Add or subtract days, weeks, months or years from any date to find your target date.
It adds or subtracts days, weeks, or months from a date to find a result date.
Yes, tick working days only to skip weekends.
The calculator works for any valid calendar date.
This tool starts with one calendar date and moves forward or backward by the number of days, weeks or months you enter. It is designed for questions such as “What date is 45 days from now?”, “What was the date 12 weeks ago?” or “When does a three-month period end?” without manually stepping through a calendar.
If an invoice says payment is due 30 days after 5 September, enter 5 September as the start date, enter 30 days and choose Add. For an appointment that must be reviewed six weeks later, enter six weeks instead. If the wording says “business days”, use working-days mode, but remember that this tool skips weekends only and does not remove public holidays.
Seven days always make one week, but calendar months vary in length. Adding one month to a date therefore follows the calendar rather than adding a fixed 30 days. That difference matters around February and at the ends of 30- and 31-day months. Use the unit that matches the wording of the deadline, agreement or plan you are checking.
Working-days mode is useful for simple Monday-to-Friday planning. It does not contain a holiday calendar, so national, state, local or organisation-specific holidays are not excluded. If a formal deadline says weekends and public holidays are excluded, check those dates separately.
The result is a calendar calculation, not legal or professional advice. Notice periods, court deadlines, employment entitlements, tax due dates and contracts can have special rules about whether the starting day counts, whether the final day counts, what happens when a deadline falls on a weekend or holiday, and whether “month” means a calendar month. Confirm those rules before using the result for a formal obligation.