Hi namedujour
Assuming your data that you want apply the conditional formatting to, is in column A.
Select the column or the range of cells you wish to apply the formatting. Home tab > Conditional Formatting > New rule > Use a formula etc > Use the formula below in the box "Format values where this formula is true: > Apply the required formatting > OK
=AND($A1<>"",$A1<DATE(YEAR(TODAY())-1,MONTH(TODAY()),DAY(TODAY())))
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