Date & Time Calculators

Work out an exact age in years, months and days on any date — plus decimal age, total months, weeks, days and hours lived, the countdown to the next birthday, the weekday you were born and upcoming day-count milestones.

Count the exact days between two dates — optionally including the end date — and see the gap in years, months and days, weeks, hours and minutes, plus working days with weekends and US, Mexican or Spanish holidays left out.

What date is 30, 60, 90 or any number of days from today? Add or subtract calendar days or business days (skipping weekends and US federal holidays) from today or any date, and see the weekday, the weeks and months it spans and a table of common day counts.

Count the weekdays (Monday–Friday) between two dates — weekends removed, holidays left in.

Count down to any date: days, weeks, months, hours, minutes and seconds left, weekdays and weekend days to go, the weekday it falls on and a milestone table. Add times for an exact hours-and-minutes countdown, or enter a past date to see how long ago it was.

Find the day of the week for any date, plus its day of the year and ISO week number.

Get the ISO week number for any date and see the exact Monday-to-Sunday range that week covers.

Count down the days to your next birthday from today or any date, see the weekday it lands on, the age you will turn, your zodiac sign and a list of your next birthdays with their weekdays.

Check whether any year is a leap year, see exactly why, and get the next three leap years.

Work out the hours, minutes and seconds between two clock times — 24-hour or AM/PM, across midnight or several days, minus a break — or add or subtract a duration to find an end or start time.

Turn hours per day, days per week and unpaid breaks into weekly paid hours — and weekly pay at your rate.

Convert a time between 50 world cities or any UTC offset on a chosen date, with daylight saving time applied, the next clock change, up to three extra cities, shared working hours and an hour-by-hour meeting planner.

Add or subtract days, weeks, months and years from any date — in calendar days or business days that skip weekends and US, Mexican or Spanish holidays — and see the exact date, weekday and a repeating schedule.

Count the full calendar months and leftover days between two dates, the months as a decimal, years-months-days, total days and weeks — with an option to include the end date, a month-end rule matching Excel’s DATEDIF, and a month-by-month table.

Find the hours and minutes between two clock times, minus any unpaid break — overnight shifts included.

Find the exact age gap between two people from birth dates, birth years or ages — in years, months and days, decimal years, months, weeks and days — plus who is older, both ages on any date, the age ratio, when one was twice the other’s age and a milestones table.

Add or subtract durations in hours, minutes and seconds (HH:MM:SS, 1h 30m or days), as many as you need, and get the total as h m s, HH:MM:SS, minutes, seconds and decimal hours, plus the end time on the clock.

Find which numbered day of the year any date is (today by default), how many days remain and how much of the year has passed — or turn a day number or a Julian date code like 26166 back into a date — with ISO week, ordinal date and Julian Day Number.

Count down to any date and time — see the days, hours and minutes remaining right now.

Count the working days left until a date, with weekends and optional US, Mexican or Spanish public holidays removed, your own days off subtracted, and working hours, work weeks and a month-by-month breakdown.

Convert decimal hours to hours-and-minutes, or hours-and-minutes back to a decimal — both directions.

Find bedtimes and wake times that fall at the end of 90-minute sleep cycles, so you wake up refreshed.

See how many days are in any month of any year — with the leap-year rule for February, working days and weekend days, how many of each weekday, hours in the month, a printable calendar and all 12 months side by side.

Find which fiscal quarter a date falls in, with the quarter’s start and end dates and how far into it you are.

Turn a birth date into an exact age in days, weeks, months and years — every unit at once, as of any date.

Count down the days, weeks and working days from today to any future date, with the full calendar breakdown.

Count the business days between two dates with weekends and US, Mexican or Spanish public holidays taken out automatically, choose which end dates count, and see working hours and a month-by-month breakdown.

Move a date forward or back by a number of working days, skipping every weekend, to land on the exact weekday.

Find the week number for any date under the ISO-8601 or US convention, with the weeks left in the year.

Find the weekday for any date in history or the future, plus which numbered weekday of the month it is.

Compare two fixed UTC offsets, see how many hours apart they are, and convert a clock time between them.

Count the working hours between two date-and-time stamps, inside your business day and skipping weekends.

Find your half birthday and big day-count milestones like your 10,000th day — with the exact weekday.

Check whether any year is a leap year, see why under the Gregorian rule, and find the next and previous ones.

Find which calendar or fiscal quarter a date is in, the quarter’s start and end dates, how far through it you are, the working days left, and a table of all four quarters of the year.

