How to set the time to 24:00:00 "programmatically"

[KishoreBarik]

I have the option 24:00:00 in the dropdown selection. However I am not able to set the value to 24:00:00 programmatically on click of a button.

Note: Using v1.4.6 I can see 24:00:00 as in dropdown by using {timeFormat: 'H:i:s'} as option only