Calendar day difference
ordinal day of end date - ordinal day of start dateEach date is converted to an integer calendar day, so the result is not affected by local time zones.
Date calculator
Date difference calculator
Find the elapsed calendar days between two dates without relying on local time zones or daylight saving time.
Calculate a date difference
Calculation method
Examples
July 1 to July 17, 2026
start = 2026-07-01, end = 2026-07-17
result = 16 days, 2 weeks and 2 days, 384 hours
Leap day included
start = 2024-02-28, end = 2024-03-01
result = 2 days
Same date
start = 2026-07-14, end = 2026-07-14
result = 0 days
FAQ
Is the start date counted?
No. The calculator measures elapsed days, so the same start and end date gives zero days.
Does daylight saving time affect the result?
No. The calculation uses calendar day numbers, not local times or timestamps.
Can the end date be before the start date?
No. Use the swap button if the dates were entered in the opposite order.