Days Between Dates Calculator
How many days, weeks and business days are there between two dates?
Single calculationv1.0.0Verified 2026-11-01Runs in your browser
Spec sheet
date_diff · v1.0.0Method
Gregorian calendar day count (UTC)
- 01
days = end − start (+1 if the end date is included) - 02
business days = days that are Monday–Friday
Limits — read before relying on it
- Public holidays are not excluded from weekdays.
- Dates are calendar dates without time zones.
Sources
- ISO 8601 calendar datesstandard
Worked example
computed by the same formula2026-01-01 to 2026-12-31
Inputs
- Start date
- 2026-01-01
- End date
- 2026-12-31
- Count the end date
- No
Result
- Days
- 364
- Weeks
- 52
- Weekdays (Mon–Fri)
- 260
- Whole months
- 11
Questions
How is the days between dates calculated?
›
Gregorian calendar day count (UTC). days = end − start (+1 if the end date is included) · business days = days that are Monday–Friday
Example: 2026-01-01 to 2026-12-31?
›
Days: 364; weeks: 52.
What does this calculator not cover?
›
Public holidays are not excluded from weekdays. Dates are calendar dates without time zones.
Where do the numbers come from?
›
Sources: ISO 8601 calendar dates. The formula is versioned (date_diff v1.0.0) and covered by automated tests.
Is my data stored?
›
No. The calculation runs in your browser and nothing is sent unless you choose to save a shareable link.
Also searched asdays between dates · how many days until · date difference calculator · count days · business days between dates · how many weeks between