Find a date a few days, weeks, months or years from where you start.
Examples & helpAdding months or years keeps the day of the month when possible. If that day does not exist, we use the last day of the new month: 31 January plus one month becomes 28 February in a non-leap year. A week means seven calendar days. Business days and holidays are not included.
Find a date before or after a starting date without counting through a calendar by hand. Choose days or weeks for a fixed number of calendar days. Choose months or years when you mean a calendar anniversary.
February has no 31st. The calculator uses the last valid day of the destination month, which is February 29 in this leap year. Adding a month is different from adding 30 days.
There is no February 29 in 2025, so calendar arithmetic clamps this result to February 28. For an age calculation that lets you choose March 1 instead, use My age.
No. Calendar months have different lengths. Starting on January 31, moving by one month reaches the end of February, while moving by 30 days can reach March.
No. Days and weeks include every calendar date. Use the working-day calculator for a schedule that excludes chosen weekends or holidays.
Not always. Once January 31 has been adjusted to February 28, subtracting one month from that result gives January 28. Keep the original date if you need to calculate several anniversaries from the same starting point.