# End of Month referencing date column

As I have combed through the solution for this with the smartsheet community resources, I however am still having issues populating the last day of the month when referencing a date column. @Paul Newcome seems like the expert in this. Halp.

• Hi @lgonzales,

A trick for this is to find the 1st date of the next month and subtract a day from it using a formula like below:

=IFERROR(DATE(YEAR([Billing Start Date]@row), MONTH([Billing Start Date]@row) + 1, 1), DATE(YEAR([Billing Start Date]@row) + 1, 1, 1)) - 1

Hope this helps! 😊

• Make sure the column you are putting the formula in is set as a date type column.

• Hi @lgonzales,

A trick for this is to find the 1st date of the next month and subtract a day from it using a formula like below:

=IFERROR(DATE(YEAR([Billing Start Date]@row), MONTH([Billing Start Date]@row) + 1, 1), DATE(YEAR([Billing Start Date]@row) + 1, 1, 1)) - 1

Hope this helps! 😊

• @lgonzales Yes. The formula that Nick has provided above is one that I have been using for quite a while to find the last day of a month. That should work for you.

• So I had tried this route and got #INVALID COLUMN VALUE - See screencap of formula that I had input, but still gives me error @Paul Newcome @Nick Korna

• Make sure the column you are putting the formula in is set as a date type column.

• The Date type did the trick. Although, I was working with a more complex formula outside of a Date column, so had to make a helper column, but figured it out! Thanks! @Paul Newcome @Nick Korna

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