@Anonymous
I made a collection like this
ClearCollect(
HolidaysCollection,
{StartDate: Date(2020,02,11)},
{StartDate: Date(2020,01,29)},
{StartDate: Date(2020,02,08)},
{StartDate: Date(2020,03,03)}
)
And then I put this code in the text property of a label
If(DateValue("02/11/2020") in HolidaysCollection.StartDate, "Holiday", "Not Holiday" )
It displayed "Holiday"
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