Date Calculator
Days between two dates on the Gregorian calendar.
Guide: Date Calculator
Count the number of days between two dates on the Gregorian calendar. Useful for project timelines, rental periods, and travel planning. Contracts often define “business days” separately from calendar days, but plain day counts remain the backbone for notice periods, warranties, and refund windows.
Inclusive vs exclusive counting
This tool reports the difference between calendar dates. If you need inclusive “day 1” counting, add one day mentally when interpreting results.
Example intuition: from Monday to the next Monday is seven calendar-day steps if you count inclusively on both ends, but seven full rotations if you treat difference as elapsed midnight crossings—always read the tool’s definition in the UI.
Leap years
February gains a day in leap years; long spans crossing multiple Februaries need correct leap rules (Gregorian century exceptions are built into most libraries).