Auto fill calculation
I have a field named "start time". I would like to have each added record automatically add 30 sec to the first start time. An example would be 1st record start time 00:01:00, 2nd record start time 00:01:30, 3rd record start time 00:02:00. The only way I can see to do this is with a calculation, but I can't seem to come up with a formula that works. Any suggestions would be great.