Subtract Dates Calculator
Calculate the result of subtracting one date from another. Enter a start date and duration to find the end date, or enter two dates to find the duration between them.
Add/Subtract Date
Resulting Date
October 4th, 2026 11:14 PM
Subtract from a date
Formula
Add negative days, months, or years to the starting date.
Where duration is expressed as negative values for subtraction.
Worked example
Subtract 45 days from 15 August 2025:
- Start with 15 August 2025
- Subtract 45 days
- August has 31 days, so go back to 1 August = 14 days
- Remaining 31 days takes us to 1 July
- Result: 1 July 2025
And subtract 3 months from 15 August 2025:
- Start with 15 August 2025
- Go back one month: 15 July 2025
- Go back another month: 15 June 2025
- Go back the third month: 15 May 2025
- Result: 15 May 2025
How to use
- Enter the starting date
- Enter the number of days, months, and years to subtract
- Click "Calculate" to see the result
Month-end edge cases
When subtracting months from a date like 31 January, the result for February would be adjusted to the last day of February (28 or 29). This ensures the calculation always returns a valid date.
FAQ
How do I subtract business days? Use the business days calculator instead — this tool counts calendar days only.
Can I subtract time from a date? No, this tool works with dates only. Use the duration calculator to combine date and time subtraction.
How many days in a month? Most months have 30 or 31 days. February has 28 days (29 in leap years).
Is 2025 a leap year? No. The next leap year is 2028. A year is a leap year if it's divisible by 4, but not by 100 unless also by 400.