js日期操作，js日期戳转日期

js日期戳转日期

function timestampToDateFormat(timestamp) {
  const dateObj = new Date(timestamp); // 创建Date对象
  const year = dateObj.getFullYear(); // 获取年份
  const month = ("0" + (dateObj.getMonth() + 1)).slice(-2); // 获取月份，并补零
  const day = ("0" + dateObj.getDate()).slice(-2); // 获取日期，并补零
  
  return `${year}-${month}-${day}`; // 返回转换后的日期格式
}

js日期戳转日期

function timestampToDateFormat(timestamp) {
  const dateObj = new Date(timestamp); // 创建Date对象
  const year = String(dateObj.getFullYear()); // 获取年份
  const month = String(dateObj.getMonth() + 1).padStart(2, "0"); // 获取月份，并补零
  const day = String(dateObj.getDate()).padStart(2, "0"); // 获取日期，并补零
 
  return year + "-" + month + "-" + day; // 返回转换后的日期格式
}

js日期戳转日期

function timestampToDateFormat(timestamp) {
  const dateObj = new Date(timestamp); // 创建Date对象
  const options = { year: 'numeric', month: '2-digit', day: '2-digit' }; // 设置日期格式选项
  const formattedDate = dateObj.toISOString().slice(0, 10); // 使用toISOString()方法获取ISO格式的日期字符串，再截取前10个字符
  const [year, month, day] = formattedDate.split("-"); // 拆分年、月、日
 
  return `${year}-${month}-${day}`; // 返回转换后的日期格式
}

其他code

获取当前日期：
var myDate = new Date();
myDate.getYear();        //获取当前年份(2位)
myDate.getFullYear();    //获取完整的年份(4位,1970-????)
myDate.getMonth();       //获取当前月份(0-11,0代表1月)
myDate.getDate();        //获取当前日(1-31)
myDate.getDay();         //获取当前星期X(0-6,0代表星期天)
myDate.getTime();        //获取当前时间(从1970.1.1开始的毫秒数)
myDate.getHours();       //获取当前小时数(0-23)
myDate.getMinutes();     //获取当前分钟数(0-59)
myDate.getSeconds();     //获取当前秒数(0-59)
myDate.getMilliseconds();    //获取当前毫秒数(0-999)
myDate.toLocaleDateString();     //获取当前日期
var mytime = myDate.toLocaleTimeString();     //获取当前时间
myDate.toLocaleString();        //获取日期与时间

操作函数：
Date.prototype.isLeapYear 判断闰年
Date.prototype.Format 日期格式化
Date.prototype.DateAdd 日期计算
Date.prototype.DateDiff 比较日期差
Date.prototype.toString 日期转字符串
Date.prototype.toArray 日期分割为数组
Date.prototype.DatePart 取日期的部分信息
Date.prototype.MaxDayOfDate 取日期所在月的最大天数
Date.prototype.WeekNumOfYear 判断日期所在年的第几周
StringToDate 字符串转日期型
IsValidDate 验证日期有效性
CheckDateTime 完整日期时间检查
daysBetween 日期天数差

js代码：
//---------------------------------------------------
// 判断闰年
//---------------------------------------------------
Date.prototype.isLeapYear = function () {
  return (0 == this.getYear() % 4 && ((this.getYear() % 100 != 0) || (this.getYear() % 400 == 0)));
}

