Calculate / Free tool
Calculate a future date
Add days, weeks, months or years to a starting date.
Your result
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How it works
Days are calendar days: weekends and public holidays count. When adding months or years, the day is adjusted to the last day of the target month if necessary. The calculation uses calendar dates, with no shift caused by daylight saving time.
January 31, 2025 + 1 month = February 28, 2025
Does the starting date count as day one?
No. Adding 1 day to September 10 gives September 11. Adding 0 days keeps the starting date.