Date calculators
Nine free tools for the questions our pages do not cover. They run in your browser and keep nothing on our servers.
Counted from Tuesday, November 3, 2026. Updated every night.
Pick a calculator
All calculators
Days between dates
Count the days, weeks, months and work days between two dates. Tick the box to include the end date.
Open the calculatorHours calculator
Find the hours and minutes between two times or two dates, in decimal hours too. It works across midnight.
Open the hours calculatorTime calculator
Add or subtract hours, minutes and seconds, or add up a list of times with the working shown.
Open the time calculatorAdd or subtract days
Start from a date and move forward or back by days, weeks, months or years. Useful for deadlines and notice periods.
Open the date calculatorBusiness days calculator
Count work days between two dates, with the public holidays of the US, UK, Canada or Australia taken out.
Open the business days toolWeekday counter
Count any weekday, or any set of weekdays, between two dates. Good for rotas, classes and paydays.
Open the weekday counterWhat day was I born
Enter a birth date to see the weekday, your age in days and the day your next birthday falls on.
Find the weekdayCountdown
Pick any date and time to get a live countdown, a shareable link and one line of code for your site.
Make a countdownCountdown widget
Put a live countdown on your own site. Pick an event, one of seven styles and a colour, then copy one line of code.
Build a widgetWhich tool answers which question
| Question | Use | Answer shape |
|---|---|---|
| How many days from Nov 3 to December 25? | Days between dates | Days, weeks, months |
| How many hours from 9:15 AM to 5:40 PM? | Hours calculator | Hours, minutes, seconds |
| What is 2:45 plus 1:30? | Time calculator | A time and a total |
| What is the date 90 days from today? | Add or subtract days | A date |
| How many work days in a month? | Business days | A count |
| How many Tuesdays until June? | Weekday counter | A count and a list |
| What weekday was I born on? | What day was I born | A weekday and an age |
| How long until our event? | Countdown | A live timer |
How the tools work
Every calculator runs in your browser. The dates you enter never leave your device, and we do not store them.
Each tool uses the same counting rules as the rest of the site. Whole days are counted from the start date, and the end date is left out unless you tick the box.
Results have their own web address, so you can copy a link and send it to a colleague. Those result pages are not indexed by search engines.
Include the end date or not
Most countdowns leave the end date out. A hotel stay from December 24 to 27 is 3 nights, not 4.
Leave and rentals work the other way. Monday to Thursday is 4 days off if you count both ends.
Each tool has a switch for this, and the result card says which rule it used.
Public holidays and work days
The business days tool takes out national public holidays for the country you pick. It does not know about state, provincial or company holidays.
Dates come from official sources, which each country page lists. Where a holiday moves to a Monday, the observed day is the one removed.
If your workplace closes on other days, use the weekday counter and subtract them by hand.
Examples of what people calculate
People use these tools for notice periods, visa stays, return windows and project deadlines. Others use them for how long they have been together or how old they are in days.
A landlord might count 60 days from a notice. A student might count the weekdays left before an exam. Both fit in the tools above.
Limits of the tools
The tools use the Gregorian calendar and cover dates from 1900 to 2100. Outside that range the answers may be wrong, so we show a notice instead. Dates before 1900 can also differ between sources, so check any result that matters.
Choosing the right calculator
If you want a number of days between two points, start with days between dates. If you want a date, start with add or subtract days.
For work, the business days tool is the one to use, since it removes weekends and public holidays. The weekday counter handles odd schedules, such as only Tuesdays and Thursdays.
The countdown tool is for events. It gives you a link and a line of code that shows a live timer on any page.
Privacy and sharing
The calculators do their work in your browser. We do not receive the dates you type, and there is no account to create.
Sharing a result copies a link with the dates in it. Anyone who opens it sees the same answer, and search engines are told to skip it.
Questions people ask
Are the tools free?
Yes. They are free to use, with no sign-up. The site is paid for by advertising.
Do you save the dates I enter?
No. Calculations happen in your browser. Your time zone and any reminders you create are kept on your device only.
Can I share a result?
Yes. Use the copy link button. The link rebuilds the same result for anyone who opens it.
Which countries are covered for holidays?
The US, the UK, Canada and Australia. Pick the country on the business days tool to take its national holidays out.