 149);
                label.ForeColor = Color.White;
                HourControl = label;
            }
            labelHour.Tag = (int)label.Tag;
            SetSrollBar();
        }

        private void lMin_MouseLeaveClick(object? sender, EventArgs e)
        {
            var label = sender as Label;
            if ((int)label.Tag != (int)labelMin.Tag)
                label.BackColor = Color.White;
        }

        private void lMin_MouseEnterClick(object? sender, EventArgs e)
        {
            var label = sender as Label;
            label.Cursor = Cursors.Hand;
            if ((int)label.Tag != (int)labelMin.Tag)
                label.BackColor = Color.FromArgb(224, 224, 224);
        }

        private void lMin_Click(object? sender, EventArgs e)
        {
            var label = sender as Label;
            if (label != MinControl)
            {
                MinControl.BackColor = Color.White;
                MinControl.ForeColor = Color.Black;
                label.BackColor = Color.FromArgb(0, 159, 149);
                label.ForeColor = Color.White;
                MinControl = label;
            }
            labelMin.Tag = (int)label.Tag;
            SetSrollBar();
        }

        private void SetSrollBar()
        {
            if (((int)labelHour.Tag - 2) * 50 > flowHour.VerticalScroll.Maximum)
                flowHour.VerticalScroll.Value = flowHour.VerticalScroll.Maximum;
            else if (((int)labelHour.Tag - 2) * 50 < flowHour.VerticalScroll.Minimum)
                flowHour.VerticalScroll.Value = flowHour.VerticalScroll.Minimum;
            else flowHour.VerticalScroll.Value = ((int)labelHour.Tag - 2) * 50;

            if (((int)labelMin.Tag - 2) * 50 > flowMin.VerticalScroll.Maximum)
                flowMin.VerticalScroll.Value = flowMin.VerticalScroll.Maximum;
            else if (((int)labelMin.Tag - 2) * 50 < flowMin.VerticalScroll.Minimum)
                flowMin.VerticalScroll.Value = flowMin.VerticalScroll.Minimum;
            else flowMin.VerticalScroll.Value = ((int)labelMin.Tag - 2) * 50;

            if (((int)labelSec.Tag - 2) * 50 > flowSec.VerticalScroll.Maximum)
                flowSec.VerticalScroll.Value = flowSec.VerticalScroll.Maximum;
            if (((int)labelSec.Tag - 2) * 50 < flowSec.VerticalScroll.Minimum)
                flowSec.VerticalScroll.Value = flowSec.VerticalScroll.Minimum;
            else flowSec.VerticalScroll.Value = ((int)labelSec.Tag - 2) * 50;
        }
        private void lSec_MouseLeaveClick(object? sender, EventArgs e)
        {
            var label = sender as Label;
            if ((int)label.Tag != (int)labelSec.Tag)
                label.BackColor = Color.White;

        }

        private void lSec_MouseEnterClick(object? sender, EventArgs e)
        {
            var label = sender as Label;
            label.Cursor = Cursors.Hand;
            if ((int)label.Tag != (int)labelSec.Tag)
                label.BackColor = Color.FromArgb(224, 224, 224);

        }

        private void lSec_Click(object? sender, EventArgs e)
        {
            var label = sender as Label;
            if (label != SecControl)
            {
                SecControl.BackColor = Color.White;
                SecControl.ForeColor = Color.Black;
                label.BackColor = Color.FromArgb(0, 159, 149);
                label.ForeColor = Color.White;
                SecControl = label;
            }
            labelSec.Tag = (int)label.Tag;
            SetSrollBar();
        }


        private void label_Sure_Painit(object? sender, PaintEventArgs e)
        {
            Label label = sender as Label;
            ControlPaint.DrawBorder(e.Graphics,//获取进行绘制的图形
           new Rectangle(0, 0, label.Width, label.Height),//绘制控件所在工作区域
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid,//边框类型，选择实线边框，也有虚线等种类；下面这四个重复的传参是设置工作区上下左右边框的功能
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid,
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid,
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid);
        }


        private void label_Sure_Click(object? sender, EventArgs e)
        {
            if (TimeType == (int)EnumDate.时)
            {
                CurrentTime = new DateTime(CurrentTime.Year, CurrentTime.Month, CurrentTime.Day, (int)labelHour.Tag, (int)labelMin.Tag, (int)labelSec.Tag);
                label_Date.Text = CurrentTime.ToString("yyyy-MM-dd HH:mm:ss");
                TimeType = (int)EnumDate.日;
            }
            this.Input_Time.Text = label_Date.Text;

            popup.Close();
        }

        private void label_SeletTime_Painit(object? sender, PaintEventArgs e)
        {
            Label label = sender as Label;
            ControlPaint.DrawBorder(e.Graphics,//获取进行绘制的图形
           new Rectangle(0, 0, label.Width, label.Height),//绘制控件所在工作区域
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid,//边框类型，选择实线边框，也有虚线等种类；下面这四个重复的传参是设置工作区上下左右边框的功能
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid,
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid,
           Color.FromArgb(138, 238, 238), 1, ButtonBorderStyle.Solid);
        }





        private void label_SeletTime_Click(object? sender, EventArgs e)
        {
            InitTimeData();
        }
        #endregion
    }

然后运行看一下效果：