javascript - 使用 Javascript 格式化当前时间

Question

我想用 javascript 以特定格式获取当前时间。

使用下面的函数并调用它会给我 Fri Feb 01 2013 13:56:40 GMT+1300 (New Zealand Daylight Time) 但我想将其格式化为 2013 年 2 月 1 日星期五下午 2:00

var d = new Date();
var x = document.getElementById("time");
x.innerHTML = d;

当然，上面的代码没有任何格式化逻辑，但我还没有遇到任何“工作”格式化程序。

score 233 · Accepted Answer

你可能想试试

var d = new Date();
d.toLocaleString();       // -> "2/1/2013 7:37:08 AM"
d.toLocaleDateString();   // -> "2/1/2013"
d.toLocaleTimeString();  // -> "7:38:05 AM"

文档

score 191 · Accepted Answer

JavaScript Date 有几种方法允许您提取其部分：

getFullYear()- 返回 4 位数年份
getMonth()- 返回一个从零开始的整数 (0-11)，表示一年中的月份。
getDate()- 返回月份中的第几天 (1-31)。
getDay()- 返回星期几 (0-6)。0 是星期日，6 是星期六。
getHours()- 返回一天中的小时 (0-23)。
getMinutes()- 返回分钟 (0-59)。
getSeconds()- 返回第二个 (0-59)。
getMilliseconds()- 返回毫秒 (0-999)。
getTimezoneOffset()- 返回机器本地时间和 UTC 之间的分钟数。

没有内置方法可让您获取本地化字符串，如“Friday”、“February”或“PM”。你必须自己编写代码。要获得您想要的字符串，您至少需要存储日期和月份的字符串表示形式：

var months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];

然后，使用上述方法将其放在一起：

var months = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
var d = new Date();
var day = days[d.getDay()];
var hr = d.getHours();
var min = d.getMinutes();
if (min < 10) {
    min = "0" + min;
}
var ampm = "am";
if( hr > 12 ) {
    hr -= 12;
    ampm = "pm";
}
var date = d.getDate();
var month = months[d.getMonth()];
var year = d.getFullYear();
var x = document.getElementById("time");
x.innerHTML = day + " " + hr + ":" + min + ampm + " " + date + " " + month + " " + year;

<span id="time"></span>

我有一个我喜欢包含在我的标准库中的日期格式函数。它采用定义所需输出的格式字符串参数。格式字符串松散地基于.Net 自定义日期和时间格式字符串。对于您指定的格式，可以使用以下格式字符串： "dddd h:mmtt d MMM yyyy".

var d = new Date();
var x = document.getElementById("time");
x.innerHTML = formatDate(d, "dddd h:mmtt d MMM yyyy");

演示： jsfiddle.net/BNkkB/1

这是我的完整日期格式化功能：

function formatDate(date, format, utc) {
    var MMMM = ["\x00", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
    var MMM = ["\x01", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
    var dddd = ["\x02", "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
    var ddd = ["\x03", "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"];

    function ii(i, len) {
        var s = i + "";
        len = len || 2;
        while (s.length < len) s = "0" + s;
        return s;
    }

    var y = utc ? date.getUTCFullYear() : date.getFullYear();
    format = format.replace(/(^|[^\\])yyyy+/g, "$1" + y);
    format = format.replace(/(^|[^\\])yy/g, "$1" + y.toString().substr(2, 2));
    format = format.replace(/(^|[^\\])y/g, "$1" + y);

    var M = (utc ? date.getUTCMonth() : date.getMonth()) + 1;
    format = format.replace(/(^|[^\\])MMMM+/g, "$1" + MMMM[0]);
    format = format.replace(/(^|[^\\])MMM/g, "$1" + MMM[0]);
    format = format.replace(/(^|[^\\])MM/g, "$1" + ii(M));
    format = format.replace(/(^|[^\\])M/g, "$1" + M);

    var d = utc ? date.getUTCDate() : date.getDate();
    format = format.replace(/(^|[^\\])dddd+/g, "$1" + dddd[0]);
    format = format.replace(/(^|[^\\])ddd/g, "$1" + ddd[0]);
    format = format.replace(/(^|[^\\])dd/g, "$1" + ii(d));
    format = format.replace(/(^|[^\\])d/g, "$1" + d);

    var H = utc ? date.getUTCHours() : date.getHours();
    format = format.replace(/(^|[^\\])HH+/g, "$1" + ii(H));
    format = format.replace(/(^|[^\\])H/g, "$1" + H);

