Add or subtract days, weeks, months or years from any date and see the resulting calendar date, including its weekday, right away.
Find a date in the future or the past. Pick a starting date, choose Add or Subtract, enter an amount and select days, weeks, months or years. The resulting date appears immediately with its day of the week, for example Mon Oct 19 2026.
This is useful for due dates, trial periods, delivery estimates, warranty end dates or working out when something happened a set time ago. Month and year steps follow calendar rules, so adding a month keeps the same day number where possible, and when that day does not exist the date rolls over into the next month.
Because February has no 31st, the date rolls forward into early March, following standard JavaScript date rules.
No. All units count calendar days; use the date difference tool to count business days between two dates.