Date Calculator Australia
Use our free date calculator to find the exact number of days between two dates, or add and subtract days from any date. Handy for visa processing times, lease renewals, probation periods and the 183-day ATO tax residency test.
Date Calculator Australia
Calculate days between two dates, or add and subtract days from any date. Includes Australian tax-relevant presets like the 183-day residency test.
Common calculations
• The calculator counts days from the start date to the end date, not including the start date itself (Monday to Friday = 4 days).
• 183 days is the ATO tax residency test threshold used to determine if you are an Australian resident for tax purposes.
How to Calculate the Number of Days Between Two Dates
To work out how many days are between two dates, simply enter the start date and end date in the calculator above. The tool counts the days from the start date to the end date, excluding the start date itself — so Monday to Friday is 4 days.
For example, from 1 July 2026 to 30 June 2027 is 364 days, which is exactly one financial year (minus the first day). This is the convention used by date calculators and Australian visa processing.
Add or Subtract Days From a Date
Need to know a date 90 days from now? Select Add days, keep today's date as the start date and enter 90. The calculator shows you the exact resulting date. The Subtract days mode works the same way backwards.
The 183-Day Tax Residency Test (ATO)
The 183-day rule is one of the ATO's primary tests for working out whether you are an Australian resident for tax purposes. If you have been in Australia for more than half the financial year (183 days), you will generally be considered a resident for tax purposes — even if you are on a temporary visa.
Use the calculator to count from the day you arrived to today, or to any date in the financial year. Reaching 183 days means your worldwide income becomes assessable in Australia and you can claim the tax-free threshold. If you spend less than 183 days in Australia, the "domicile" and "usual place of abode" tests determine your residency.
Common Date Calculations
- 90 days from today — standard notice period and common visa processing time.
- 183 days from today — the ATO tax residency test threshold.
- 12 weeks from today — typical probation period for new employees.
- 28 days from today — standard rental or employment notice period.
- 6 months from today — lease renewals and project deadlines.
- 365 days from today — annual contract renewals.
Days, Weeks and Months Between Dates
The calculator also breaks the period down into weeks, months and years, plus the number of weekdays (Monday–Friday) and weekend days. This is useful when planning a project, counting business days for a tender, or working out how many working days are left in a quarter.
Frequently Asked Questions
How do I calculate the number of days between two dates?
Select "Days between dates" mode, enter your start and end date, and the calculator shows the exact number of days, weeks, months, weekdays and weekend days between them.
Does the calculator include the start and end dates?
The calculator counts days from the start date to the end date, not including the start date itself. For example, Monday to Friday = 4 days.
How do I find a date 90 days from today?
Select "Add days" mode, keep today's date as the start date, type 90 in the days field, and the calculator shows the exact date 90 days from now.
What is the 183-day rule in Australia?
The 183-day rule is an ATO tax residency test: if you are present in Australia for more than half the income year (183 days), you are generally considered an Australian resident for tax purposes.
Is there a working days calculator?
This date calculator counts all calendar days including weekends and holidays. For business days only (excluding weekends and public holidays), see a dedicated working days calculator.
How many days in a financial year?
The Australian financial year runs 1 July to 30 June - 365 days (366 in a leap year). From 1 July to 30 June is 364 days when you exclude the start date, using this calculator's convention.