Dates & Time
Date Calculator
Count time between two dates or add and subtract days, weeks, months and years.
Time between dates
0 days
- Weeks
- 0 weeks, 0 days
- Calendar difference
- 0 years, 0 months, 0 days
How to use the Date Calculator
- Choose a date calculation.
- Enter the starting date and required values.
- Read the resulting date or elapsed time.
How it works
Date-only values are calculated consistently without time-of-day or daylight-saving offsets.
Formula
Difference = end date − start date
Example
January 1 to March 1, 2026 is 59 days.
Common uses
- Project deadlines
- Countdowns
- Contract and billing dates