Date Calculator
Calculate days between dates or add/subtract days from a date.
Days between two calendar dates, or a date plus/minus a number of days. Age from date of birth is the age calculator. Duration of a work shift is the hours/timesheet tools.
Formula
Day count is the difference between calendar dates. Whether both endpoints are included depends on the mode on the page.
How to calculate
- Pick start and end dates, or a start date and an offset in days.
- Read the day count (and weeks/months if shown).
- For “how old am I”, use the age calculator instead.
Example
From 1 Jan 2026 to 1 Feb 2026 is 31 days.
Common mistake
Inclusive vs exclusive counting differs by one day. Business-day counts skip weekends; this page is calendar days unless it says otherwise.
FAQ
How do I calculate days between two dates?
Enter a start and end date. This is the usual day-to-day or date-to-date calculator.
Is this an age calculator?
No. Age needs years, months, and days from a date of birth — use the age calculator.