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Every Tool, In One Place
All free, all instant, no account needed. Pick one below.
Countdowns & dates
Countdown Timer
Create a shareable countdown to any date or event, with a live link you can send, embed, or add to your calendar.
What's the Next Holiday?
See which holiday is coming up next, with every upcoming holiday ranked soonest-first.
Days Between Dates
Find the exact days, weeks and months between two dates — useful for deadlines, due dates and contract terms.
Add or Subtract Days
Find the exact date a set number of days before or after a starting date, accounting for leap years automatically.
Days From Today / Ago
Find out exactly what date it will be a number of days from today, or what date it was a number of days ago.
Day of the Week
Find out what day of the week any date falls on — past, present or future, using the modern Gregorian calendar.
Week Number
Find the ISO 8601 week number for any date, following the official Monday-start, first-Thursday rule.
Week Number to Date
Convert an ISO week number back into its Monday-to-Sunday date range for any year.
Leap Year Checker
Check whether any year is a leap year, applying the full divisible-by-4/100/400 rule, not just the simplified version.
Days in a Month
Find out how many days are in any month of any year, including whether February has 28 or 29 days.
Weeks Between Dates
Find the exact number of full weeks between two dates, with the leftover days broken out.
Months Between Dates
Find the exact number of calendar months between two dates, using real month math, not days ÷ 30.
Day of Year Calculator
Find which day of the year any date falls on, and how many days are left in that year.
Quarter Calculator
Find which calendar quarter (Q1–Q4) any date falls in, plus the quarter's start and end dates.
Fiscal Quarter Calculator
Find which fiscal quarter any date falls in for a custom fiscal-year start month, not just the calendar year.
Printable Calendar
Generate a clean calendar for any month and year — print it or save it as a PDF straight from your browser.
Unix Timestamp Converter
Convert between a Unix timestamp and a readable date and time, in either direction.
Julian Date Converter
Decode a 5-digit YYDDD manufacturing or expiration code into a calendar date, or generate one from any date.
Date Format Converter
Convert any date into MM/DD/YYYY, DD/MM/YYYY, ISO 8601 and other common written formats, all at once.
Weekday Counter
Count how many Mondays, Fridays or any weekday fall between two dates, with a breakdown for all seven days at once.
Time Until
Live countdown to any time of day — today if it's still ahead, tomorrow if it's passed.
Days Until the Weekend
A live countdown to Saturday, or exactly how much weekend you have left if it's already here.
Weekends Between Dates
Count the full weekends between two dates — for planning free time, not just weekend days.
Random Date Generator
Generate a random date from within any range — for raffles, giveaways or sample data.
Season Countdown
Days until Spring, Summer, Fall and Winter, ranked soonest-first.
Wedding Countdown
A live, shareable countdown to your wedding day.
Exam Countdown
A live countdown to your exam date — see exactly how much time is left.
Retirement Countdown
Count down to your retirement date, or estimate it from your current and target age.
100th Day of School Calculator
Find the exact date of the 100th school day from your first day of school, counting weekdays only.
Age & birthdays
Age Calculator
Find your exact age in years, months and days, or your total days, weeks and hours lived.
Age Difference Calculator
Find the exact age gap between two people in years, months and days — for siblings, couples or generations.
Birthday Countdown
A live, ticking countdown to your next birthday, with the exact age you'll be turning.
Birthday Calculator
Find your next birthday's exact date, what day of the week it falls on, and the age you'll be turning.
Age in Days Calculator
See exactly how many days you've been alive, and your next 1,000-day milestone.
Age in Weeks Calculator
See exactly how many weeks old you (or your baby) are, and your next 100-week milestone.
Age in Months Calculator
See exactly how many months old you (or your baby) are, plus your next 6-month milestone.
Pregnancy Due Date Calculator
Estimate your baby's due date from the first day of your last period.
Zodiac Sign Finder
Find the Western zodiac sign, element and modality for any birth date.
Sobriety Calculator
Count exactly how many days you've been sober, and how close you are to your next milestone.
Half Birthday Calculator
Find the exact date of your half birthday — six calendar months from your date of birth.
Golden Birthday Calculator
Find your golden birthday — the year you turn the same age as the day of the month you were born.
