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 i

Answer 1

A regex approach

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

Answer 2

One option would be

>>> var test = "Mar 16, 2010 00:00 AM";
>>> test.replace(test.substring(13,15),"12")

Answer 3

if it is always 00: in hours,

you can just replace 00: with 12:

using replace() ,

if not u need find the indexOf the : character ,

and then replace 2 digit before with 12.

Answer 4

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 5

You can direclty use replace() method along with indexOf() of string in Javascript.

Answer 6

Another creative idea could be converting into Array, splice and convert it back to String.

let str = "Mar 16, 2010 00:00 AM";
let arr = str.split("");
arr.splice(13,2,"1","2");
str = arr.join("");