Format the time with JavaScript (JS)

Formatting time with js is an indispensable Javascript class library in Web projects. It can help you solve many client programming problems quickly. Below is a method for formatting time with js.

Date.prototype.format = function(format)    {        var o = {        "M+" : this.getMonth()+1, //month        "d+" : this.getDate(),    //day        "h+" : this.getHours(),   //hour        "m+" : this.getMinutes(), //minute        "s+" : this.getSeconds(), //second        "q+" : Math.floor((this.getMonth()+3)/3),  //quarter        "S" : this.getMilliseconds() //millisecond        }        if(/(y+)/.test(format)) format=format.replace(RegExp.$1,        (this.getFullYear()+"").substr(4 - RegExp.$1.length));        for(var k in o)if(new RegExp("("+ k +")").test(format))        format = format.replace(RegExp.$1,        RegExp.$1.length==1 ? o[k] :        ("00"+ o[k]).substr((""+ o[k]).length));        return format;    }

The above code must be declared first and then used. Usage:

var d = new Date().format('yyyy-MM-dd');

Another method:

In Javascript, the Date object is Date. How do I output a Date object in a custom format?
We can tell you that the Date object has four built-in methods for output in string format:
1) toGMTString: display a date in GMT format
2) toLocaleString: display a date in the Local Operating System Format
3) toLocaleDateString: display the date part of a date object in local format
4) toLocaleTimeString: display the time part of a date object in local format
Although the Date object in Javascript provides built-in methods to output these strings, these strings are not controlled by us. Therefore, if we need to customize a special format, so what should we do?
In a rush, jsjava built a dedicated class, dedicated to the daily entry pattern of the serial output, you can download jsjava-2.0.zip, introduce the src/jsjava/text/DateFormat. js, or directly introduce jslib/jsjava-2.0.js, the sample code is as follows:

Var df = new SimpleDateFormat (); // The DateFormat object is required for jsJava1.0. Do not make a mistake. applyPattern ("yyyy-MM-dd HH: mm: ss"); var date = new Date (2007,3, 30,10, 59,51); var str = df. format (date); document. write (str); // The result is: 10:59:51

Through the above example, you can see that what you need to do is to specify the pattern. What does yyyy and MM in pattern mean? If you have learned how to format dates in Java, you should know that all placeholders have special functions. For example, y indicates year and yyyy indicates year of four numbers, for example, 1982, the following lists some special characters and their meanings supported by pattern (the following table is derived from the official Java documentation and has been modified as appropriate ):

G  Era designator  [url=]Text[/url]  AD  y  Year  [url=]Year[/url]  1996; 96  M  Month in year  [url=]Month[/url]  July; Jul; 07  w  Week in year  [url=]Number[/url]  27  W  Week in month  [url=]Number[/url]  2  D  Day in year  [url=]Number[/url]  189  d  Day in month  [url=]Number[/url]  10  F  Day of week in month  [url=]Number[/url]  2  E  Day in week  [url=]Text[/url]  Tuesday; Tue  a  Am/pm marker  [url=]Text[/url]  PM  H  Hour in day (0-23)  [url=]Number[/url]  0  k  Hour in day (1-24)  [url=]Number[/url]  24  K  Hour in am/pm (0-11)  [url=]Number[/url]  0  h  Hour in am/pm (1-12)  [url=]Number[/url]  12  m  Minute in hour  [url=]Number[/url]  30  s  Second in minute  [url=]Number[/url]  55  S  Millisecond  [url=]Number[/url]  978

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