DateWithinQ

DateWithinQ[date₁,date₂]

returns True if the calendar date date₂ is entirely contained within date₁, and False otherwise.

Details

In DateWithinQ[date₁, date₂], both date₁ and date₂ should be specified as DateObject expressions of any calendar granularity.
DateWithinQ accepts lists of dates in both arguments, effectively calling Outer on the input lists.
DateWithinQ returns True only if date₂ falls entirely within the period represented by date₁.

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Now falls within Today:

But it does not fall within Yesterday:

Test whether a given date is within the year 2022:

Test whether a date is within several dates:

Test whether several dates are within a given date:

Test for containment of several dates within several other dates:

DateWithinQ will return True only if date₂ is entirely contained within date₁:

DateOverlapsQ can be used to test for partial containment:

If a date object is within another, their difference will be zero of the largest calendar granularity:

If a date object is within another, they cannot be compared because they overlap:

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