Core Math
Date Calculator
Calculate date differences, add or subtract days, and check the weekday for a selected date.
Example: calculate the difference from 2026-03-01 to 2026-03-19.
Result
Date difference
18
Total days: 18d
Direction: after
Weeks / days: 2w 4d
Weekday: Thursday
Dates are calculated in your browser's local time. Leap years and month lengths are included.
Online date calculator
All-in-One Calculator Date Calculator helps you find date differences, add or subtract days, and check weekdays online.