Days between dates
Count days, weeks and months between two dates, with or without the end date.
Free
Date and time tools
Six tools for the date and time questions that are easy to get wrong in your head: how many days until something, exactly how old someone is, what date falls 90 days from now, how many working days a deadline really leaves, what time it is in Sydney or London, and how long until an event.
The tools
Age calculator
Exact age in years, months and days, plus the next birthday.
FreeAdd or subtract days
Find the date any number of days, weeks, months or years away.
FreeWorking days calculator
Business days between dates, with NZ public holidays and anniversary days.
FreeTime zone converter
Compare New Zealand time with anywhere, daylight saving included.
FreeCountdown timer
Count down to a date and time in any zone.
Free
Which tool for which question?
"How long until…" or "how long since…" is the days between dates calculator. It answers in days, weeks, and calendar months, and lets you decide whether the end date counts. "How old is…" is the age calculator, which gives years, months and days on any date, not just today. "What date is…" 30 days, six weeks or three months from a given day is add or subtract days, which also explains what happens at the end of short months.
If a deadline is in working days, the working days calculator leaves out weekends and New Zealand public holidays (on the day a Monday-to-Friday worker gets them off), plus your regional anniversary day if you choose one. Holiday data is included for 2026 and 2027. For meetings and calls across borders, the time zone converter handles daylight saving at both ends, and the countdown timer counts down to a moment in any zone and can be shared by link.
How these tools treat dates
Date arithmetic is done in whole calendar days, so daylight saving and time zones never shift a day count. Leap years follow the Gregorian rules. Time-zone tools use the time-zone database built into your browser, so nothing is looked up online. Where a result depends on a choice, such as whether a range is inclusive or what a 29 February birthday counts as in other years, the tool asks rather than assuming, and its page explains the difference.
Privacy
Everything runs in your browser. Dates and times you type aren't sent anywhere or saved; at most, settings such as the time zones you picked are kept in the page address after the # sign so a bookmark opens the tool the same way. For printing a month or a year with holidays marked, see the printables. For the reasoning behind the answers, read the guides on counting days between two dates, working days and public holidays and time zones and daylight saving.
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