I'm having formula and logic trouble getting a list validation formula that will force the user to enter four dates in sequential order. I have Date1, Date2, Date3, and Date4. I also need to skip a calculation if a "later" date is blank.

I would be grateful for help. Thanks-

  • Could you provide example for "skip calculation"? Are these valid entries: [09/22/2020, 09/23/2020, Blank, 09/24/2020]; [09/23/2020, Blank, 09/24/2020, Blank]? – Matiur Rahman Sep 22 '20 at 17:13
  • Hi Matiur. I am sorry for the confusion. I need the validation to only work (for example) on Date2 when Date1 has a date, or on Date3 when Date2 has a date. So, if the previous date field has a data value, the most recently filled date in the sequence gets the validation. Thank you! – ChasEpes Sep 22 '20 at 21:15
  • posted my answer. Let me know your feedback or if you have any questions – Matiur Rahman Sep 27 '20 at 18:32

Try the following formula and see if that works.


Screenshot showing valid entries

enter image description here

  • Hi Matiur: The good news is that The validation wondows accepts the code you wrote so that great! The bad news is I'm getting a "Exception from HRESULT: 0xE0040035". I am checking it with our admins but nonetheless, thank you so much. This is brilliant! – ChasEpes Sep 28 '20 at 16:25
  • Hope this works out for you. Only thing I've noticed is that you might see a syntax error when [end-date] is < [start_date] in DATEDIF(start_date,end_date,unit). But this still stops user from submitting the form. Let me know if you have any questions or need any explanation of the formula. – Matiur Rahman Sep 28 '20 at 17:18

I don't think it's possible to achieve your requirement by list validation.

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