About the Date Difference Calculator
What is the Date Difference Calculator?
This date difference calculator counts the days between two dates and breaks the gap into years, months, weeks and weekdays.
Choose whether to count the end date – useful for leave, rent or project spans.
How to use the Date Difference Calculator
- Start Date (sample: 22 Oct 2026)
- End Date (sample: 30 Jan 2027)
- Count the End Date? (sample: No – days between (standard))
- Press Calculate Difference (results also refresh as you type). The result card shows the Total Days, along with In years, months, days, In weeks, In months (decimal) and Weekdays (Mon–Fri, both dates included).
Formula used
Days = End date − Start date (+ 1 if both dates are counted)
- Weekdays = Monday to Friday between the dates, both included
Worked example
These are the sample values already filled in the calculator above, and the result it returns for them:
| Input | Sample value |
|---|---|
| Start Date | 22 Oct 2026 |
| End Date | 30 Jan 2027 |
| Count the End Date? | No – days between (standard) |
| Result | Value |
|---|---|
| Total Days | 100 |
| In years, months, days | 0 years, 3 months, 8 days |
| In weeks | 14 weeks, 2 days |
| In months (decimal) | 3.29 |
| Weekdays (Mon–Fri, both dates included) | 72 |
| Hours | 2,400 |
| Direction | Forward |
Tips for using the Date Difference Calculator
- Leave applications usually count both the first and last day – choose "include both dates".
- To exclude holidays as well as weekends, use the business days calculator.