How to use the date add/subtract calculator
Choose the starting date and enter the number of days. Positive values add days; negative values subtract days.
Date offset method
Every calendar day is counted, including weekends and holidays.
Example: Amara checks a 30-day deadline
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 calendar days crosses months and years automatically
A day offset follows the actual calendar, so the calculation automatically accounts for different month lengths and leap years. You do not need to manually split the offset into months and days.
Positive offsets move forward from the starting date and negative offsets move backward.
Business-day deadlines need a different rule set
This tool counts every calendar day. It does not skip Saturdays, Sundays, federal holidays, bank holidays, or organization-specific closure days.
If a contract or law defines a deadline in business days, use the relevant calendar and rule rather than treating a simple calendar-day offset as authoritative.
Assumptions and limitations
What the estimate assumes
Business days, federal holidays, settlement calendars, and jurisdiction-specific deadline rules are not excluded.
Date Add/Subtract Calculator FAQs
How do I subtract days?
Enter a negative number, such as -14.
Are weekends counted?
Yes.
Are holidays counted?
Yes.
Does the result show the weekday?
Yes.
Can I subtract days from a date?
Yes. Enter a negative day offset to move backward from the starting date.
Does adding days skip weekends?
No. The calculator adds calendar days, including weekends and holidays.
Calendar-day calculation only. Verify legal, contractual, tax, court, or business deadlines using the rules that apply to them.