Relationship Calculator
Find out exactly how long you've been together, and how close you are to your next milestone or anniversary.
Work & business
Business Days Calculator
Count working days between two dates, or add working days to a date, with weekends excluded automatically.
Working Hours Calculator
Calculate total working hours between two dates, based on your workday length and weekends off.
Timesheet Calculator
Add up hours worked across multiple shifts, with breaks and overnight shifts handled automatically.
Time Between Calculator
Find the exact duration between two clock times in hours and minutes, even across midnight.
Time Zone Converter
Convert a time from one time zone to another, with daylight saving time handled automatically.
World Clock
Live local time in multiple cities at once, updating every second.
Meeting Time Zone Finder
Pick a meeting time and see what it looks like across several time zones at once — built for remote teams.
Work Anniversary Calculator
Find your exact years of service and your next work anniversary, with milestone years flagged automatically.
Business Days Remaining Calculator
See how many business days are left in this month, quarter or year, starting from today.
Fun & novelty
Friday the 13th Calculator
See when the next Friday the 13th is, with a live countdown and every upcoming one listed two years out.
Palindrome Date Finder
Find the next date whose digits read the same forwards and backwards, in US, international or ISO format.
Holiday countdowns
Days Until Christmas
A live countdown to December 25, always pointing to the next upcoming Christmas.
Days Until Groundhog Day
A live countdown to February 2, when Punxsutawney Phil makes his winter forecast.
Days Until Leap Day
A live countdown to the next February 29, calculated fresh rather than assumed on a fixed 4-year cycle.
Days Until Election Day
A live countdown to the next US Election Day, the Tuesday after the first Monday in November.
Days Until Boxing Day
A live countdown to December 26, always pointing to the next upcoming Boxing Day.
Days Until New Year
A live countdown to January 1 in your own time zone, resetting automatically each year.
Days Until Halloween
A live countdown to October 31, always pointing to the next upcoming Halloween.
Days Until Valentine's Day
A live countdown to February 14, always pointing to the next upcoming Valentine's Day.
Days Until Easter
A live countdown to Easter Sunday, correctly calculated from the lunar calendar each year.
Days Until Black Friday
A live countdown to the day after Thanksgiving, updated automatically every year.
Days Until Cyber Monday
A live countdown to the Monday after Thanksgiving, updated automatically every year.
Days Until Mother's Day
Always up to date — falls on the 2nd Sunday of May in the US and most countries that observe it.
Days Until Father's Day
Always up to date — falls on the 3rd Sunday of June in the US and most countries that observe it.
Days Until Thanksgiving
A live countdown to the fourth Thursday of November — the anchor date for Black Friday and Cyber Monday.
Days Until the 4th of July
A live countdown to Independence Day, always July 4 regardless of the day of the week.
Days Until St. Patrick's Day
A live countdown to March 17, always up to date.
Days Until Daylight Saving Time
A live countdown to clocks springing forward, 2nd Sunday of March (US/Canada).
Days Until DST Ends
A live countdown to clocks falling back, 1st Sunday of November (US/Canada).
Days Until Labor Day
A live countdown to the first Monday of September (US).
Days Until Memorial Day
A live countdown to the last Monday of May (US).
Days Until Tax Day
A live countdown to the US federal tax filing deadline, correctly shifted for weekends and the Emancipation Day holiday rule.
Days Until Juneteenth
A live countdown to June 19, the federal holiday commemorating the end of slavery in the United States.
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One home for every date and time question
Each calculator below is a focused, single-purpose tool rather than a bundled app you have to dig through. If you're not sure which one you need: reach for Days Between Dates for a plain difference, Add or Subtract Days when you know a start date and a number of days, and the Countdown Timer when you want a live, shareable ticking clock to an exact moment.
Frequently asked questions
Which calculator should I use to find a deadline?
Use Add or Subtract Days if you have a start date and a number of days (e.g. a 30-day return window). Use the Countdown Timer instead if you want a live, shareable countdown to that exact deadline.
Are all these tools really free with no account?
Yes — every tool on this page is free, requires no sign-up, and keeps your input in your own browser rather than on a server.
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