Simple Time calculator for PDA
 

Can anyone suggest or recommend a simple time calculator for a PDA (pocket pc). All I want is something that can give the total hours after inserting a start date/time and end date/time.

A few 'lines' of Excel?

A Simple Formula for adding & subtracting hours and minutes on a caculator
 

If adding hours & minutes insert 0 between the hours and the minutes and add them up. If the figure to the right of the 0 is more than 60 continue to add 940 to it until it is less than 60. See example below:-
1058+
1030
=2088 ( 88 is more than 60 therefore add 940 to it)
940 +
=3028 3 hrs and 38 mins
If subtracting hours and minutes insert 0 between hrs and minutes and subtract. If the digits to the right of the 0 is more than 60 continue to subtract 940 from them until less than 60.
It works for me