Count calendar days.

Compare two calendar dates or move a date by a whole number of days. Date-only arithmetic avoids time-of-day and daylight-saving offsets.

EXCLUSIVE OR INCLUSIVE?

The difference shown is the number of midnight boundaries between dates: November 8 to November 9 is 1 day. If your process counts both the first and last date as included days, add 1 to the difference when the end is on or after the start.

DATE ONLY

These controls treat each input as a calendar date in the Gregorian calendar, not as an instant in a timezone. For event times that cross daylight-saving changes, use a timezone-aware calendar or timestamp tool.