Flag if Multiple Dates in Same Column

BTeeter ✭✭
edited 12/09/19 in Formulas and Functions

I'm attempting to set up conditional formatting to highlight cells if there are duplicate dates in the same column. (For a spreadsheet managing event bookings, want to highlight if multiple requests for same day)

I tried an IF/COUNTIF function in a new checkbox column but I keep getting #UNPARSEABLE.

- Column name is Mtg Date

- Formula I tried:  =IF(COUNTIF(Mtg Date:Mtg Date, Mtg Date1) >1, 1)

- Would then set up conditional formatting to highlight if box is checked

The ultimate goal is that if dates are entered that match each other I'd get a flag so that I can make sure the same room doesn't get booked. Any help?


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