Find the day of the week for any date, count days between dates, check ISO week numbers, calculate business days, and explore all our free date tools — all built for Australia.
A date is a specific point in the Gregorian calendar identified by day, month, and year (e.g. 20 February 2026). A day is either a 24-hour period or one of the seven days of the week (Monday through Sunday). Date and day calculations — counting days between dates, finding day of the week, calculating business days — are fundamental to scheduling, legal timekeeping, financial planning, and everyday life. Australia uses the DD/MM/YYYY date format; the international standard is YYYY-MM-DD (ISO 8601).
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Count calendar days between any two dates
Count Mon–Fri working days
Add or subtract days from any date
Countdown to any future date
Find your exact age in days
ISO week number for any date
Years, months, and days breakdown
Australian public holidays 2026
Measure any date interval
Free online day counter
Count Saturdays and Sundays
Check if any year is a leap year
Advanced date and calendar maths
Step-by-step day counting guide
All date calculations on DateAndDays.com.au use the Gregorian calendar, the internationally adopted civil calendar introduced by Pope Gregory XIII in October 1582 as a refinement of the Julian calendar. It was adopted throughout the British Empire — and subsequently in Australia — in September 1752.
| Month | Days | Month | Days |
|---|---|---|---|
| January | 31 | July | 31 |
| February | 28 / 29* | August | 31 |
| March | 31 | September | 30 |
| April | 30 | October | 31 |
| May | 31 | November | 30 |
| June | 30 | December | 31 |
* February has 29 days in leap years (years divisible by 4, except century years not divisible by 400).
Australia uses the DD/MM/YYYY date format in everyday communication — for example, 20/02/2026 for 20 February 2026. This follows the day-month-year order used throughout most of the world, inherited from British conventions.
For technical and international contexts, the ISO 8601 standard (YYYY-MM-DD, e.g. 2026-02-20) is recommended to avoid ambiguity — particularly important when communicating with the United States, which uses MM/DD/YYYY.
All calculators on DateAndDays.com.au accept dates in ISO 8601 format (YYYY-MM-DD) via the date picker, ensuring accuracy regardless of locale settings.
All our date calculators are free, accurate, and work entirely in your browser. No sign-up required.
Days Between Dates →Enter your birth date in the Day of Week Finder above and click "Find Day". For example, 20 February 2026 is a Friday.
A date is a specific point in the calendar (e.g. 20 February 2026). A day is a 24-hour period or the name of a day of the week. Date calculations help measure, plan, and schedule time.
Australia inherited the day-month-year format from British convention. ISO 8601 (YYYY-MM-DD) is recommended for international or technical use to avoid ambiguity with the US MM/DD/YYYY format.
Jan: 31 · Feb: 28/29 · Mar: 31 · Apr: 30 · May: 31 · Jun: 30 · Jul: 31 · Aug: 31 · Sep: 30 · Oct: 31 · Nov: 30 · Dec: 31. Mnemonic: knuckles = 31-day months; valleys = shorter months.
365 in a standard year, 366 in a leap year. The Gregorian calendar averages 365.2425 days per year. 2026 is not a leap year.
AEST (UTC+10) for NSW, VIC, QLD, TAS, ACT; ACST (UTC+9:30) for SA and NT; AWST (UTC+8) for WA. Daylight saving is observed in NSW, VIC, SA, TAS, and ACT.