//---------------------------------------------------
// 日期格式化
// 格式 YYYY/yyyy/YY/yy 表示年份
// MM/M 月份
// W/w 星期
// dd/DD/d/D 日期
// hh/HH/h/H 时间
// mm/m 分钟
// ss/SS/s/S 秒
//---------------------------------------------------
Date.prototype.Format = function (formatStr) {
  var str = formatStr;
  var Week = ['日', '一', '二', '三', '四', '五', '六'];

  str = str.replace(/yyyy|YYYY/, this.getFullYear());
  str = str.replace(/yy|YY/, (this.getYear() % 100) > 9 ? (this.getYear() % 100).toString() : '0' + (this.getYear() % 100));

  str = str.replace(/MM/, this.getMonth() > 9 ? this.getMonth().toString() : '0' + this.getMonth());
  str = str.replace(/M/g, this.getMonth());

  str = str.replace(/w|W/g, Week[this.getDay()]);

  str = str.replace(/dd|DD/, this.getDate() > 9 ? this.getDate().toString() : '0' + this.getDate());
  str = str.replace(/d|D/g, this.getDate());

  str = str.replace(/hh|HH/, this.getHours() > 9 ? this.getHours().toString() : '0' + this.getHours());
  str = str.replace(/h|H/g, this.getHours());
  str = str.replace(/mm/, this.getMinutes() > 9 ? this.getMinutes().toString() : '0' + this.getMinutes());
  str = str.replace(/m/g, this.getMinutes());

  str = str.replace(/ss|SS/, this.getSeconds() > 9 ? this.getSeconds().toString() : '0' + this.getSeconds());
  str = str.replace(/s|S/g, this.getSeconds());

  return str;
}

function formatDate(dt, fmt) {
  var o = {
    "M+": dt.getMonth() + 1, //月份
    "d+": dt.getDate(), //日
    "h+": dt.getHours(), //小时
    "m+": dt.getMinutes(), //分
    "s+": dt.getSeconds(), //秒
    "q+": Math.floor((dt.getMonth() + 3) / 3), //季度
    "S": dt.getMilliseconds() //毫秒
  };
  if (/(y+)/.test(fmt)) {
    fmt = fmt.replace(RegExp.$1, (dt.getFullYear() + "").substr(4 - RegExp.$1.length));
  }
  for (var k in o) {
    if (new RegExp("(" + k + ")").test(fmt)) {
      fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
    }
  }
  return fmt;
}

//+---------------------------------------------------
//| 求两个时间的天数差 日期格式为 YYYY-MM-dd
//+---------------------------------------------------
function daysBetween(DateOne, DateTwo) {
  var OneMonth = DateOne.substring(5, DateOne.lastIndexOf('-'));
  var OneDay = DateOne.substring(DateOne.length, DateOne.lastIndexOf('-') + 1);
  var OneYear = DateOne.substring(0, DateOne.indexOf('-'));

  var TwoMonth = DateTwo.substring(5, DateTwo.lastIndexOf('-'));
  var TwoDay = DateTwo.substring(DateTwo.length, DateTwo.lastIndexOf('-') + 1);
  var TwoYear = DateTwo.substring(0, DateTwo.indexOf('-'));

  var cha = ((Date.parse(OneMonth + '/' + OneDay + '/' + OneYear) - Date.parse(TwoMonth + '/' + TwoDay + '/' + TwoYear)) / 86400000);
  return Math.abs(cha);
}

//+---------------------------------------------------
//| 日期计算
//+--------------------------------------------------- 
Date.prototype.DateAdd = function (strInterval, Number) {
  var dtStr = this;
  var dtstp = Date.parse(dtStr);
  var dt = new Date(dtStr);
  switch (strInterval) {
    case 's': return new Date(dtstp + (1000 * Number));
    case 'n': return new Date(dtstp + (60000 * Number));
    case 'h': return new Date(dtstp + (3600000 * Number));
    case 'd': return new Date(dtstp + (86400000 * Number));
    case 'w': return new Date(dtstp + ((86400000 * 7) * Number));
    case 'q': return new Date(dt.getFullYear(), (dt.getMonth()) + Number * 3, dt.getDate(), dt.getHours(), dt.getMinutes(), dt.getSeconds());
    case 'm': return new Date(dt.getFullYear(), (dt.getMonth()) + Number, dt.getDate(), dt.getHours(), dt.getMinutes(), dt.getSeconds());
    case 'y': return new Date((dt.getFullYear() + Number), dt.getMonth(), dt.getDate(), dt.getHours(), dt.getMinutes(), dt.getSeconds());
  }
}

