How to use it
- Choose “Days between dates” to measure a gap, or “Add / subtract” to move a date forward or back.
- Pick the dates on your phone’s calendar. The start date is already set to today, so you only change what you need.
- For a gap, tick “Include end date” if both the first and the last day should count, as with leave or notice periods.
- Read the result — total days, weeks, working days, or the new date with its weekday.
Counting days between two dates
By default the calculator counts the days from the start date to the end date, without counting the end date itself — the usual convention, so 10 March to 14 March is 4 days. Tick Include end date when both days should count (10 to 14 March inclusive is 5 days); leave applications and notice periods often work this way.
Example: from 15 August 1947 to 26 January 1950 is 895 days, or 2 years 5 months 11 days.
Working days
Working days are the Mondays to Fridays in the range. The calendar year 2026 has 365 days, of which 261 are weekdays and 104 fall on weekends. Public holidays are not removed, because they differ between states, banks and offices — subtract the ones that apply to you.
Adding or subtracting days, months and years
- Days and weeks are exact: 90 days after 1 January 2026 is 1 April 2026 (a Wednesday).
- Months and years keep the same day of the month — 15 March plus 2 months is 15 May.
- Month-end rule: if that day doesn’t exist in the new month, the result moves to the month’s last day. 31 January 2026 + 1 month = 28 February 2026, and 29 February 2024 + 1 year = 28 February 2025.
Quick reference
| Question | Answer |
|---|---|
| Days in a normal year / leap year | 365 / 366 |
| 1 Jan 2024 to 31 Dec 2024 | 365 days (366 with the end date) |
| Weekdays in January 2024 | 23 |
| 31 March 2026 − 1 month | 28 February 2026 |
Common uses
- Last working day of a notice period, or the end date of leave.
- Days left until an exam, a result or a form’s last date.
- The date a 90-day or 180-day period ends — a warranty, a return window or a document’s validity.
- How many working days a project or delivery will take.
Related tools
Need someone’s exact age, or your age on an exam cut-off date? Use the age calculator. Planning savings over a period? Try the FD or SIP calculators.