I thought it would be easy to simply add 20 minutes to a time field by;

Time ( Timetable_Hour; Timetable_Minute;"" )+20

With the calculation result being 'Time'. However, not to be. Had a look online but couldn't find anything.

Could you please point me in the right direction.

Thanks so much and have a great weekend.

Time fields hold time as seconds, so your calculation would have added 20 seconds to the time. You can add 20 minutes using one of these calculations:

Time ( Timetable_Hour; Timetable_Minute; 0 ) + 20 * 60

Time ( Timetable_Hour; Timetable_Minute; 0 ) + Time ( 0 ; 20 ; 0 )

I thought it would be easy to simply add 20 minutes to a time field by;

Time ( Timetable_Hour; Timetable_Minute;"" )+20

What are Timetable_Hour and Timetable_Minute? And where is the time field?

Adding 20 minutes to a time field is indeed easy =

Timefield + 1200

Aha. I am adding seconds, not minutes, That makes it very easy. Thanks so much and have a wonderful day!