How to calculate a date field in Numbers I'm using a date field as a conditional element. If cell A1 which is date field is empty (no date has been entered yet), then leave the cell A2 blank. If there is a date entered into A1, run a calculation (which I already have). 

Thanks
There is an IsEmpty() function in Numbers for this, so the formula probably will look something like

=if(IsEmpty(CELL-REFERENCE),"",YOUR-FORMULA)