Converting between ordinary time and decimal time is a simple question of multiplication and addition.

You start with time on the form hh:mm:ss.t and a timezone. First convert to GMT. Then do a simple:
hh * 125/3 + mm * 25/36 + ss.t * 5/432

To go the other way, first divide by 125/3 for the number of hours, divide the remainder by 25/36 for the number of minutes, and divide that remainder again by 5/432 for the number of seconds.

Or you just type in ordinary (24 hour) or decimal time in the below forms and press calculate.

Convert to decimal time
Convert from decimal time
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