JavaScript date output
By default, JavaScript will use the browser's time zone and date is displayed as full-text string:
Tue Apr 02 2019 09:01:19 GMT + 0800 (China Standard Time)
Create a Date object
Date object by the new () constructor to create a Date.
There are four ways to create a new target date:
- new Date()
- new Date(year, month, day, hours, minutes, seconds, milliseconds)
- new Date(milliseconds)
- new Date(date string)
new Date()
new Date () Creates a new date object with the current date and time:
Examples
var d = new Date();
Date objects are static. Computer time is ticking, but the date is not the object.
new Date(year, month, ...)
new Date (year, month, ... ) to create a new date object with the specified date and time.
7 Digital specify the year, month, day, hour, minute, seconds and milliseconds (in this order):
Examples
var d = new Date(2018, 11, 24, 10, 33, 30, 0);
Notes : JavaScript is calculated from January 0-11.
January is 0. December 11.
6 digit year, month, day, hour, minute, second:
Examples
var d = new Date(2018, 11, 24, 10, 33, 30);
5 digit year, month, day, hour and minute:
Examples
var d = new Date(2018, 11, 24, 10, 33);
4 digit year, month, day and hour:
Examples
var d = new Date(2018, 11, 24, 10);
3 numbers specify the year, month and day:
Examples
var d = new Date(2018, 11, 24);
2 number specifies the month and year:
Examples
var d = new Date(2018, 11);
You can not omit the month. If only one parameter, it is considered milliseconds.
var d = new Date(2018);
Date objects are static. Computer time is ticking, but the date is not the object.
new Date(year, month, ...)
new Date (year, month, ... ) to create a new date object with the specified date and time.
7 Digital specify the year, month, day, hour, minute, seconds and milliseconds (in this order):
Examples
var d = new Date(2018, 11, 24, 10, 33, 30, 0);
new Date(dateString)
new Date (dateString) to create a new date object from a date string:
Examples
var d = new Date("October 13, 2014 11:13:00");
JavaScript 将日期存储为毫秒
JavaScript 将日期存储为自 1970 年 1 月 1 日 00:00:00 UTC（协调世界时）以来的毫秒数。
零时间是 1970 年 1 月 1 日 00:00:00 UTC。
现在的时间是：1970 年 1 月 1 日之后的 1554166879383 毫秒。
new Date(milliseconds)
new Date(milliseconds) 创建一个零时加毫秒的新日期对象：
实例
var d = new Date(0);
1970年 1 月 1 日加上100 000 000 000毫秒，大约是 1973 年 3 月 3 日：
实例
var d = new Date(100000000000);
1970 年 1 月 1 日减去 100 000 000 000 毫秒大约是 1966 年 10 月 31 日：
实例
var d = new Date(-100000000000);
日期方法
创建 Date 对象时，可以使用许多方法对其进行操作。
日期方法允许您使用本地时间或 UTC（通用或 GMT）时间来获取和设置日期对象的年、月、日、小时、分钟、秒和毫秒。
显示日期
JavaScript（默认情况下）将以全文本字符串格式输出日期：
Wed Mar 25 2015 08:00:00 GMT+0800 (中国标准时间)
在 HTML 中显示日期对象时，会使用 toString() 方法自动转换为字符串。
实例
d = new Date(); document.getElementById("demo").innerHTML = d;
等同于：
d = new Date(); document.getElementById("demo").innerHTML = d.toString();
toUTCString() 方法将日期转换为 UTC 字符串（一种日期显示标准）。
实例
var d = new Date(); document.getElementById("demo").innerHTML = d.toUTCString();
toDateString() 方法将日期转换为更易读的格式：
实例
var d = new Date(); document.getElementById("demo").innerHTML = d.toDateString();
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