Make sure the Analysis ToolPak Add-in is activated.

Assuming you're starting in F2
Format - Conditional Format.
Formula is:
=F2<=EOMONTH(TODAY(),1)
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Best Regards,

Luke M
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"CP" wrote:

I want to format a Date Column

If Column F is less than any date from today + 1month

Meaning today being 2/9/09 anything in F that is less than 31/10/09

Any guidance please?