Datediff with % off

[Artofdax]

hi, need little help with my calculation.

I would like to take 20% off Target Days

DATEDIFF(Table1[First Day)],Table1[Last Day)],DAY)<=(Table1[Target Days])

[aduguid · Accepted solution]

Try this measure 

DaysDifferenceCheck =
DATEDIFF(Table1[First Day], Table1[Last Day], DAY) <= (Table1[Target Days] * 0.8)

[Artofdax]

Thank you