Days, weeks or months from today

Today is day 0. One day from today is tomorrow, and seven days from today is the same weekday next week. Weeks are always seven days.

Months are calendar months, not blocks of 30 days: the day of the month stays the same and the month moves on. When that day does not exist in the month you land in, the answer is that month's last day — one month from 31 January is the end of February, never a day in March. That is also why six months from today is never exactly 180 days away: it is always between 181 and 184.

Business days are Monday to Friday, counted from tomorrow up to and including the date, less each state or territory's own public holidays that fall on a weekday. Two kinds of day are deliberately left in: a holiday that covers only part of a day, such as Queensland's Christmas Eve evening, and a holiday that applies to only part of a state, such as a show day. A state that has not yet published a year's public holidays gets no count for a range reaching into it — the table shows a dash and says why — and a holiday whose date is not yet set is named rather than guessed.

Whose clock. The page is built on Sydney time and rebuilt minutes after every Australian midnight. In your browser it switches to your own clock if you are in Australia, so a reader in Perth late in the evening gets Perth's answer, and the line under the heading says which clock was used.

A deadline in a contract, a notice or a piece of legislation may count differently — some leave out the day something was received, some count only whole "clear" days — so if a date matters, the document's own rule wins over this one.