Date-to-date calculator

Days between dates

Count the distance between two Gregorian calendar dates. Weekdays mean Monday through Friday and do not exclude holidays.

Excluding the start date

150,021 days

From Thursday, December 10, 1615 to Monday, September 7, 2026.

Monday–Friday weekdays107,157
Weeks and days21,431w 4d
Calendar span410 years, 8 months, 28 days

Standard mode excludes the earlier endpoint and includes the later endpoint. Reversed inputs keep the same absolute counts and are identified above.