Date Add/Subtract Calculator

Choose the starting date and enter the number of days. Positive values add days; negative values subtract days.

Every calendar day is counted, including weekends and holidays.

Amara starts on January 1, 2026 and adds 30 calendar days. The resulting date is January 31, 2026. Entering −30 instead gives December 2, 2025.

Weekends and public holidays count as normal days. If a contract specifies business days, its holiday calendar and counting rules need to be applied separately.

Adding 30 days to January 1, 2026 gives January 31, 2026. Enter -30 to move 30 calendar days before the starting date.

Calendar days include weekends and holidays. A contractual deadline or business-day schedule can use different counting rules.

Adding one day to October 31 gives November 1. Adding 30 calendar days means advancing 30 dates, including Saturdays, Sundays and holidays.

Some deadlines start counting after the triggering date or move when they fall on a holiday. This tool follows the signed number of calendar days you enter; check the counting rule for the task you are doing.