//+---------------------------------------------------
//| 比较日期差 dtEnd 格式为日期型或者有效日期格式字符串
//+---------------------------------------------------
Date.prototype.DateDiff = function (strInterval, dtEnd) {
  var dtStart = this;
  if (typeof dtEnd == 'string')//如果是字符串转换为日期型
  {
    dtEnd = StringToDate(dtEnd);
  }
  switch (strInterval) {
    case 's': return parseInt((dtEnd - dtStart) / 1000);
    case 'n': return parseInt((dtEnd - dtStart) / 60000);
    case 'h': return parseInt((dtEnd - dtStart) / 3600000);
    case 'd': return parseInt((dtEnd - dtStart) / 86400000);
    case 'w': return parseInt((dtEnd - dtStart) / (86400000 * 7));
    case 'm': return (dtEnd.getMonth() + 1) + ((dtEnd.getFullYear() - dtStart.getFullYear()) * 12) - (dtStart.getMonth() + 1);
    case 'y': return dtEnd.getFullYear() - dtStart.getFullYear();
  }
}

//+---------------------------------------------------
//| 日期输出字符串，重载了系统的toString方法
//+---------------------------------------------------
Date.prototype.toString = function (showWeek) {
  var myDate = this;
  var str = myDate.toLocaleDateString();
  if (showWeek) {
    var Week = ['日', '一', '二', '三', '四', '五', '六'];
    str += ' 星期' + Week[myDate.getDay()];
  }
  return str;
}

//+---------------------------------------------------
//| 日期合法性验证
//| 格式为：YYYY-MM-DD或YYYY/MM/DD
//+---------------------------------------------------
function IsValidDate(DateStr) {
  var sDate = DateStr.replace(/(^\s+|\s+$)/g, ''); //去两边空格;
  if (sDate == '') return true;
  //如果格式满足YYYY-(/)MM-(/)DD或YYYY-(/)M-(/)DD或YYYY-(/)M-(/)D或YYYY-(/)MM-(/)D就替换为''
  //数据库中，合法日期可以是:YYYY-MM/DD(2003-3/21),数据库会自动转换为YYYY-MM-DD格式
  var s = sDate.replace(/[\d]{ 4,4 }[\-/]{ 1 }[\d]{ 1,2 }[\-/]{ 1 }[\d]{ 1,2 }/g, '');
  if (s == '') //说明格式满足YYYY-MM-DD或YYYY-M-DD或YYYY-M-D或YYYY-MM-D
  {
    var t = new Date(sDate.replace(/\-/g, '/'));
    var ar = sDate.split(/[-/:]/);
    if (ar[0] != t.getYear() || ar[1] != t.getMonth() + 1 || ar[2] != t.getDate()) {
      //alert('错误的日期格式！格式为：YYYY-MM-DD或YYYY/MM/DD。注意闰年。');
      return false;
    }
  }
  else {
    //alert('错误的日期格式！格式为：YYYY-MM-DD或YYYY/MM/DD。注意闰年。');
    return false;
  }
  return true;
}

//+---------------------------------------------------
//| 日期时间检查
//| 格式为：YYYY-MM-DD HH:MM:SS
//+---------------------------------------------------
function CheckDateTime(str) {
  var reg = /^(\d+)-(\d{ 1,2 })-(\d{ 1,2 }) (\d{ 1,2 }):(\d{ 1,2 }):(\d{ 1,2 })$/;
  var r = str.match(reg);
  if (r == null) return false;
  r[2] = r[2] - 1;
  var d = new Date(r[1], r[2], r[3], r[4], r[5], r[6]);
  if (d.getFullYear() != r[1]) return false;
  if (d.getMonth() != r[2]) return false;
  if (d.getDate() != r[3]) return false;
  if (d.getHours() != r[4]) return false;
  if (d.getMinutes() != r[5]) return false;
  if (d.getSeconds() != r[6]) return false;
  return true;
}