    var h = H > 12 ? H - 12 : H == 0 ? 12 : H;
    format = format.replace(/(^|[^\\])hh+/g, "$1" + ii(h));
    format = format.replace(/(^|[^\\])h/g, "$1" + h);

    var m = utc ? date.getUTCMinutes() : date.getMinutes();
    format = format.replace(/(^|[^\\])mm+/g, "$1" + ii(m));
    format = format.replace(/(^|[^\\])m/g, "$1" + m);

    var s = utc ? date.getUTCSeconds() : date.getSeconds();
    format = format.replace(/(^|[^\\])ss+/g, "$1" + ii(s));
    format = format.replace(/(^|[^\\])s/g, "$1" + s);

    var f = utc ? date.getUTCMilliseconds() : date.getMilliseconds();
    format = format.replace(/(^|[^\\])fff+/g, "$1" + ii(f, 3));
    f = Math.round(f / 10);
    format = format.replace(/(^|[^\\])ff/g, "$1" + ii(f));
    f = Math.round(f / 10);
    format = format.replace(/(^|[^\\])f/g, "$1" + f);

    var T = H < 12 ? "AM" : "PM";
    format = format.replace(/(^|[^\\])TT+/g, "$1" + T);
    format = format.replace(/(^|[^\\])T/g, "$1" + T.charAt(0));

    var t = T.toLowerCase();
    format = format.replace(/(^|[^\\])tt+/g, "$1" + t);
    format = format.replace(/(^|[^\\])t/g, "$1" + t.charAt(0));

    var tz = -date.getTimezoneOffset();
    var K = utc || !tz ? "Z" : tz > 0 ? "+" : "-";
    if (!utc) {
        tz = Math.abs(tz);
        var tzHrs = Math.floor(tz / 60);
        var tzMin = tz % 60;
        K += ii(tzHrs) + ":" + ii(tzMin);
    }
    format = format.replace(/(^|[^\\])K/g, "$1" + K);

    var day = (utc ? date.getUTCDay() : date.getDay()) + 1;
    format = format.replace(new RegExp(dddd[0], "g"), dddd[day]);
    format = format.replace(new RegExp(ddd[0], "g"), ddd[day]);

    format = format.replace(new RegExp(MMMM[0], "g"), MMMM[M]);
    format = format.replace(new RegExp(MMM[0], "g"), MMM[M]);

    format = format.replace(/\\(.)/g, "$1");

    return format;
};

score 51 · Accepted Answer

2017 更新：使用toLocaleDateString和toLocaleTimeString来格式化日期和时间。传递给这些方法的第一个参数是语言环境值，例如en-us。第二个参数（如果存在）指定格式选项，例如工作日的长格式。

let date = new Date();  
let options = {  
    weekday: "long", year: "numeric", month: "short",  
    day: "numeric", hour: "2-digit", minute: "2-digit"  
};  

console.log(date.toLocaleTimeString("en-us", options));

输出：2017 年 10 月 25 日，星期三，晚上 8:19

请参阅以下链接了解更多详情。

日期和时间字符串 (JavaScript)

