DateTime.Now.ToString()用法
//2008年4月24日 System.DateTime.Now.ToString("D"); //2008-4-24 System.DateTime.Now.ToString("d"); //2008年4月24日 16:30:15 System.DateTime.Now.ToString("F"); //2008年4月24日 16:30 System.DateTime.Now.ToString("f"); //2008-4-24 16:30:15 System.DateTime.Now.ToString("G"); //2008-4-24 16:30 System.DateTime.Now.ToString("g"); //16:30:15 System.DateTime.Now.ToString("T"); //16:30 System.DateTime.Now.ToString("t"); //2008年4月24日 8:30:15 System.DateTime.Now.ToString("U"); //2008-04-24 16:30:15Z System.DateTime.Now.ToString("u"); //4月24日 System.DateTime.Now.ToString("m"); System.DateTime.Now.ToString("M"); //Tue, 24 Apr 2008 16:30:15 GMT System.DateTime.Now.ToString("r"); System.DateTime.Now.ToString("R"); //2008年4月 System.DateTime.Now.ToString("y"); System.DateTime.Now.ToString("Y"); //2008-04-24T15:52:19.1562500+08:00 System.DateTime.Now.ToString("o"); System.DateTime.Now.ToString("O"); //2008-04-24T16:30:15 System.DateTime.Now.ToString("s"); //2008-04-24 15:52:19 System.DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:ffff"); //2008年04月24 15时56分48秒 System.DateTime.Now.ToString("yyyy年MM月dd HH时mm分ss秒"); //星期二, 四月 24 2008 System.DateTime.Now.ToString("dddd, MMMM dd yyyy"); //二, 四月 24 ’08 System.DateTime.Now.ToString("ddd, MMM d \"’\"yy"); //星期二, 四月 24 System.DateTime.Now.ToString("dddd, MMMM dd"); //4-08 System.DateTime.Now.ToString("M/yy"); //24-04-08 System.DateTime.Now.ToString("dd-MM-yy"); / /字符型转换转为字符串 12345.ToString("n"); //生成 12,345.00 12345.ToString("C"); //生成 ¥12,345.00 12345.ToString("e"); //生成 1.234500e+004 12345.ToString("f4"); //生成 12345.0000 12345.ToString("x"); //生成 3039 (16进制) 12345.ToString("p"); //生成 1,234,500 //本年度销售额、本季度利润、本月新增客户 //今天 DateTime.Now.Date.ToShortDateString(); //昨天,就是今天的日期减一 DateTime.Now.AddDays(-1).ToShortDateString(); //明天,同理,加一 DateTime.Now.AddDays(1).ToShortDateString(); //本周(要知道本周的第一天就得先知道今天是星期几,从而得知本周的第一天就是几天前的那一天,要注意的是这里的每一周是从周日始至周六止 DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString(); DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString(); //如果你还不明白,再看一下中文显示星期几的方法就应该懂了 //由于DayOfWeek返回的是数字的星期几,我们要把它转换成汉字方便我们阅读,有些人可能会用switch来一个一个地对照,其实不用那么麻烦的 string[] Day = new string[]{ "星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六" }; Day[Convert.ToInt16(DateTime.Now.DayOfWeek)]; //上周,同理,一个周是7天,上周就是本周再减去7天,下周也是一样 DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString(); DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString(); //下周 DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString(); DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString(); //本月,很多人都会说本月的第一天嘛肯定是1号,最后一天就是下个月一号再减一天。当然这是对的 //一般的写法 DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + "1"; //第一天 DateTime.Parse(DateTime.Now.Year.ToString() + DateTime.Now.Month.ToString() + "1").AddMonths(1).AddDays(-1).ToShortDateString();//最后一天 //巧用C#里ToString的字符格式化更简便 DateTime.Now.ToString("yyyy-MM-01"); DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(1).AddDays(-1).ToShortDateString(); //上个月,减去一个月份 DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(-1).ToShortDateString(); DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddDays(-1).ToShortDateString(); //下个月,加去一个月份 DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(1).ToShortDateString(); DateTime.Parse(DateTime.Now.ToString("yyyy-MM-01")).AddMonths(2).AddDays(-1).ToShortDateString(); //7天后 DateTime.Now.Date.ToShortDateString(); DateTime.Now.AddDays(7).ToShortDateString(); //7天前 DateTime.Now.AddDays(-7).ToShortDateString(); DateTime.Now.Date.ToShortDateString(); //本年度,用ToString的字符格式化我们也很容易地算出本年度的第一天和最后一天 DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).ToShortDateString(); DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddYears(1).AddDays(-1).ToShortDateString(); //上年度,不用再解释了吧 DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddYears(-1).ToShortDateString(); DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddDays(-1).ToShortDateString(); //下年度 DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddYears(1).ToShortDateString(); DateTime.Parse(DateTime.Now.ToString("yyyy-01-01")).AddYears(2).AddDays(-1).ToShortDateString(); //本季度,很多人都会觉得这里难点,需要写个长长的过程来判断。