JavaScript Date time format Date.format function

Example

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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]: ("+ o[k]"). substr (("" + o[k]). length); return format; } The above function must be above (defined before use), otherwise the format () cannot be recognized var ddd = new Date (); Alert (Ddd.format (' yyyyMMdd '));

Look at an example Date.format

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An extension to date that converts date to a string of the specified format Months (m), days (d), hours (h), minutes (m), seconds (s), quarter (q) can be used with 1-2 placeholders, Year (y) you can use 1-4 placeholders, milliseconds (s) to use only 1 placeholders (1-3-digit digits) Example: (New Date ()). Format ("Yyyy-mm-dd hh:mm:ss. S ") ==> 2006-07-02 08:09:04.423 (New Date ()). Format ("yyyy-m-d h:m:s.s") ==> 2006-7-2 8:9:4.18 Date.prototype.Format = function (FMT) {//author:meizz var o = { "m+": This.getmonth () + 1,//month "D+": this.getdate (),//day "h+": this.gethours (),//hour "m+": this.getminutes (),//min "S+": This.getseconds (),//sec "q+": Math.floor (This.getmonth () + 3)/3),//Quarter "S": this.getmilliseconds ()//MS }; if (/(y+)/.test (FMT)) FMT = Fmt.replace (regexp.$1, (this.getfullyear () + ""). substr (4-regexp.$1.length)); For (var k in O) if (new RegExp ("+ K +")). Test (FMT) FMT = Fmt.replace (regexp.$1, (regexp.$1.length = = 1)? (O[k]): (("+ o[k]"). substr (("" + o[k). length)); return FMT; }

Example Date.prototype.format

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<span style= "FONT-SIZE:18PX;" >date.prototype.format = function (mask) { var d = this; var zeroize = function (value, length) { if (!length) length = 2; Value = String (value); for (var i = 0, zeros = '; i < (length-value.length); i++) { Zeros + = ' 0 '; } return zeros + value; }; return Mask.replace (/"[^"]* "|") [^ ']* ' |\b (?:d {1,4}|m{1,4}|yy (?: yy)? | ([HHMSTT]) \1?| [Llz]) \b/g, function ($) { Switch ($) { Case ' d ': return D.getdate (); Case ' DD ': Return Zeroize (D.getdate ()); Case ' DDD ': return [' Sun ', ' Mon ', ' Tue ', ' Wed ', ' Thr ', ' Fri ', ' Sat '][d.getday ()]; Case ' dddd ': return [' Sunday ', ' Monday ', ' Tuesday ', ' Wednesday ', ' Thursday ', ' Friday ', ' Saturday '][d.getday ()]; Case ' M ': Return D.getmonth () + 1; Case ' MM ': Return Zeroize (D.getmonth () + 1); Case ' MMM ': return [' Out of the window ', ' Feb ', ' Mar ', ' Apr ', ' may ', ' June ', ' o ', ' Aug ', ' Sep ', ' Oct ', ' Nov ', ' Dec '][d.getmonth ()]; Case ' MMMM ': return [' January ', ' February ', ' March ', ' April ', ' may ', ' June ', ' July ', ' August ', ' September ', ' October ', ' No ' Vember ', ' December '][d.getmonth ()]; Case ' yy ': Return String (D.getfullyear ()). substr (2); Case ' yyyy ': return D.getfullyear (); Case ' H ': return d.gethours ()% 12 | | 12; Case ' hh ': Return Zeroize (d.gethours ()% 12 | | 12); Case ' H ': return d.gethours (); Case ' HH ': Return Zeroize (D.gethours ()); Case ' m ': return D.getminutes (); Case ' mm ': Return Zeroize (D.getminutes ()); Case ' s ': return D.getseconds (); Case ' SS ': Return Zeroize (D.getseconds ()); Case ' l ': Return Zeroize (D.getmilliseconds (), 3); Case ' L ': var m = d.getmilliseconds (); if (M >) m = Math.Round (M/10); Return Zeroize (m); Case ' TT ': Return d.gethours () < 12? ' Am ': ' PM '; Case ' TT ': Return d.gethours () < 12? ' AM ': ' PM '; Case ' Z ': Return d.toutcstring (). Match (/[a-z]+$/); Return quoted strings with the surrounding quotes removed Default:return $0.substr (1, $0.length-2); } }); };</span>