如何在JavaScript中获取当前日期？
当前回答
Try
`${Date()}`.slice(4,15)
console.log（`${Date（）}`.slice（4,15））
这里我们使用标准的JS功能：模板文本、转换为字符串的Date对象和切片。这可能是满足OP要求的最短解决方案（没有时间，只有日期）
其他回答
您可以使用moment.js：http://momentjs.com/
var m=moment（）.格式（“DD/MM/YYYY”）；文件.写入（m）；<script src=“https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.14.1/moment.min.js“></script>
您可以使用扩展Date对象的Date.js库，因此可以使用.today（）方法。
你可以使用我下面给出的DATE API，每天使用日期格式以及获取当前日期、昨天等。如何使用例如
var dt = new Date();
/// ANY DATE YOU WANT -- dt = new Date(""July 21, 1983 01:15:00"")
dateObj = dt.getFormattedDate();
alert( dateObj.isToday() );
alert( dateObj.todayDay() );
alert( dateObj.monthNameDayYear() );
(function () {
fnDateProcessor = function () {
var that = this;
return {
yyyymmdd: function (separator) {
var fdate = this.formatDate(true, true) ,
separator = separator ? separator : "-";
return fdate.year + separator + fdate.month + separator + fdate.day;
},
monthNameDayYear: function () {
var fdate = this.formatDate(true, true);
return fdate.monthName + " " + fdate.day + ", " + fdate.year;
},
ddmmyyyy: function (separator) {
var fdate = this.formatDate(true, true) ,
separator = separator ? separator : "/";
return fdate.day + separator + fdate.month + separator + fdate.year;
},
meridianTime: function () {
var fdate = this.formatDate();
return fdate.hour + ":" + fdate.minute + " " + fdate.meridian;
},
monthDay: function (separator) {
var fdate = this.formatDate();
separator = checkSeparator(separator);
return fdate.monthName.substring(0, 3) + separator + fdate.day;
},
weekMonthDayYear: function () {
var fdate = this.formatDate();
//separator = checkSeparator(separator);
return fdate.weekDay + " " + fdate.monthName.substring(0, 3) +
fdate.day + " ," + fdate.year;
},
timeZoneInclusive: function () {
return new Date(that);
},
todayDay: function () { return new Date().getDate(); },
todayMonth: function () { return new Date().getMonth() + 1; },
dateDay: function () { return this.formatDate().day; },
dateMonth: function () { return this.formatDate().month; },
isToday: function () { return this.sameDate(new Date()); },
isYesterday: function () {
d = new Date(); d.setDate(d.getDate() - 1);
return this.sameDate(d);
},
formatDate: function () {
var zeroPaddedMnth = true, zeroPaddedDay = false,
zeroPaddedHr = false, zeroPaddedMin = true;
// Possible to take Options arg that overide / merge to defaults
var monthNames = [
"January", "February", "March",
"April", "May", "June", "July",
"August", "September", "October",
"November", "December"
];
var weekDays = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
var day = getFormattedDay(that.getDate(), zeroPaddedDay);
var monthIndex = that.getMonth();
var month = getFormattedMonth(monthIndex + 1, zeroPaddedMnth);
var year = that.getFullYear();
var wkDay = that.getDay();
var hour = getFormattedHour(that.getHours(), zeroPaddedHr);
var minute = getFormattedMinute(that.getMinutes(), zeroPaddedMin);
var meridian = getMeridian(that.getHours());
return {
"day": day, "monthName": monthNames[monthIndex], "month": month,
"weekDay": weekDays[wkDay], "year": year, "hour": hour, "minute": minute,
"meridian": meridian
};
},
compareDate: function (d2) { /// validates if caller is less than argument
d2 = _isString(d2) ? new Date(d2) : d2;
return !this.sameDate(d2)
&& typeof d2 != "number"
? that < d2 : false;
},
sameDate: function (d) {
return that.getFullYear() === d.getFullYear()
&& that.getDate() === d.getDate()
&& that.getMonth() === d.getMonth();
},
dateAfter: function (separator) {
var fdate = this.formatDate();
var separator = separator ? separator : "-";
return fdate.year + separator + fdate.month + separator + (fdate.day + 1);
}
};
};
function _isString(obj) {
var toString = Object.prototype.toString;
return toString.call(obj) == '[object String]';
}
function checkSeparator(separator) {
// NOT GENERIC ... NEEDS REVISION
switch (separator) {
case " ": sep = separator; break;
case ",": sep = " ,"; break;
default:
sep = " "; break;
}
return sep;
}
function getFormattedHour(h, zeroPadded) {
h = h % 12;
h = h ? h : 12; // 12 instead of 00
return zeroPadded ? addZero(h) : h;
}
function getFormattedMinute(m, zeroPadded) {
return zeroPadded ? addZero(m) : m;
}
function getFormattedDay(dd, zeroPadded) {
return zeroPadded ? addZero(dd) : dd;
}
function getFormattedMonth(mm, zeroPadded) {
return zeroPadded ? addZero(mm) : mm;
}
function getMeridian(hr) {
return hr >= 12 ? 'PM' : 'AM';
}
function addZero(i) {
if (i < 10) {
i = "0" + i;
}
return i;
}
Date.prototype.getFormattedDate = fnDateProcessor;
} ());
如果在“当前日期”之前，你正在考虑“今天”，那么这个技巧可能对你有用：
> new Date(3600000*Math.floor(Date.now()/3600000))
2020-05-07T07:00:00.000Z
这样，您将获得时间为0:00:00的日期实例。
操作原理很简单：我们获取当前时间戳，并将其除以1天，以毫秒表示。我们会得到一个分数。通过使用Math.floor，我们去掉了分数，所以我们得到了一个整数。现在，如果我们将它乘以一天（同样是以毫秒为单位），我们会得到一个日期时间戳，时间恰好在一天的开始。
> now = Date.now()
1588837459929
> daysInMs = now/3600000
441343.73886916664
> justDays = Math.floor(daysInMs)
441343
> today = justDays*3600000
1588834800000
> new Date(today)
2020-05-07T07:00:00.000Z
干净简单。
如果您想要一个简单的DD/MM/YYYY格式，我刚刚提出了这个简单的解决方案，尽管它没有前缀缺失的零。
var d=新日期（）；document.write（[d.getDate（），d.getMonth（）+1，d.getFullYear（）].join（'/'））；