其实不用的,我们都知道一年四个季度,一个季度三个月 //首先我们先把日期推到本季度第一个月,然后这个月的第一天就是本季度的第一天了 DateTime.Now.AddMonths(0 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01"); //同理,本季度的最后一天就是下季度的第一天减一 DateTime.Parse(DateTime.Now.AddMonths(22 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01")).AddDays(-1).ToShortDateString(); //下季度,相信你们都知道了。。。。收工 DateTime.Now.AddMonths(22 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01"); DateTime.Parse(DateTime.Now.AddMonths(6 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01")).AddDays(-1).ToShortDateString(); //上季度 DateTime.Now.AddMonths(-22 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01"); DateTime.Parse(DateTime.Now.AddMonths(0 - ((DateTime.Now.Month - 1) % 22)).ToString("yyyy-MM-01")).AddDays(-1).ToShortDateString();
//2007年4月24日
this
.TextBox1.Text = System.DateTime.Now.ToString(
"D"
);
//2007/4/24
this
.TextBox2.Text = System.DateTime.Now.ToString(
"d"
);
//2007年4月24日 16:30:15
this
.TextBox3.Text = System.DateTime.Now.ToString(
"F"
);
//2007年4月24日 16:30
this
.TextBox4.Text = System.DateTime.Now.ToString(
"f"
);
//2007/4/24 16:30:15
this
.TextBox5.Text = System.DateTime.Now.ToString(
"G"
);
//2007/4/24 16:30
this
.TextBox6.Text = System.DateTime.Now.ToString(
"g"
);
//16:30:15
this
.TextBox7.Text = System.DateTime.Now.ToString(
"T"
);
//16:30
this
.TextBox8.Text = System.DateTime.Now.ToString(
"t"
);
//2007年4月24日 8:30:15
this
.TextBox9.Text = System.DateTime.Now.ToString(
"U"
);
//2007-04-24 16:30:15Z
this
.TextBox10.Text = System.DateTime.Now.ToString(
"u"
);
//4月24日
this
.TextBox11.Text = System.DateTime.Now.ToString(
"m"
);
this
.TextBox12.Text = System.DateTime.Now.ToString(
"M"
);
//Tue, 24 Apr 2007 16:30:15 GMT
this
.TextBox13.Text = System.DateTime.Now.ToString(
"r"
);
this
.TextBox14.Text = System.DateTime.Now.ToString(
"R"
);
//2007年4月
this
.TextBox15.Text = System.DateTime.Now.ToString(
"y"
);
this
.TextBox16.Text = System.DateTime.Now.ToString(
"Y"
);
//2007-04-24T15:52:19.1562500+08:00
this
.TextBox17.Text = System.DateTime.Now.ToString(
"o"
);
this
.TextBox18.Text = System.DateTime.Now.ToString(
"O"
);
//2007-04-24T16:30:15
this
.TextBox19.Text = System.DateTime.Now.ToString(
"s"
);
//2007-04-24 15:52:19:9889
this
.TextBox20.Text = System.DateTime.Now.ToString(
"yyyy-MM-dd HH:mm:ss:ffff"
);
//2007年04月24 15时56分48秒
this
.TextBox21.Text = System.DateTime.Now.ToString(
"yyyy年MM月dd HH时mm分ss秒"
);
//星期二, 四月 24 2007
this
.TextBox22.Text = System.DateTime.Now.ToString(
"dddd, MMMM dd yyyy"
);
//周三, 十二月 7 '11
this
.TextBox23.Text = System.DateTime.Now.ToString(
"ddd, MMM d \"'\"yy"
);
//星期二, 四月 24
this
.TextBox24.Text = System.DateTime.Now.ToString(
"dddd, MMMM dd"
);
//4/07
this
.TextBox25.Text = System.DateTime.Now.ToString(
"M/yy"
);
//07-12-11
this
.TextBox26.Text = System.DateTime.Now.ToString(
"dd-MM-yy"
);
string
[] Day =
new
string
[] {
"星期日"
,
"星期一"
,
"星期二"
,
"星期三"
,
"星期四"
,
"星期五"
,
"星期六"
};
//2011/12/6 昨天
this
.TextBox1.Text = System.DateTime.Now.AddDays(-1).ToShortDateString();
//2011/12/8 明天
this
.TextBox2.Text = DateTime.Now.AddDays(1).ToShortDateString();
//2011/12/4 本周星期天
this
.TextBox3.Text = DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString();
//2011/12/10 本周星期六
this
.TextBox4.Text = DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek)))).ToShortDateString();
//星期三 今天周几
this
.TextBox5.Text = Day[Convert.ToInt16(DateTime.Now.DayOfWeek)];
//2011/11/27 上周日
this
.TextBox6.Text = DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString();
//2011/12/3 上周六
this
.TextBox7.Text = DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) - 7).ToShortDateString();
//2011/12/11 下周日
this
.TextBox8.Text = DateTime.Now.AddDays(Convert.ToDouble((0 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString();
//2011/12/17 下周六
this
.TextBox9.Text = DateTime.Now.AddDays(Convert.ToDouble((6 - Convert.ToInt16(DateTime.Now.DayOfWeek))) + 7).ToShortDateString();
//2011-12-01 本月一号
this
.TextBox10.Text =DateTime.Now.ToString(
"yyyy-MM-01"
);
//2011/12/31 本月最后一天
this
.TextBox11.Text=DateTime.Parse(DateTime.Now.ToString(
"yyyy-MM-01"
)).AddMonths(1).AddDays(-1).ToShortDateString();
//2011/11/1 上个月一号
this
.TextBox12.Text=System.DateTime.Parse(DateTime.Now.ToString(
"yyyy-MM-01"
)).AddMonths(-1).ToShortDateString();
//2012/1/1 下个月一号
this
.TextBox13.Text=System.DateTime.Parse(DateTime.Now.ToString(
"yyyy-MM-01"
)).AddMonths(1).ToShortDateSring();