Hi there, 

I'd like to create a formula to calculate the duration between 2 session time, but also return null if the duration is > 30 minutes (reason : these are false value, bug related, don't want to display them...)

So I tried

If('Timediff("sessionEnd","sessionStart")' > '00:30:00','null','Timediff("sessionEnd", "sessionStart")')

but I only get null result, even when duration is less than 30min.

Anyone know how to solve this ?

Cheers

Olivier