score 17 · Accepted Answer

您可以使用我的strftime端口：

/* Port of strftime(). Compatibility notes:
 *
 * %c - formatted string is slightly different
 * %D - not implemented (use "%m/%d/%y" or "%d/%m/%y")
 * %e - space is not added
 * %E - not implemented
 * %h - not implemented (use "%b")
 * %k - space is not added
 * %n - not implemented (use "\n")
 * %O - not implemented
 * %r - not implemented (use "%I:%M:%S %p")
 * %R - not implemented (use "%H:%M")
 * %t - not implemented (use "\t")
 * %T - not implemented (use "%H:%M:%S")
 * %U - not implemented
 * %W - not implemented
 * %+ - not implemented
 * %% - not implemented (use "%")
 *
 * strftime() reference:
 * http://man7.org/linux/man-pages/man3/strftime.3.html
 *
 * Day of year (%j) code based on Joe Orost's answer:
 * http://stackoverflow.com/questions/8619879/javascript-calculate-the-day-of-the-year-1-366
 *
 * Week number (%V) code based on Taco van den Broek's prototype:
 * http://techblog.procurios.nl/k/news/view/33796/14863/calculate-iso-8601-week-and-year-in-javascript.html
 */
function strftime(sFormat, date) {
  if (!(date instanceof Date)) date = new Date();
  var nDay = date.getDay(),
    nDate = date.getDate(),
    nMonth = date.getMonth(),
    nYear = date.getFullYear(),
    nHour = date.getHours(),
    aDays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
    aMonths = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
    aDayCount = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334],
    isLeapYear = function() {
      if ((nYear&3)!==0) return false;
      return nYear%100!==0 || nYear%400===0;
    },
    getThursday = function() {
      var target = new Date(date);
      target.setDate(nDate - ((nDay+6)%7) + 3);
      return target;
    },
    zeroPad = function(nNum, nPad) {
      return ('' + (Math.pow(10, nPad) + nNum)).slice(1);
    };
  return sFormat.replace(/%[a-z]/gi, function(sMatch) {
    return {
      '%a': aDays[nDay].slice(0,3),
      '%A': aDays[nDay],
      '%b': aMonths[nMonth].slice(0,3),
      '%B': aMonths[nMonth],
      '%c': date.toUTCString(),
      '%C': Math.floor(nYear/100),
      '%d': zeroPad(nDate, 2),
      '%e': nDate,
      '%F': date.toISOString().slice(0,10),
      '%G': getThursday().getFullYear(),
      '%g': ('' + getThursday().getFullYear()).slice(2),
      '%H': zeroPad(nHour, 2),
      '%I': zeroPad((nHour+11)%12 + 1, 2),
      '%j': zeroPad(aDayCount[nMonth] + nDate + ((nMonth>1 && isLeapYear()) ? 1 : 0), 3),
      '%k': '' + nHour,
      '%l': (nHour+11)%12 + 1,
      '%m': zeroPad(nMonth + 1, 2),
      '%M': zeroPad(date.getMinutes(), 2),
      '%p': (nHour<12) ? 'AM' : 'PM',
      '%P': (nHour<12) ? 'am' : 'pm',
      '%s': Math.round(date.getTime()/1000),
      '%S': zeroPad(date.getSeconds(), 2),
      '%u': nDay || 7,
      '%V': (function() {
              var target = getThursday(),
                n1stThu = target.valueOf();
              target.setMonth(0, 1);
              var nJan1 = target.getDay();
              if (nJan1!==4) target.setMonth(0, 1 + ((4-nJan1)+7)%7);
              return zeroPad(1 + Math.ceil((n1stThu-target)/604800000), 2);
            })(),
      '%w': '' + nDay,
      '%x': date.toLocaleDateString(),
      '%X': date.toLocaleTimeString(),
      '%y': ('' + nYear).slice(2),
      '%Y': nYear,
      '%z': date.toTimeString().replace(/.+GMT([+-]\d+).+/, '$1'),
      '%Z': date.toTimeString().replace(/.+\((.+?)\)$/, '$1')
    }[sMatch] || sMatch;
  });
}

示例用法：

// Returns "Thursday 4:45pm 15 Sep 2016"
strftime('%A %l:%M%P %e %b %Y');

// You can optionally pass it a Date object
// Returns "Friday 2:00pm 1 Feb 2013"
strftime('%A %l:%M%P %e %b %Y', new Date('Feb 1, 2013 2:00 PM'));

最新代码可在此处获得：https ://github.com/thdoan/strftime

score 6 · Accepted Answer

查看 Date 类的内部结构，您会发现可以提取所有位（日期、月份、年份、小时等）。

http://www.w3schools.com/jsref/jsref_obj_date.asp

对于类似Fri 23:00 1 Feb 2013代码的东西是这样的：

date = new Date();

weekdayNames = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
var dateString = weekdayNames[date.getDay()] + " " 
    + date.getHours() + ":" + ("00" + date.getMinutes()).slice(-2) + " " 
    + date.getDate() + " " + monthNames[date.getMonth()] + " " + date.getFullYear();

console.log(dateString);

**** 于 2019-05-29 修改，以保持 3 名反对者满意

score 5 · Accepted Answer

有很多很棒的图书馆，对于那些感兴趣的人

这些天真的不需要发明自己的格式说明符。

score 4 · Accepted Answer

使用时刻。

我不能足够推荐使用Moment。如果您能够使用第三方库，我强烈建议您这样做。除了格式化之外，它还可以非常好地处理时区、解析、持续时间和时间旅行，并将在简单性和时间上带来好处（以较小的大小、抽象和性能为代价）。

用法

你想要看起来像这样的东西：

2013 年 2 月 1 日星期五下午 2:00

好吧，有了 Moment，您需要做的就是：

import Moment from "moment";

Moment().format( "dddd h:mma D MMM YYYY" ); //=> "Wednesday 9:20am 9 Dec 2020"

