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Date Calculators & Tools

Count days between dates, add or subtract time, run countdowns, and look up week numbers — then print matching monthly or yearly calendars.

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Date tools (here) Days between, age, week numbers, deadlines Time tools Timer, stopwatch, alarm, world clock, hours Converters Unix, Excel, FILETIME, ISO 8601, cron

All date tools

Time Zone Converter Multi-city world clock — EST, PST, IST, UTC & 380+ cities Moon Phases Today's moon phase, lunar calendar, rise/set & zodiac sign Days Between Dates Count calendar days between two dates with weekday breakdown Date Duration Years/months/days between dates — time, workdays, and time zones Date Calculator Add or subtract days, weeks, months, or years Days Until Countdown to any date or upcoming holiday Business Days Workdays between dates, excluding weekends & federal holidays Days Left in Year Countdown to December 31 with day-of-year progress Days Until Month End How many days left in the current month Days Ago What date was N days before today Net 30 / 60 / 90 Invoice due dates for Net 30, 60, 90, and 120 terms When Is Easter Easter Sunday date — Computus algorithm Nth Weekday of Month Find the 1st Monday, 3rd Thursday, last Friday, etc. Today's Date Live date, day-of-year, week numbers & formats Week Number US & ISO weeks — browse every week of the year Week → Dates Convert week number to start/end date range Quarter Calculator Q1–Q4 start/end dates and days in quarter Day of the Week Find the weekday for any date Day Numbers Julian day-of-year table for any year Days in Month How many days in any month (leap-year aware) Julian Date YYDDD codes, batch decoder & day-of-year grid Age Calculator Age in years, months, and days between two dates Birthday Calculator Days until your next birthday Date of Birth from Age Reverse-calculate birth date from age Months Between Dates Years, months, and days between two dates Years Between Dates Decimal years and Y/M/D breakdown Weekday Counter Count Mon/Tue/… in a date range Recurring Dates Every N days, weeks, or months from a start date Unix Timestamp Epoch seconds ↔ human-readable date Leap Year Check if a year is a leap year and next Feb 29 Weeks Between Dates Count whole weeks and remaining days between dates Hours Between Dates Hours and minutes between two date-times Age in Seconds Special age in seconds, minutes, hours, and days Age on Date How old you were or will be on any date Age Difference Exact age gap between two people Half Birthday Find your half-birthday date Next Weekday Next or upcoming Monday\u2013Sunday from any date Previous Weekday Most recent weekday before a date Last Day of Month Last calendar day of any month First Day of Month First calendar day of any month Deadline Calculator Work backwards from a due date Doomsday Calculator Weekday via the Doomsday rule Date Pattern Calculator Interesting patterns in date formats Random Date Generator Random dates in a range and format Pregnancy Due Date Estimated due date from LMP (not medical advice) Payday Calculator Biweekly and monthly payday schedule Fiscal Year Calculator Fiscal year and quarter from any start month Date Info Weekday, week number, day-of-year, leap status Sunrise & Sunset Sunrise, sunset, and day length by location Astronomical Seasons Equinox and solstice dates by year Moon Distance Moon distance and illumination Orthodox Easter Orthodox Easter Sunday by year Chinese New Year Chinese New Year date by year Zodiac Calculator Western sun sign from date of birth Chinese Zodiac Chinese zodiac animal from birth year Dawn & Dusk Civil twilight, dawn, and dusk times Day Length Calculator Hours of daylight for a date and place First Day of Spring Vernal equinox date and UTC time by year First Day of Summer June solstice date and UTC time by year First Day of Autumn September equinox (fall) date and UTC time by year First Day of Winter December solstice date and UTC time by year Solar Noon Calculator Local solar noon (sun transit) for a city and date Longest Day of the Year Summer solstice daylight length for your city Shortest Day of the Year Winter solstice daylight length for your city Korean Age Calculator Traditional Korean age and international age Age on Other Planets Your age on Mars, Jupiter, and more Planetary Hours Classical planetary hours from sunrise Billion Seconds When you turn one billion seconds old Generation Calculator Generation label from birth year Add Business Days Add or subtract workdays, skipping weekends and US federal holidays Halfway Date Calculator Find the midpoint date between two calendar dates Day of Year Converter Convert a calendar date to its day-of-year number (1-366) and back Anniversary Calculator Years together since a date, plus the next anniversary and days until it Workdays Until Count remaining workdays until a target date, skipping weekends and US federal holidays Year Progress How far through the calendar year you are — percent and days left Leap Years List List upcoming leap years and check any year Week of the Month Which week of the month a date falls in (1st, 2nd, last…) Days Until Weekend How many days until Friday evening or Saturday Mother's Day Calculator US Mother's Day date by year (2nd Sunday in May) Father's Day Calculator US Father's Day date by year (3rd Sunday in June) Thanksgiving Date US Thanksgiving date by year (4th Thursday in November) Time Tools Online timer, stopwatch, alarm, and work-hour calculators

