Date Calculator
Choose a starting date, enter a time amount and add or subtract it.
Calculated date
Enter a date
How this calculator works
The calculator applies years and months as calendar units, then adds or subtracts weeks and days. This keeps month lengths and leap years accurate.
Example
If you start from 1 January 2026 and add 2 months and 10 days, the calculator returns the resulting calendar date.
Frequently asked questions
Can I subtract time from a date?
Yes. Select Subtract and enter the required years, months, weeks or days.
Does it account for different month lengths?
Yes. It uses actual calendar month lengths.
Can I combine years, months, weeks and days?
Yes. You can enter values in multiple fields at the same time.