Date Calculator — Days Between Dates and Add Days
Count days, weeks and months between dates, add or subtract days, and count weekdays excluding weekends.
Processed locally in your browser. Nothing is uploaded.
How to use
- Choose a mode.
- Pick dates and enter days.
- Read the difference, weekdays or target date.
Example and rules
Example: 2026-01-01 to 2026-12-31 is 364 days apart, 365 inclusive, with 261 weekdays.
- Uses calendar days, unaffected by time zones or daylight saving.
- Weekdays exclude Saturdays and Sundays only, not public holidays.
- You can choose whether to include the end date.
Frequently asked questions
What does inclusive mean?
Both the start and end dates are counted.
Are holidays supported?
Public holidays are not included; subtract them manually.
Can it calculate age?
Yes, pick the birth date and today to see years, months and days.