如何在JavaScript中获取当前日期?
当前回答
这个答案适用于那些想要一个类似ISO-8601-格式和时区的日期的人。
对于那些不想包含任何日期库的人来说,这是纯JavaScript。
var date = new Date();
var timeZone = date.toString();
// Get timezone ('GMT+0200')
var timeZoneIndex = timeZone.indexOf('GMT');
// Cut optional string after timezone ('(heure de Paris)')
var optionalTimeZoneIndex = timeZone.indexOf('(');
if(optionalTimeZoneIndex != -1){
timeZone = timeZone.substring(timeZoneIndex, optionalTimeZoneIndex);
}
else{
timeZone = timeZone.substring(timeZoneIndex);
}
// Get date with JSON format ('2019-01-23T16:28:27.000Z')
var formattedDate = new Date(date.getTime() - (date.getTimezoneOffset() * 60000)).toJSON();
// Cut ms
formattedDate = formattedDate.substring(0,formattedDate.indexOf('.'));
// Add timezone
formattedDate = formattedDate + ' ' + timeZone;
console.log(formattedDate);
在控制台中打印以下内容:
2019-01-23 17:12:52 GMT+0100
JSFiddle:https://jsfiddle.net/n9mszhjc/4/
其他回答
更清洁、更简单的版本:
new Date().toLocaleString();
结果因用户的语言环境而异:
2017年2月27日上午9:15:41
使用new Date()生成包含当前日期和时间的新Date对象。
var today=新日期();var dd=字符串(today.getDate()).padStart(2,'0');var mm=字符串(today.getMonth()+1).padStart(2,'0')//一月是0!var yyyy=today.getFullYear();今天=mm+'/'+dd+'/'+yyyy;document.write(今天);
这将以mm/dd/yyyy的格式显示今天的日期。
只需更改今天=mm+'/'+dd+'/'+yyyy;按照您希望的格式。
如果您希望格式化为字符串。
statusUpdate = "time " + new Date(Date.now()).toLocaleTimeString();
输出:“时间11:30:53 AM”
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;
} ());
使用JavaScript内置的Date.pr原型.toLocaleDateString()(MDN文档中有更多选项):
常量选项={月份:'2-位',天:'2位数',年份:'数字',};console.log(newDate().toLocaleDateString('en-US',选项));//年/月/日
我们可以使用具有良好浏览器支持的Intl.DateTimeFormat获得类似的行为。与toLocaleDateString()类似,我们可以传递带有选项的对象:
const date = new Date('Dec 2, 2021') // Thu Dec 16 2021 15:49:39 GMT-0600
const options = {
day: '2-digit',
month: '2-digit',
year: 'numeric',
}
new Intl.DateTimeFormat('en-US', options).format(date) // '12/02/2021'