The trap of passing parameters through the new date () function in chrome and Firefox to get different results

One day, my colleague asked about the parameter passing through the new date () function and ran it on Firefox and Google's browser console. Different results were obtained. At first, I thought it was impossible. Later, I found this trap in actual operations.

var date = new Date(‘2014-07-25T23:00:00‘);alert(date);

In Firefox, the returned result is:

Date {Fri Jul 25 2014 23:00:00 GMT + 0800}

Firefox version (output through navigator. useragent): "Mozilla/5.0 (Windows NT 6.1; wow64; RV: 30.0) Gecko/20100101 Firefox/30.0"

Google Chrome returns the following:

Sat Jul 26 2014 07:00:00 GMT + 0800 (Chinese Standard Time)

Google browser version (output through navigator. useragent): "Mozilla/5.0 (Windows NT 6.1; wow64) applewebkit/537.36 (khtml, like gecko) Chrome/36.0.1985.125 Safari/537.36"

In comparison, Google regards the passed string as UTC time, plus 8 hours (Beijing is in GMT), and new date () calls date internally. parse ('2017-07-25t23: 00: 00z') Function

Firefox does not automatically add the local time zone. In Firefox, transfer the UTC format string and add Z (Z indicates Zulu time, which is Greenwich Mean Time ).

Of course, you can add a zero-Time Zone offset "+" to the end of the UTC string, for example, '2017-07-25t23: 00: 00 + 00: 00 '.

The running result of Firefox is as follows:

new Date(‘2014-07-25T23:00:00‘);Date {Fri Jul 25 2014 23:00:00 GMT+0800}new Date(‘2014-07-25T23:00:00Z‘);Date {Sat Jul 26 2014 07:00:00 GMT+0800}new Date(‘2014-07-25T23:00:00+00:00‘);Date {Sat Jul 26 2014 07:00:00 GMT+0800}

The running result of Google Chrome is as follows:

New Date ('2017-07-25t23: 00: 00'); sat Jul 26 2014 07:00:00 GMT + 2014 (China Standard Time) New Date ('2017-07-25t23: 00: 00z'); sat Jul 26 2014 07:00:00 GMT + 0800 (China Standard Time) New Date ('2017-07-25t23: 00: 00 + 00: 00 '); sat Jul 26 2014 07:00:00 GMT + 0800 (Chinese Standard Time)

Because you do not know when the browser adds no partition, we recommend that you write a function to convert the string to the time format:

// Converts a string to a time format. It is applicable to various browsers. The format is 2011-08-03 09: 15: 11 function gettimebytimestr (datestring) {var timearr = datestr. split (""); var d = timearr [0]. split ("-"); var T = timearr [1]. split (":"); new date (d [0], (D [1]-1), d [2], t [0], t [1], T [2]);} // converts time to string format. applicable to various browsers: function gettimestrbytime (time, stringtype) {var y = time. getfullyear (); var M = time. getmonth () + 1; var d = time. getdate (); var H = time. gethours (); var M = Date . Getminutes (); If (stringtype = 1) return y + '-' + (M <10? ('0' + M): m) + '-' + (d <10? ('0' + d): d) + "" + (H <10? ('0' + H): H) + ":" + (M <10? ('0' + M): m); Return y + '/' + (M <10? ('0' + M): m) + '/' + (d <10? ('0' + d): d) + "" + (H <10? ('0' + H): H) + ":" + (M <10? ('0' + M): m );}

In addition, common JSON format data can be extended and converted.

// Normalize the time string in JSON format into a regular string or time string, for example, "\/date (1406217600000 )\/"
Function gettimestrbyjsonstr (jsonstr) {var date = new date (parseint (sonstr. replace ("/date (",""). replace (")/", ""), 10); Return gettimestrbytime (date, 2);} // The time parameter is "July 25" function getdatetimestr (startdate, datestring) {var currenthour = datestring. split ('day') [1]; If (currenthour. indexof ("Hour ")! =-1) currenthour = currenthour. split ('time') [0]; If (currenthour = 0) currenthour = 24; var tempdate = new date (startdate. getfullyear (), startdate. getmonth (), startdate. getdate (); tempdate. settime (tempdate. gettime () + currenthour * 3600000); Return gettimestrbytime (tempdate, 2 );}