Apply filter to data item with interval data type

[andysin]

I subtract date1 and date2 to get the difference in minutes.

However, when I put a filter if (difference > 15) then (1) else (0)... it does not allow me to do it.

Seeking if there is another or better to do this..

[andysin]

I managed to do it but if there is any better way then it will be good to know.

minutes(date1) - minutes(date2) = difference

if (difference > 15) then (1) else (0)