I have 2 columns inside my list:-

  1. [Live/Active Date]. of type Date.
  2. [Contract Length (month)] . of type number, which does not allow decimals.

now based on the above 2 fields, i want to calculate the expiry date, by adding the contract length in month to the live/active date. so i created a calculated column with this formula:-

=DATE(YEAR([Live/Active Date]),(MONTH([Live/Active Date])+[Contract Length (month)]),DAY([Live/Active Date]))

this will work if both fields [Live/Active Date] & [Contract Length (month)] do have values, but if one of them or both of them are null then instead of getting null calculated result, i will get weird results. For example if the [live/Active date] is null while [Contract Length (month)] = 12, i was expecting to get null for the calculated field, while i got this 30/12/3800!! . i am searching for a solution to have my calculated column = null, if any of the 2 fields involved in the formula are null. i do not want to use defualt values or set the fields as required. so is there a way to fix this?


1 Answer 1


A null or empty date is typically treated as 12/31/1899.

Try something like this:

=IF( OR(ISBLANK([Live/Active Date] ), ISBLANK([Contract Length (month)]) ),
"missing data", yourEquationHere )

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