Remove leading zeros from time format

Question

I am receiving a string in this format 'HH:mm:ss'. I would like to remove the leading zeros but always keeping the the last four character eg m:ss even if m would be a zero. I am formatting audio duration.

Examples:

00:03:15 => 3:15
10:10:10 => 10:10:10
00:00:00 => 0:00
04:00:00 => 4:00:00
00:42:32 => 42:32
00:00:18 => 0:18
00:00:08 => 0:08

Answer 1

You can use this replacement:

var result = yourstr.replace(/^(?:00:)?0?/, '');

demo

or better:

var result = yourstr.replace(/^0(?:0:0?)?/, '');

demo

Answer 2

You could do something like this:

var tc =['00:03:15', '10:10:10','00:00:00','04:00:00','00:42:32','00:00:18','00:00:08'];

tc.forEach(function(t) {
    var y = t.split(":");
    y[0] = y[0].replace(/^[0]+/g, '');
    if(y[0] === '') {
        y[1] = y[1].replace(/^0/g, ''); 
    }
    var r = y.filter(function(p) {return p!=='';}).join(':');
    console.log(r);
});

Divide the time in 3 parts. Remove the leading zeroes from first part, if the the first part is empty remove the leading zeroes from the second part otherwise keep it. Then join all of them discarding the empty strings.

Answer 3

Another option is to use moment.js libary.

This supports formats such as

var now = moment('1-1-1981 2:44:22').format('h:mm:ss');
alert(now);

http://jsfiddle.net/8yqxh5mo/

Answer 4

If you use 1 h instead of two you will not get the leading 0.

h:mm:ss