How to find the number of days between two dates

Steps

1. Write the start date and the end date. Here: 1 January 2026 and 25 December 2026.
2. Enter them in the date difference calculator.
3. Read the number of days: 358.
4. Read the same gap in weeks and days (51 weeks 1 day) and in months and days (11 months 24 days).
5. If you need both the first and the last day counted, add 1 to the number of days.

Whether to count the first day

The calculator counts the days after the start date up to and including the end date. 1 March to 1 June 2026 is 92 days. If you are counting days of a stay or a leave, where both the first and last days count, add 1: that is 93.

For deadlines, check whether the rule says days from a date or days including it, because the answer differs by one.

Leap years

A leap year has 366 days, because February has 29. The gap from 1 January 2024 to 1 January 2025 is 366 days, which is 1 year, 0 months and 0 days. The calculator uses the real calendar, so you never need to add leap days yourself.

Weeks, months and hours

The same gap can be shown in different units. 358 days is 51 weeks and 1 day, or 8,592 hours. Months are counted as complete calendar months, so the number of days in a month does not matter: 1 March to 1 June is exactly 3 months, even though it is 92 days. To count only the weekdays, use the working days calculator instead.