Converting time format from hh mm ss to minutes or seconds

I imported a time series in the format of HH:MM:SS from excel to matlab but it appeared as 0.4532343954 or something. How can I convert it to minutes or seconds starting zero.

The time data are in 5 seconds intervals.

Answer 1

[Star Strider]

Try this:

Tv = datetime(0.4532343954, 'Format','HH:mm:SS',  'ConvertFrom','excel')
Tv = 

  datetime

   10:52:45