Calculate past or future target dates by adding or subtracting years, months, weeks, and days simultaneously.
Working with calendar mathematics can get complicated, especially when tracking corporate deadlines or regulatory schedules. Our **Add/Subtract Days Calculator** makes date operations straightforward by allowing you to add or subtract multiple time intervals—years, months, weeks, and days—simultaneously. If you need to find the absolute number of calendar days between two milestones, check our Date Difference Calculator, or track exact work hours with the Work Hours Calculator.
When managing contracts or shipping deadlines, calculations often require excluding weekends. A calendar week consists of 7 consecutive days, whereas business days are standard working days (typically Monday through Friday). By toggling the Exclude Weekends switch, our tool skips Saturdays and Sundays, stepping day-by-day to find the correct business date. For more detail on working schedules, use our Business Days Calculator.
To learn more about time standards and calendar rules, see the Wikipedia ISO 8601 Date Standard.