What it does
Adds a number of years, months and days to a date, or subtracts them, and shows the resulting date in Gregorian and Hijri with its weekday. Enter the date in Hijri to add Hijri months and years.
Examples
| Date | Operation | Result |
|---|---|---|
| 23 September 2026 | + 1 year, 2 months, 10 days | Friday 3 December 2027 |
| 23 September 2026 | − 90 days | Thursday 25 June 2026 |
| 1 Rajab 1447 AH | + 6 Hijri months | 1 Muharram 1448 AH (16 June 2026) |
| 31 January 2026 | + 1 month | 28 February 2026 (end of month) |
Order of operations
Years and months are added first, then days. If the day doesn’t exist in the resulting month (31 in a 30-day month, 29 February in a common year, or the 30th of a 29-day Hijri month), the last day of that month is used and the tool flags it. It’s the same rule as the Age Calculator, documented in the Methodology.
Contracts often say “one month” or “three months”, which is not the same as 30 or 90 days: three months can be 89 to 92 days. Enter the period in the unit the text uses. For working days only, use the Working Days Calculator; for the span between two known dates, use Date Difference.
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