Result date: -
Day of week: -
Date Calculator
Add or subtract days from a date, or calculate the number of days between two dates.
Days Between Two Dates
Days between: -
Weeks: -
Months: -
Workdays: -
How the Date Calculator Works
The date calculator handles two common tasks: adding/subtracting time from a date, and finding the difference between two dates.
When adding months or years, the calculator preserves the day of month when possible. It correctly handles month-end dates and leap years.
Example
Adding 90 days to January 1, 2025 gives you April 1, 2025.
The difference between January 1, 2025 and December 31, 2025 is 364 days (261 workdays).
FAQ
- How are months calculated when adding?
- When adding months, the calculator moves to the same day in the target month. If that day doesn't exist (e.g., adding 1 month to January 31), it adjusts to the last valid day.
- Does this include or exclude the start/end dates?
- The days between calculation counts from the start date up to but not including the end date. This is the standard convention for date differences.
- What are workdays?
- Workdays are Monday through Friday. The calculator excludes weekends but does not account for public holidays, which vary by location.