如果您想匹配确切的日期和时间，您需要做的就是：

import Moment from "moment";

Moment( "2013-2-1 14:00:00" ).format( "dddd h:mma D MMM YYYY" ) ); //=> "Friday 2:00pm 1 Feb 2013"

在这里可以找到无数其他格式选项。

安装

转到他们的主页以查看更详细的说明，但如果您使用的是 npm 或 yarn，则非常简单：

npm install moment --save

或者

yarn add moment

score 2 · Accepted Answer

d = Date.now();
d = new Date(d);
d = (d.getMonth()+1)+'/'+d.getDate()+'/'+d.getFullYear()+' '+(d.getHours() > 12 ? d.getHours() - 12 : d.getHours())+':'+d.getMinutes()+' '+(d.getHours() >= 12 ? "PM" : "AM");

console.log(d);

score 2 · Accepted Answer

对于这种真正的 mysql 风格，请使用以下函数：2019/02/28 15:33:12

如果您单击
下方的“运行代码片段”按钮
它将向您展示一个简单的实时数字时钟示例该演示将出现在代码片段下方。

function getDateTime() {
        var now     = new Date(); 
        var year    = now.getFullYear();
        var month   = now.getMonth()+1; 
        var day     = now.getDate();
        var hour    = now.getHours();
        var minute  = now.getMinutes();
        var second  = now.getSeconds(); 
        if(month.toString().length == 1) {
             month = '0'+month;
        }
        if(day.toString().length == 1) {
             day = '0'+day;
        }   
        if(hour.toString().length == 1) {
             hour = '0'+hour;
        }
        if(minute.toString().length == 1) {
             minute = '0'+minute;
        }
        if(second.toString().length == 1) {
             second = '0'+second;
        }   
        var dateTime = year+'/'+month+'/'+day+' '+hour+':'+minute+':'+second;   
         return dateTime;
    }

    // example usage: realtime clock
    setInterval(function(){
        currentTime = getDateTime();
        document.getElementById("digital-clock").innerHTML = currentTime;
    }, 1000);

<div id="digital-clock"></div>

score 2 · Accepted Answer

只有时间

const getTime = ()=>{
    const d = new Date();
    const dd = [d.getHours(), d.getMinutes(), d.getSeconds()].map((a)=>(a < 10 ? '0' + a : a));
    return dd.join(':');
};

score 1 · Accepted Answer

2.39KB 缩小。一份文件。https://github.com/rhroyston/clock-js

当前时间是

var str = clock.month;
var m = str.charAt(0).toUpperCase() + str.slice(1,3); //gets you abbreviated month
clock.weekday + ' ' + clock.time + ' ' + clock.day + ' ' + m + ' ' + clock.year; //"tuesday 5:50 PM 3 May 2016"

score 1 · Accepted Answer

function formatTime(date){

  d = new Date(date);
  var h=d.getHours(),m=d.getMinutes(),l="AM";
  if(h > 12){
    h = h - 12;
  }
  if(h < 10){
    h = '0'+h;
  }
  if(m < 10){
    m = '0'+m;
  }
  if(d.getHours() >= 12){
    l="PM"
  }else{
    l="AM"
  }

  return h+':'+m+' '+l;

}

用法和结果：

var formattedTime=formatTime(new Date('2020 15:00'));
// Output: "03:00 PM"

score 0 · Accepted Answer

要使用基础 Date 类，您可以查看MDN的方法（由于这个原因，而不是 W3Schools ）。在那里，您可以找到有关用于访问每个日期/时间组件的每种方法的良好描述，以及与方法是否被弃用相关的信息。

否则，您可以查看Moment.js，它是一个用于日期和时间处理的好库。您可以使用它来操作日期和时间（例如解析、格式化、i18n 等）。

score -3 · Accepted Answer

function startTime() {
    var today = new Date(),
        h = checkTime(((today.getHours() + 11) % 12 + 1)),
        m = checkTime(today.getMinutes()),
        s = checkTime(today.getSeconds());
    document.getElementById('demo').innerHTML = h + ":" + m + ":" + s;
    t = setTimeout(function () {
        startTime()
    }, 500);
}
startTime();

})();

05:12:00

score -10 · Accepted Answer

-10

let date = new Date();
let time = date.format("hh:ss")

于 2019-09-27T09:23:09.123 回答

javascript - 使用 Javascript 格式化当前时间

15 回答 15

使用时刻。

用法

安装

Related

Reference