Popular shortcuts

30 days from today 60 days from today 90 days from today 120 days from today 180 days from today 365 days from today

30 days ago 60 days ago 90 days ago 120 days ago 180 days ago 365 days ago

Net 30 Net 60 Net 90 Net 120 Days left in 2026

Days until New Year's Day Days until MLK Day Days until Presidents' Day Days until Memorial Day Days until Juneteenth Days until Independence Day Days until Labor Day Days until Columbus Day Days until Veterans Day Days until Thanksgiving Days until Christmas Days until Halloween

The date tools hub collects free calculators that answer everyday scheduling questions: how many days between two dates, what date falls 90 days from today, how many workdays are in a contract window, and how long until the next federal holiday. Each tool links to matching printable monthly calendars and the 2026 US holidays list so you can move from a number on screen to a wall calendar or PDF.

When to use which calculator

Use the days between dates tool for total calendar days and weekday breakdowns. Use the date calculator when you need to add or subtract days, weeks, months, or years from a start date. Use business days when weekends and federal observed holidays should be excluded.

The days-until page gives live countdowns to personal deadlines or seasonal holidays when you already know the target date.

Countdown shortcuts

Days left in 2026, days until end of month, and days ago (30, 60, 90, or 120 days before today) answer common year-end and lookback questions without opening a full date calculator.

Payment terms and quarters

For vendor terms, use Net 30, Net 60, or Net 90 due-date calculators. Calendar quarters, Easter, and weekday rules live in the quarter calculator, Easter date, and nth weekday of month tools.

Age, duration, and recurring dates

Age calculators cover exact years, half birthdays, and Korean age conventions. The date duration tool measures spans in days and hours with timezone awareness when start and end times cross zones. Recurring date helpers find every nth weekday in a month — useful for rent due on the first Monday or reports due on the last Friday.

Deadline and pregnancy due-date pages sit in the same family. They share the civil calendar engine, so results align with monthly printouts when you mark the target date on a grid.

Week numbers and today's date

Today's date shows the live weekday, day-of-year, and US/ISO week numbers. 2026 week numbers lists every ISO week with Monday–Sunday ranges. The Julian date hub covers YYDDD manufacturing codes — separate from the historical Julian calendar used before the Gregorian reform.

Printable calendars after you calculate

After you know a target date, open the matching month on monthly calendars or download a 2026 yearly PDF. Federal holidays on the printout follow the same observed-date rules shown on the holidays hub.

Timers, stopwatches, and timestamp converters live on the time tools and converters hubs when your question shifts from calendar days to clock time or machine formats.

Frequently asked questions

What date calculators are free on Make a Calendar?

The date tools hub includes days between dates, add/subtract date calculator, days until countdown, business days, today's date, week number, Julian date, day-of-week lookup, and age calculator. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.

Do I need an account to use date tools?

No account is required. Calculators run in your browser and link to free printable calendars on the same site. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.

What is the difference between calendar days and business days?

Calendar days count every day on the civil calendar. Business days skip weekends and optionally US federal observed holidays. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.

Can I share a calculator result link?

Yes. Days between and date calculator pages update the URL with your inputs so you can bookmark or share the same range. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.

Where do federal holiday dates come from?

Federal holidays use legal dates with Saturday/Sunday observance moved to Friday or Monday per standard US federal rules. Always confirm edge cases against primary sources when results affect legal, medical, or financial decisions.