Count how many days have passed since any date, up to today or a later date: days, weeks, months, years, hours and minutes, weekdays and weekend days, leap days crossed, the next anniversary and a table of day-count milestones such as 1,000 and 10,000 days.

Add or subtract hours, minutes, seconds and days from a clock time and see the time it lands on in 12- and 24-hour form, with the day rollover, the end date and weekday, and a schedule for repeating intervals.

Subtract hours and minutes from a start time to find the earlier clock time, with previous-day rollover handled.

Add up a week of hours from a time card, split regular from overtime past 40, and see your daily average.

Enter your bedtime and get wake-up times that fall at the end of a full sleep cycle, so you wake refreshed.

Count down the days until the next major holiday, including ones that move each year like Thanksgiving.

A full breakdown of the gap between two dates — total days, years-months-days, weeks, hours, how many of each weekday, leap days, working days without US, Mexican or Spanish holidays, and a month-by-month table.

Add or subtract whole months from a date, with end-of-month clamping so Jan 31 + 1 month lands on Feb 28.

Find the exact date of, say, the 3rd Thursday of a month or the last Friday — the rule most floating holidays use.

Add or subtract any number of days from a date to find the exact calendar date and weekday it lands on.

Split total hours worked into regular and overtime past a weekly threshold, and see the 1.5× paid-hour equivalent.

Convert decimal hours like 7.75 into hours and minutes (7h 45m) for timesheets, invoices and payroll.

Enter a year and see which decade, century and millennium it belongs to — and why 2000 was still the 20th century.

Find your years of service, your next work anniversary and the countdown to it, the date of your next 5- or 10-year milestone and a list of upcoming anniversaries — or paste a team’s start dates for average tenure and everyone’s next anniversary.

Enter your birth date and target retirement age to see your retirement date and the exact countdown to it.

Count how long you have worked somewhere — years, months and days of tenure, total days, days on payroll, working days without weekends and public holidays, estimated hours, decimal years, days worked in each calendar year and your next work anniversary.

Find a contract end date from its start date and term, with the notice deadline (calendar or business days), a reminder date, auto-renewal schedule, next chance to cancel, business days in the term and time remaining.

From your last billing date and billing cycle, find your next renewal date and the countdown to it.

Find the Moon’s phase for any date and time in your time zone: the illuminated percentage, the Moon’s age, which side is lit, its distance and zodiac sign, the next new, quarter and full moons, and a day-by-day moon calendar for the month — using Meeus’s astronomical algorithms.

Estimate hours of daylight for any latitude and date using the Sun’s declination and hour angle.

Find which season a date falls in for either hemisphere — astronomical (exact equinox and solstice times for your time zone) or meteorological — with the day of the season, days left, the next season and the year’s equinox and solstice table.

Count the hours and minutes remaining until a deadline date and time — or how long ago it passed.

Add or subtract weeks (plus extra days) from any date: see the exact date and weekday, the total days, a week-by-week list, and an optional move to the next working day that skips weekends and US, Mexican, Colombian or Spanish holidays.

Count how many times a chosen weekday falls between two dates — plus a full tally of every weekday.

Compare two birth dates to find the exact age difference between two people — years, months, days and total days.

Already know how many weeks along you are? Turn your gestational age from a scan or appointment into an estimated due date, the implied last period and conception date, how far along you are today, your trimester, term dates, a milestone timeline and a week-by-week calendar — with an optional ACOG check against your last period.

Add a number of working days to a start date to find the true deadline, skipping weekends and any holidays you set aside.

See how much paid time off you earn each pay period and per year, and project your PTO balance forward in hours and days.

Convert hours and minutes to decimal hours for payroll and timesheets — and turn decimal hours back into hours and minutes.

Work an X-on / Y-off rotation? See whether a given date is a work day or a day off, where it falls in the cycle and the next changeover.

Set an alarm the right amount of time before sunrise — allow for waking, getting ready and travel so you are in place as the sun comes up.

Enter when your fast started and how long it runs to see exactly when it ends and your eating window opens and closes.

Work backwards from when you want the meal on the table — enter cook time, resting and prep to find exactly when to start.

Pick a meeting time in one time zone and see the exact local time in a second zone, including whether it falls on another day.

Find out exactly how old someone will be on a future date — in years, months and days, plus the total days between now and then.

