Subtract 1 month from the date expire for a task

ClanMcDe

I have a column that calculates a due date that uses this simple formula:

=DATE(YEAR([Date Expired]@row), MONTH([Date Expired]@row) - 1, DAY([Date Expired]@row))

It works great but for some reason returns #INVALID VALUE when the date expired is any day in January. any other month seems to be fine I'm guessing because the month prior is in a prior year. what argument will fix this?

ClanMcDe

https://community.smartsheet.com/discussion/comment/454602#Comment_454602

@Paul Newcome as ussual, your insights are invaluable. Thank you for the assist!

Paul Newcome

Try this:

=IFERROR(DATE(YEAR([Date Expired]@row), MONTH([Date Expired]@row) - 1, DAY([Date Expired]@row)), DATE(YEAR([Date Expired]@row) - 1, 12, DAY([Date Expired]@row)))

ClanMcDe

https://community.smartsheet.com/discussion/comment/454602#Comment_454602

@Paul Newcome as ussual, your insights are invaluable. Thank you for the assist!

Paul Newcome

Happy to help. 👍️