Calendar days
Standard mode excludes the earlier date and includes the later date. Inclusive mode counts both endpoints.
Days between dates
Count the exact distance between two Gregorian calendar dates. Weekdays mean Monday through Friday and do not exclude holidays.
278,579 days
From Thursday, December 27, 1263 to Thursday, September 17, 2026.
Monday–Friday weekdays198,985
Weeks and days39,797w 0d
Calendar span762 years, 8 months, 21 days
Standard mode excludes the earlier endpoint and includes the later endpoint. Reversed inputs keep the same absolute counts and are identified above.
Counting rules
How the date difference is calculated
Weekdays
Monday through Friday are counted separately. For holiday-aware deadlines, use the business days calculator.
Related calculations
Start with today’s date, calculate an exact age, or add time to a date.