How many days are left in the year? See the days, weeks, months, hours, weekdays and weekend days left from today or any date, the day number, the percentage of the year complete and the days left in the month and quarter, for the calendar year or any fiscal year.

Find the quarter any date falls in and its exact start and end dates — for the calendar year or a fiscal year starting in April, July or October.

Count down to New Year’s Day from any date — see exactly how many days are left until January 1, in weeks and days too.

Count down to the first day of summer, spring, autumn or winter from any date — with the exact equinox or solstice date and time in your time zone, northern or southern hemisphere, astronomical or meteorological seasons.

How many days of school are left? Count down to the last day in school days, calendar days, weekends or hours to the final bell, with days off removed, progress through the year and milestone dates like 100 and 10 days left.

Count down to your wedding day — days, weeks and months until you say “I do”, plus how far in the past a past date was.

Count down to exam day and see how much study time you have left — days until the test and total revision hours at your daily pace.

Find the Chinese zodiac animal, element and yin/yang for any birth year, plus the year that sign next comes around.

Enter a birth date to find the Western (tropical) zodiac sun sign, its date range, element, quality and ruling planet.

Find which generation a birth year belongs to — Gen Z, Millennial, Gen X, Boomer and more — with the birth-year range and current age.

Estimate how many years you may have left at your current age from the 2023 US Social Security period life table by sex, or from any life expectancy you choose, with expected age, median age, chances of reaching 80, 90 and 100, and the time left in days and weeks.

Count the days in your streak from a start date — sobriety, no-smoking, workouts or any habit — with milestones and a years-months-days breakdown.

Convert your dog’s age to human years using its breed size — small, medium, large or giant dogs age at different rates than the old “times 7” rule.

Find the next leap year after any year, check whether a year is a leap year, and see the previous leap year and the next several to come.

Turn the billable hours you log each week into an invoice total for a date range — with hours, subtotal, tax and the amount due.

Count the working days in any month and turn them into hours worked — any working week, hours per day or per week, unpaid breaks, US, Mexican or Spanish public holidays, your own days off, partial months, overtime and pay — with a week-by-week and a whole-year table.

From one known payday, map your biweekly pay schedule — the current pay period, your next payday, pay period numbers, 26- or 27-paycheck years, three-paycheck months and a full payday calendar. Also handles weekly, semimonthly and monthly pay, holidays and per-check pay.

Find your next payday on a weekly, biweekly, every-4-weeks, semimonthly or monthly schedule — the date, weekday and days and working days left, with paydays moved for weekends and bank holidays, a daily budget until payday, your last and following paydays and a calendar of upcoming paydays.

Count the whole days from the Unix epoch (January 1, 1970) to any date — the epoch day number, plus weeks and years elapsed.

Convert a Unix timestamp in seconds or milliseconds to a readable UTC date and time, with the ISO 8601 string and weekday.

Convert a date and time to a Unix (epoch) timestamp in seconds, milliseconds, microseconds and nanoseconds, in UTC or any time zone with daylight saving handled, with ISO 8601, RFC 2822, hex, the 2038 check and the same moment around the world.

Find the ISO 8601 week number, week-numbering year and weekday for any date — plus the full YYYY-Www-D week date used in business calendars.

Find the ordinal date — the day-of-year number from 1 to 366 — for any date, with days remaining and the percent of the year elapsed.

Add hours and minutes to a clock time and get the correct result when it rolls past midnight — with the day offset and 24-hour form.

Paste stopwatch lap times or cumulative splits (with hundredths) and get the average and median lap, total time, fastest and slowest laps, spread, standard deviation, first-half vs second-half split, a lap-by-lap table and chart, plus pace and speed from the lap distance.

Enter a timer length in hours, minutes and seconds and a start time to see exactly when it finishes, to the second, with the end date and a next-day flag. Or work backwards: when to start a timer to finish on time, or how long to set it between two clock times. Repeating rounds with breaks, a reminder and checkpoints included.

Turn a clock-in, clock-out and unpaid break into paid hours and pay — splitting daily regular and overtime hours at your chosen threshold and multiplier.

Track a flexitime hours balance: compare the hours you actually worked against your contracted hours for a period and carry the surplus or deficit forward.

Add up on-call pay: standby hours at a standby rate, hours actually called out at a call-out rate, and any fixed on-call allowance — for one period.

Round clock-in and clock-out punches to the nearest 15 minutes (or 6, 10, 30) and see the rounded paid hours versus the exact hours worked.

