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Dear LA8887,
Good day! Thank you for posting to Microsoft Community. We are happy to help you.
As per your description, it seems that you are trying to create a calculated column in SharePoint list that add the ReviewPeriod to the DateCreated.
If the understanding above is right, we've done a quick test on our side by creating ReviewPeriod as a Number column, the formula works as expected on our side, as shown below:
=DATE(YEAR(DateCreated)+ReviewPeriod,MONTH(DateCreated),DAY(DateCreated))
Meanwhile, please also check if the formula shared below can help:
=DateCreated+(ReviewPeriod*365)
Using Date and Time:
Using Date Only:
If the understanding above is not consistent with yours, please feel free to post back and point that.
Your understanding and patience will be highly appreciated. We hope that you are keeping safe and well!
Thanks for your cooperation.
Sincerely,
Rhoda | Microsoft Community Moderator
[Updated by Rhoda Zhong, 20:49 P.M., UTC+8, 7/31/2023]