title: Convert time duration like in JIRA time log #h #m #s format into 00:00:00
body: <p>I want to convert my time duration from <code>1h 20m 53s</code> into <code>01:20:53</code> format. My time duration may only have <code>20m 53s</code> or <code>25m</code> or <code>1h</code> or <code>23s</code>. I need to convert that into time format of <code>00:00:00</code>.</p>