From one known fortnightly payday, list your upcoming pay dates (moved off weekends and US, Mexican, Colombian or Spanish holidays), the next quarterly pay date, paydays per month, quarter and year — including 27-payday years and three-payday months.

Find how many days into the fiscal year a date is, for any fiscal-year start month — with the day number, days remaining and percent of the year elapsed.

Find the date of the next (or last) Monday, Friday or any weekday from today or any date — the one after that too — with days and weeks away, ISO week, and a list of upcoming dates every week or every few weeks.

Count how many times a specific weekday — every Monday, Friday, or any day — falls between two dates, inclusive of both ends.

Add up a list of back-to-back task durations from a start date to find a project’s finish date — counting working days and skipping weekends.

Plan a meeting across three time zones — enter the time in your zone and its UTC offset and see the matching local time, with day shifts, in two other zones.

Find the Moon’s age in days — how long since the last new moon — for any date, with the current phase name and approximate illumination.

Find the date of Easter Sunday for any year — Western (Gregorian) or Orthodox — plus Good Friday, Ash Wednesday, Ascension and Pentecost.

Count down to a big milestone birthday — 18, 21, 30, 40, 50 or any age — with the exact date and day of the week.

See which wedding anniversary is coming up (or when your 25th or 50th falls), its name, traditional and modern gift, gemstone and flower, how many days to go, how long you have been married and a list of your next anniversaries.

Find the exact date you hit a round number of days, weeks, months, hours, minutes or seconds alive — 10,000 days, 1,000 weeks, a billion seconds — count down to it, and see every popular milestone on one list.

Find your half-birthday — six months from your birthday — and count down the days until you celebrate it.

Count exactly how many days you have been married, in weeks and years too, and see the countdown to your next anniversary.

Count how long you and your partner have been together — in days, weeks, months, years, hours and minutes — with your next 100-day and 1,000-day milestones, next anniversary and monthiversary, fun stats and a full milestone timeline.

Estimate your rescue dog’s or cat’s birthday from its adoption date and age at adoption (or enter a known birth date), then see its age today, human-age equivalent and life stage, the countdown to its next birthday and gotcha day, a likely birthday range and upcoming birthdays and milestones.

Track how old a plant or tree is from its planting date — in days, weeks and years — with the next planting anniversary.

Work out when a product warranty ends from the purchase date and term, and see how many days of cover are left.

Find the exact day a free trial ends and the day to cancel by so you are never charged for a subscription you forgot.

Find the last day to return or exchange a purchase from the delivery date and the store’s return window in days, business days, weeks or months — with days left, a ship-by date, a reminder, the EU/UK 14-day cancellation deadlines and an estimated refund after restocking and shipping fees.

Work out when to set a reminder before an appointment, given how much lead time you want, and count down to both.

Find the exact end date of an agile sprint from its start date and length, plus when the next sprint begins.

Estimate a team’s realistic sprint capacity in person-days from headcount, working days, time off and a focus factor.

Add a safety buffer to an estimate and get a realistic deadline date, in calendar or working days.

Measure lead time, cycle time and wait time for a work item from its request, start and completion dates.

Calculate an SLA response or resolution deadline in business hours, skipping evenings and weekends.

List the upcoming dates of a repeating event — daily, every weekday, weekly on chosen days, monthly by date or by weekday (the 2nd Tuesday, the last Friday), or yearly — with an end date or occurrence limit, weekend shifting and a count per month.

Preview the next run times of a simple cron-like schedule — daily, weekdays, weekly or monthly — at a set hour.

Count the weeks in a semester between two dates, with break weeks or exact break dates and finals removed, plus class meetings for your schedule, contact hours, the midpoint, a week-by-week calendar and which week of term it is today.

Find when a school term or semester ends from its start date and either teaching weeks or a count of school days, with break weeks placed on the calendar, exam weeks, holidays, the last day of classes, a week-by-week calendar and a countdown.

Work out the timesheet or payroll cutoff date before a pay date, using working days or calendar days of lead time.

Find an invoice due date from its date and payment terms — Net 7 to Net 120, EOM, Net 30 EOM, 15th of the following month or custom — with weekend and holiday rules, the 2/10 Net 30 discount deadline and its true cost, late fees, a reminder schedule and a side-by-side table of every term.

Find your exact age on a chosen retirement date — or the date you reach a retirement age — with the time and workdays left, and how it compares with US Social Security, Mexican IMSS or Spanish pension ages.

