Date Calculator

This date calculator moves a calendar date by a whole number of days. The start date is one you pick, so the count does not have to begin today. A positive count steps forward and a negative count steps backward. The result names the weekday.

When the offset should start from today, use the Days From Today Calculator or the Days Ago Calculator instead of typing today’s date here.

A signed day count, not a clock time

The offset is a whole number of midnights. 45 means forty-five calendar days, and −10 means ten calendar days earlier. Hours and minutes are not part of this page. The result stays on the Gregorian calendar, including the extra day in a leap-year February.

Weekends inside the span

A second line says whether a Saturday or Sunday falls inside the span. That note does not skip those days. It only tells you the range is not a Monday-to-Friday run. To count weekdays and skip weekends, use the business-days tool instead of a raw day count.

Worked example: 13 November 2026 plus 45 and minus 10

Start on 13 November 2026 and add 45 days. The result is Monday, 2026-12-28, and the span includes a Saturday or Sunday. The same start minus 10 days is Tuesday, 2026-11-03.

\[ 2026\text{-}11\text{-}13+45\,\mathrm{d} \]

Frequently asked questions

References

• Wikipedia — Calendar date

Assumptions and limitations

The offset is a whole number of calendar days. This page does not skip weekends or holidays, and it does not convert time zones.