Convert time from 24 hours format to HH:MM

I am trying to convert time in the 24 hour format to HH:MM. I require this to write with the title in a figure. For example, time now reads as 12.5 and i need to write this as 12:30. can somebody help me?

Answer 1

[Walter Roberson]

sprintf('%02d:%02d', floor(T), floor(60 * mod(T,1)) )

[Sreeja]

Thanks a lot..it worked!!!!

[Walter Roberson]

It has problems with leap seconds.