Work out how long a task will take from the amount of work and your rate (or time per item): hours, working days, a finish date that skips weekends, team size, breaks and setup time, a day-by-day progress table, and the rate or headcount needed to hit a deadline.

Estimate when a job will finish from how long it has already taken and how far along it is — remaining time, total time and a finish clock.

Turn a meeting’s length and headcount into its real payroll cost — per meeting, per minute, and annualised if it repeats.

Plan a task with the Pomodoro technique — how many focus sessions it needs and the total clock time once breaks are added.

Count the working days (Mon–Fri) between today and a deadline, alongside the calendar days, so you know your real runway.

Find the date you’ll finish a book from your pages-per-day pace or your daily reading time — or the pages a day you need to finish by a deadline — with reading days, time per day, a day-by-day schedule and progress milestones.

See when you’ll finish an online course from your lessons per week, your weekly study hours or a deadline — with study time per day, a week-by-week plan, milestone dates and room for breaks.

Find the date you’ll hit a savings target by putting away a fixed amount each week — or the weekly amount you need to get there in a set number of weeks — with optional interest, a weekly step-up (52-week challenge) and a week-by-week schedule.

Find when a training block ends from its length in weeks and your start date, plus the total number of sessions.

Work out the day a supply of medication runs out from the quantity, doses per day, and when you start.

Convert a project’s estimated hours into calendar weeks and a finish date, given how many hours go into it each week.

Find your subscription’s next anniversary and renewal date from the sign-up date and billing cycle, plus cycles completed so far.

Convert weeks pregnant into months — by the calendar, by the common month-of-pregnancy chart and in four-week months — or months back into weeks, with your trimester, time to 40 weeks and a full week-by-week chart.

From your embryo transfer date and embryo day, estimate the beta hCG blood-test date, the earliest home-test day, and an approximate due date.

From your ovulation date and luteal-phase length, find when your next period is due, the implantation window, and the earliest reliable test day.

Enter the first day of your last period to see which cycle day you’re on today, the likely phase, and how many days until your next period.

Find the next full moon after any date with its exact time in your time zone, its traditional name, supermoon, micromoon, Blue Moon and lunar eclipse flags, the Moon’s phase on your date and a calendar of the next full moons.

See how many minutes of daylight you gain or lose each day at any city or latitude — today’s change in minutes and seconds, how much sunrise and sunset move, the weekly and monthly change, the next solstice turning point, the fastest-changing days of the year and a day-by-day table — from the NOAA solar equations, or from two day lengths you measured.

Estimate the morning and evening golden-hour windows for warm, low-sun light from your local sunrise and sunset times.

Estimate the morning and evening blue-hour twilight windows — the deep-blue light just before sunrise and after sunset — from your local times.

Count the days, hours and minutes until the weekend from any date and time — to Saturday, Friday or Sunday, or to when work ends — plus workdays left this week, and the next long weekend with US, Mexican or Spanish public holidays.

Count the working days (Mon–Fri) remaining in the current month from any date, plus how many have passed and the month’s total.

Add up hours worked across the week from daily entries, with your total, days worked, daily average, and how you stand against a target.

Count your current streak from the day you began — day number, full days completed, years, months, weeks and hours, your own goal, a milestone calendar with dates, and the money and time saved.

Find the length of daylight and night from a sunrise and sunset time.

Count the weeks between two dates as a decimal and as full weeks plus days, with an option to include the end date, weekdays and weekend days in the span, ISO week numbers, calendar weeks touched and a week-by-week table.

Calculate hours worked from start and end times minus breaks — one shift or a full weekly timesheet with split and overnight shifts — with daily or weekly overtime, time-clock rounding and gross pay.

Convert hours and minutes into decimal hours for timesheets and payroll.

Count the days until your next birthday and the age you will turn.

Count the working days (Monday to Friday) in any month and year.

Check your Schengen short-stay allowance: enter your past trips and the calculator counts days used in the rolling 180-day window, days remaining on any date, the longest stay you can start now, when days free up again, and the latest exit date for a planned entry — the 90-in-any-180 rule.

Find the exact date a probation period ends from your start date and its length in months, weeks or days, including any extension, plus the halfway point, a review-meeting date and the last weekday.

Count the workdays and working hours in any year for your weekly schedule, minus public holidays and vacation, with a month-by-month table, average monthly hours and the hourly rate a salary works out to.

Find how many hours of a shift fall inside the night window (for example 22:00–06:00), the day hours, and the pay with a night premium — overnight shifts handled automatically.

