About Date Calculator
Compare two calendar dates and shift the start date in the same workspace. Elapsed days exclude the starting day; the offset result uses Start date independently of End date. This is calendar-day arithmetic rather than a working-day or public-holiday schedule.
Signed difference
An end before the start produces a negative day count.
Independent offset
Add or subtract whole calendar days from the starting date.
UTC arithmetic
Date-only UTC values avoid local daylight-saving-hour changes in the day count.