//+---------------------------------------------------
//| 把日期分割成数组
//+---------------------------------------------------
Date.prototype.toArray = function () {
  var myDate = this;
  var myArray = Array();
  myArray[0] = myDate.getFullYear();
  myArray[1] = myDate.getMonth();
  myArray[2] = myDate.getDate();
  myArray[3] = myDate.getHours();
  myArray[4] = myDate.getMinutes();
  myArray[5] = myDate.getSeconds();
  return myArray;
}

//+---------------------------------------------------
//| 取得日期数据信息
//| 参数 interval 表示数据类型
//| y 年 m月 d日 w星期 ww周 h时 n分 s秒
//+---------------------------------------------------
Date.prototype.DatePart = function (interval) {
  var myDate = this;
  var partStr = '';
  var Week = ['日', '一', '二', '三', '四', '五', '六'];
  switch (interval) {
    case 'y': partStr = myDate.getFullYear(); break;
    case 'm': partStr = myDate.getMonth() + 1; break;
    case 'd': partStr = myDate.getDate(); break;
    case 'w': partStr = Week[myDate.getDay()]; break;
    case 'ww': partStr = myDate.WeekNumOfYear(); break;
    case 'h': partStr = myDate.getHours(); break;
    case 'n': partStr = myDate.getMinutes(); break;
    case 's': partStr = myDate.getSeconds(); break;
  }
  return partStr;
}

//+---------------------------------------------------
//| 取得当前日期所在月的最大天数
//+---------------------------------------------------
Date.prototype.MaxDayOfDate = function () {
  var myDate = this;
  var ary = myDate.toArray();
  var date1 = (new Date(ary[0], ary[1] + 1, 1));
  var date2 = date1.dateAdd(1, 'm', 1);
  var result = dateDiff(date1.Format('yyyy-MM-dd'), date2.Format('yyyy-MM-dd'));
  return result;
}

//+---------------------------------------------------
//| 取得当前日期所在周是一年中的第几周
//+---------------------------------------------------
Date.prototype.WeekNumOfYear = function () {
  var myDate = this;
  var ary = myDate.toArray();
  var year = ary[0];
  var month = ary[1] + 1;
  var day = ary[2];
  document.write('< script language=VBScript\> \n');
  document.write('myDate = Datue('+month+' - '+day+' - '+year+') \n');
  document.write('result = ' + DatePart('ww', myDate));
  document.write(' \n');
  return result;
}

//+---------------------------------------------------
//| 字符串转成日期类型
//| 格式 MM/dd/YYYY MM-dd-YYYY YYYY/MM/dd YYYY-MM-dd
//+---------------------------------------------------
function StringToDate(DateStr) {
  var converted = Date.parse(DateStr);
  var myDate = new Date(converted);
  if (isNaN(myDate)) {
    //var delimCahar = DateStr.indexOf('/')!=-1?'/':'-';
    var arys = DateStr.split('-');
    myDate = new Date(arys[0], --arys[1], arys[2]);
  }
  return myDate;
}

// 若要显示: 当前日期加时间(如: 2009-06-12 12:00)
function CurentTime() {
  var now = new Date();
  var year = now.getFullYear(); //年
  var month = now.getMonth() + 1; //月
  var day = now.getDate(); //日
  var hh = now.getHours(); //时
  var mm = now.getMinutes(); //分
  var clock = year + "-";

  if (month < 10)
    clock += "0";

  clock += month + "-";

  if (day < 10)
    clock += "0";

  clock += day + " ";

  if (hh < 10)
    clock += "0";

  clock += hh + ":";
  if (mm < 10) clock += '0';
  clock += mm;
  return (clock);
}
// 来源：http://www.cnblogs.com/carekee/articles/1678041.html