How to make javascript Date.parse understand short years?

Question

I noticed that Date.Parse cannot handle only two digits.

Say I have it

 mm/dd/yy = 7/11/20 

The date syntax will look like this: = 7/11/1920 . Can you set it to use the two thousandth year? As if this is strange, I got a jquery ui date picker, and if you type 7/11/20 , then it turns out 2020 .

So, it would be nice if Date.Parse could hold on, I would prefer that both of them do not know what is happening, or both know what is happening, then there is one that knows and one that doesn't.

Answer 1

Not that I knew. But you can always set the year:

 YourDate="7/11/20"; DateObj=new Date(YourDate.replace(/(\d\d)$/,"20$1")); alert(DateObj); 

This code is in action.

Edit: The following code will handle both full and short years:

 YourDate="7/11/2020"; DateObj=new Date(YourDate.replace(/\/(\d\d)$/,"/20$1")); alert(DateObj); 

This code is in action.

Answer 2

So your question is, can you change the way Date.parse works so that low-double-digit dates are interpreted as dates after 2000?

Yes, it can be done, just a Date.parse shadow with your own parsing function.

 // don't do this! Date.parse = function (str) { /* your parse routine here */ } 

Of course, this is a very bad idea for shadow properties (including “methods” or function properties) of host objects, because this will lead to incorrect behavior in other scripts that expect these properties to work in a certain way.

It is also a bad idea to use double-digit dates, but this may not be under your control. If this does not go beyond your control, I would advise you to simply forget the 2-digit dates and use the value of the whole year.

Answer 3

Here is my solution:

 function parseDate(stringValue) { var date = new Date(stringValue); if (!isNaN(date.getTime())) { // if they typed the year in full then the parsed date will have the correct year, // if they only typed 2 digits, add 100 years to it so that it gets translated to this century if (stringValue.indexOf(date.getFullYear()) == -1) { date.setFullYear(date.getFullYear() + 100); } return date; } else { return null; } } 

Answer 4

How about this?

 var date = '7/11/20'; var idx = date.lastIndexOf('/') + 1; date = date.substr(0,idx) + '20' + date.substr(idx); var result = Date.parse(date);​ alert(result); 

or this version, which will first check the YYYY format.

 var date = '7/11/2020'; var idx = date.lastIndexOf('/') + 1; if(date.substr(idx).length < 4) { date = date.substr(0,idx) + '20' + date.substr(idx); } var result = Date.parse(date); alert(new Date(result))​;​