Days Calculator Australia
Count the days between two dates, add or subtract days, and run the day counts that matter to the ATO: the CGT 12-month test, the residency presence count and your amendment deadline.
Awaiting input
Choose a calculation, then enter the dates.
What this estimate includes
- Counts days between two dates with a switch for inclusive or exclusive counting, plus weeks and weekdays.
- Adds or subtracts any number of days and shows the weekday of the result.
- Tests the CGT discount holding period by calendar anniversary, not a day count, so leap years cannot flip the result.
- Derives the residency day threshold from the actual length of the income year.
- Works from calendar dates only, so time zones and daylight saving cannot shift a result.
Frequently asked questions
How many days are there between two dates?
Enter a start and end date. By default the start date is not counted, so 1 January to 2 January is 1 day. Switch to inclusive counting to include both dates, which makes it 2 days.
How does the ATO count 12 months for the CGT discount?
You exclude the day of acquisition and the day of the CGT event when working out whether you owned the asset for at least 12 months. An asset bought on 1 January 2025 therefore qualifies for a CGT event from 2 January 2026, and a sale on 1 January 2026 does not. For a property sale the CGT event is usually the contract date, not settlement.
Is the 183-day residency test always 183 days?
The Act says more than one-half of the year of income. In a 365-day income year that is 183 days, but an income year containing 29 February has 366 days and needs 184. The test also falls away if your usual place of abode is outside Australia and you do not intend to take up residence here.
How long do I have to amend my tax return?
Individuals generally have 2 years from the day after the notice of assessment is sent. Sole traders have 4 years for the 2024–25 income year and later, and 2 years for 2023–24 and earlier. After that you may need to lodge an objection instead.
Does the weekday count remove public holidays?
No. Weekdays are Monday to Friday only. Public holidays differ by state and territory, so subtract any that apply to you.
Does the calculator depend on my time zone?
No. It counts calendar dates only, so daylight saving changes and the time zone of your device cannot move a result by a day.
Tax Accuracy & Sources
Tax year: Current ATO day-count rules
Day counts only, not tax advice. It does not decide whether an asset qualifies for the CGT discount, whether you are a resident under any test, or whether the ATO will accept an amendment. A 29 February start date rolls to 1 March in the next common year. Public holidays are not removed from weekday counts.
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