Adding or subtracting time to a field value

J

Johan

I have a form which contains a date and time field set to display the current
date and time when the form is completed. there is a second field (drop down
list ) where the user selects one of 3 different time zones.

I need to have a third field which will contain the time in a fourth time
zone calculated based on the first 2 fields.

Example,
Field 2 shows time zone Aust EST (GMT+10). the thirdt field needs to take
the first field and subtract 10 hours to give equivilant GMT time.
OR
Field 2 shows PDT (GMT-8). the third field has to add 8 hours to give GMT.

Hope this makes sense
Johan
 

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