Find what time you can clock out (leave work) from your clock-in time, the hours you need to work and your unpaid break, with a table of leave times for 4 to 12 paid hours.

List all 24 semi-monthly paydays for a year — 15th and last day, 1st and 15th, or 10th and 25th — moved to the previous or next business day when they fall on a weekend, with gross pay per check.

Convert standard 12-hour time to military time and back: 2:30 PM = 1430 hours. Get the 24-hour clock time, minutes after midnight, Zulu (UTC) time and a full military time chart.

Convert a calendar date and time to the astronomical Julian Day (JD), Julian Day Number and Modified Julian Date — or a JD back to a date — plus the YYDDD Julian date code and the Julian-calendar date.

Convert any Gregorian date to the Maya calendar: Long Count (13.0.0.0.0), Tzolk'in day sign and number, Haab' month, Calendar Round and Lord of the Night, using the standard GMT correlation 584283.

Convert a Gregorian date to the Hebrew (Jewish) calendar and back, with the date in Hebrew letters, leap-year and year-length details and the dates of Rosh Hashanah, Yom Kippur, Hanukkah, Purim and Passover that year.

Find the date of Chinese (Lunar) New Year for any year from 1900 to 2100, computed from the new moons and winter solstice in Beijing time, with the zodiac animal, element, Lantern Festival and the length of the lunar year.

Exact date and time of the March and September equinoxes and the June and December solstices for any year and time zone, with the start and length of each astronomical season in the Northern or Southern Hemisphere.

When do the clocks change? Find the daylight saving time start and end dates for any year in the US and Canada, Europe and the UK, Cuba, Chile, Australia and New Zealand, with the change times and days on DST.

Calculate local sidereal time (LST) and Greenwich mean sidereal time for any date, clock time and longitude, plus the hour angle of a star or deep-sky object and the local time it transits the meridian.

Count the exact hours, minutes and seconds between two dates and clock times — e.g. Monday 08:30 to Thursday 17:15 — with a days-hours-minutes breakdown, decimal days and weeks.

Find your traditional Korean age (born at 1, +1 every New Year), your international age used officially in South Korea since June 28, 2023, and your “year age” (yeon-nai).

What year was I born? Enter an age and whether the birthday has passed this year to get the birth year, the exact range of possible birth dates, and the year of the next birthday.

Find when Ramadan starts and ends in any year from 1900 to 2100: the first fast, Laylat al-Qadr, the last fast and Eid al-Fitr, with a day-by-day Ramadan calendar and a moon-sighting adjustment.

Find the date of Eid al-Adha in any year from 1900 to 2100, with the Day of Arafah, the start of Dhu al-Hijjah, the Hajj days, the days of Tashreeq and the Islamic New Year that follows.

Find the dates of Passover, Rosh Hashanah, Yom Kippur, Sukkot, Hanukkah, Purim and other Jewish holidays in any year, with sundown start, nightfall end and length in Israel or outside Israel.

Find when Carnival falls in any year: Carnival Saturday to Mardi Gras (Shrove Tuesday), Fat Thursday, Carnival Monday and Ash Wednesday, all counted back from Easter, with the next ten years of dates.

Find the Catholic liturgical season, week, celebration, liturgical color, Sunday readings cycle (Year A, B or C) and weekday cycle (I or II) for any date, plus the key dates of that liturgical year.

Find when to start a novena so its ninth day ends on the eve of the feast — Christmas, Our Lady of Guadalupe, Divine Mercy, Pentecost, Saint Jude and more — with all nine dates listed.

Find the date of Mother's Day in any year for the United States, Mexico, Spain, Argentina, the UK and 20+ other countries — fixed dates like May 10 or rules like the second Sunday of May.

Find the date of Father's Day in any year for the United States, Mexico, Spain, Argentina, Brazil, Germany and 20+ other countries — the third Sunday of June, March 19 (Saint Joseph) and more.

Convert any date from 1901 to 2099 to the Chinese lunar calendar: lunar month and day in Chinese, leap months, the sexagenary year, zodiac animal and element, and the start of every lunar month.

Convert dates between the Gregorian and Persian (Solar Hijri, Shamsi or Jalali) calendar used in Iran and Afghanistan: month names in Persian, leap years, Nowruz and the months of the year.

Convert dates between the Gregorian and Ethiopian calendars: Ethiopian year, the 13 months with Amharic names, Pagume leap days and Enkutatash (Ethiopian New Year) for any date from 1800 to 2199.