Add or subtract days from a date

Enter a start date and a number of days, weeks, months or years. The calculator returns the date that many units after or before it, with its weekday and week number.

How the date is worked out

Days and weeks are added one calendar day at a time, so the answer is the same in every time zone and across daylight saving changes. Business days skip Saturdays and Sundays; public holidays are not skipped.

Months and years keep the day of the month. When the target month is too short, the answer is that month's last day: one month after January 31 is February 28, or February 29 in a leap year. One year after February 29 is February 28.

For a ready table of common spans from today, see days from today.