Date Calculator
Calculate the number of days, weeks and months between two dates, or add/subtract a number of days from a date.
How to use the Date Calculator
Choose 'Difference between dates' to calculate the gap between two dates, or 'Add/Subtract days' to shift a date forward or backward.
Enter your date(s) and, for add/subtract mode, the number of days.
The result updates instantly.
Frequently Asked Questions
Frequently asked questions about the Date Calculator
Does the difference include or exclude the start date?+
The calculator counts full calendar days between the two dates (exclusive of one endpoint), which matches how most people naturally count 'days until' something.
Can I subtract days to find a past date?+
Yes, enter a negative number of days in add/subtract mode, or use the dedicated subtract option, to move backward from a date.
Does this account for leap years?+
Yes. The difference and add/subtract calculations use real calendar dates, so leap years are handled automatically and correctly.