How to replace a string at a particular position

Question

Is there a way to replace a portion of a String at a given position in java script. For instance I want to replace 00 in the hours column with 12 in the below string.The substring comes at 13 to 15.

Mar 16, 2010 00:00 AM 

Answer 1

The following is one option:

var myString = "Mar 16, 2010 00:00 AM";

myString = myString.substring(0, 13) + 
           "12" + 
           myString.substring(15, myString.length);

Note that if you are going to use this to manipulate dates, it would be recommended to use some date manipulation methods instead, such as those in DateJS.

Answer 2

A regex approach

"Mar 16, 2010 00:00 AM".replace(/(.{13}).{2}/,"$112")
Mar 16, 2010 12:00 AM