Change colour with date range

[Pedroble]

I would be grateful if someone could help me with this calculation for Conditional Formatting.

I have a birth control portal that gives the next birth date according to the last service.

I would like the birth date to change colour with the proximity of the event.

For days > or < my formula works but not for a range of dates eg 255-269 days

If (Birth control_HEATS::HEAT = "LAST" and GetAsNumber(Get(CurrentDate)) - GetAsNumber(Birth control_HEATS::SERV_date) = 255-269 ; 1 ; 0 )

I have tried using 255...269 and 255..269 but not accepted.

[doughemi]

If (Birth control_HEATS::HEAT = "LAST" and (Get(CurrentDate)) - (Birth control_HEATS::SERV_date) ≥ 255 and (Get(CurrentDate)) - (Birth control_HEATS::SERV_date) ≤ 269 ; 1 ; 0 )

 

The GetAsNumber() function is not needed. Internally, dates are already numbers.  Dates are stored as the number of days since Jan 1, 0001.

[Pedroble]

Thank you, that works very well.