Date Calculator
Compare two dates or add and subtract days from one date to calculate the interval or resulting date.
How to compare two dates
Select “Days between two dates,” then enter the start date followed by the end date. Enable inclusive counting only when both calendar dates belong to the period you want to count.
Total days and calendar difference
Total days measures the elapsed interval. The calendar difference splits it into full years, then full months, and finally remaining days. Approximate weeks and months are provided only as context.
Inclusive counting
One day elapses from March 1 to March 2. If both dates count as calendar days, the inclusive result is two days. This option does not change the calendar decomposition.
Leap years and month ends
February 29 is treated as a real calendar day. When shifting a date, the sequence is preserved: one day after February 28, 2024 is February 29, and one more day reaches March 1.
Add or subtract days
Select the date-offset mode, enter the base date, and then a whole number. Positive values move forward and negative values move backward. The result includes the destination date and weekday.
Limits of the calculation
The calculator counts calendar days in UTC. It does not account for times, time zones, daylight saving time, holidays, or working days. Legal deadlines may follow additional rules.