Days Between Dates Calculator
Count the days between two dates as days elapsed or with both dates included, plus decimal weeks and approximate months. Uses DD/MM/YYYY dates.
Your results
Calculation breakdown
- Days elapsed
- |end date − start date| in whole calendar days
- Both dates included
- Days elapsed + 1
- Weeks
- Days ÷ 7
Worked example
From 01/01/2026 to 26/01/2026 (Australia Day) is 25 days elapsed, or about 3.6 weeks. Counting both 1 January and 26 January gives 26 days.
Assumptions
- Uses each date's calendar day, which automatically accounts for leap years and daylight-saving changes.
- The order you enter the two dates doesn't matter — the result is always the absolute difference.
- Weekends and public holidays are counted like any other day.
How this calculator works
Enter a start date and end date in Australian DD/MM/YYYY format to see the total number of days between them, along with the equivalent in weeks and months. It's a quick way to check deadlines, anniversaries or how long ago something happened.
Count days between two calendar dates
By default the calculator reports the days elapsed from the start date to the end date, so 1 January to 2 January is one day. Switch the counting method to include both dates when every calendar day in the range must be counted, which adds one day.
The result also expresses the duration as decimal weeks and approximate 30.4368-day months. It includes weekends and public holidays and does not calculate business days.
Choose the right counting convention
Deadlines, accommodation bookings, age calculations and legal periods can use different inclusion rules. A hotel stay from Friday to Sunday is two nights elapsed but three calendar days, so check which convention the responsible organisation uses before relying on the count.
Dates are interpreted as calendar dates rather than elapsed 24-hour blocks, which avoids daylight-saving clock changes altering the answer. Check working-day and public-holiday rules separately.
Frequently asked questions
Can the end date be before the start date?
Yes — the calculator shows the absolute number of days apart and notes which date comes first.
Does it count leap years correctly?
Yes, the calculation uses each date's actual calendar day, which automatically accounts for leap years.
Is the start date included in the count?
By default the result is the number of days elapsed, so 1 January to 2 January is one day. Choose 'Include both the start and end date' when a rule counts both days, which adds one.
Content responsibility
Maintained by CalcAussie and last updated 15 October 2026. Checks applied: calculation method, worked examples, Australian terminology, material assumptions, official references where an external rule applies, and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.