DateOverlapsQ[date1,date2]
returns True if the calendar dates date1 and date2 overlap, and False otherwise.


DateOverlapsQ
DateOverlapsQ[date1,date2]
returns True if the calendar dates date1 and date2 overlap, and False otherwise.
Details

- In DateOverlapsQ[date1,date2], both date1 and date2 should be specified as DateObject expressions of any calendar granularity.
- DateOverlapsQ accepts lists of dates in both arguments, effectively calling Outer on the input lists.
- DateOverlapsQ returns True if there is any intersection in the time period represented by date1 and date2.
Examples
open all close allBasic Examples (2)
Scope (3)
Properties & Relations (3)
DateOverlapsQ returns True if any part of the dates are overlapping:
DateWithinQ will return True only if date2 is entirely contained within date1:
If two dates overlap, their difference will be zero of the largest calendar granularity:
If two date objects overlap, they cannot be compared:

Related Guides
History
Text
Wolfram Research (2017), DateOverlapsQ, Wolfram Language function, https://reference.wolfram.com/language/ref/DateOverlapsQ.html.
CMS
Wolfram Language. 2017. "DateOverlapsQ." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/DateOverlapsQ.html.
APA
Wolfram Language. (2017). DateOverlapsQ. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DateOverlapsQ.html
BibTeX
@misc{reference.wolfram_2025_dateoverlapsq, author="Wolfram Research", title="{DateOverlapsQ}", year="2017", howpublished="\url{https://reference.wolfram.com/language/ref/DateOverlapsQ.html}", note=[Accessed: 11-August-2025]}
BibLaTeX
@online{reference.wolfram_2025_dateoverlapsq, organization={Wolfram Research}, title={DateOverlapsQ}, year={2017}, url={https://reference.wolfram.com/language/ref/DateOverlapsQ.html}, note=[Accessed: 11-August-2025]}