Dates & time
236 date and time calculators: days between dates, ages, business days, deadlines, time zones, durations and calendars. Exact answers that respect leap years and weekends, free in your browser.
Convert between time zones
Noon UTC on 21 July 2026 is 2:00 p.m. in Madrid and 6:00 a.m. in Costa Rica: convert a moment between two time zones with the daylight-saving rules that apply…
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Count business days
July 2026 has 31 calendar days but only 22 business days once weekends and a holiday on 24 July are removed.
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Create a calendar invite
Turn an appointment into a calendar file: Revision de contrato on 21 July 2026 from 09:00 to 10:00 UTC in Madrid becomes an .ics invite that the main calendar…
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Date difference and age calculator
Get the exact gap between two dates, in total days and in years, months and days, or someone's age on a given date: 31 January to 29 February 2024 is one month…
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Time calculator
This time calculator turns 5400 seconds into 1:30:00, tidies overflowing hours and minutes, splits any seconds total into days, hours, minutes and seconds, and…
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French Republican calendar
Find the Revolutionary date of any day since the calendar began: 22 September 1792 is 1 vendémiaire, Year I.
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Interval intersection
Enter two time ranges and get the part they share: 10:00 to 12:00 and 11:00 to 13:00 UTC overlap from 11:00 to 12:00, exactly one hour.
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Juche era converter
Turn a Gregorian year into a Juche year and back: 2024 is Juche 113. Enter a plain year or a full date, or start from a Juche year to get its Gregorian year.
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Julian ↔ Gregorian converter
Convert a date between the Julian and Gregorian calendars, either way round: 15 October 1582 in the Gregorian calendar is 5 October 1582 in the Julian one.
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Leap seconds UTC↔TAI
Find the gap between atomic time and UTC for any date, or list the leap seconds behind it: on 2017-01-02, TAI−UTC is 37 seconds.
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NTP ↔ Unix timestamp
Unix time 0 is NTP 2208988800: the same instant, midnight on 1 January 1970, counted from two different starting points.
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Parse relative dates
From 10 January 2020 at 12:00 UTC, the phrase in 3 days becomes 13 January 2020 at 12:00 UTC. Type a short English or Spanish phrase and a reference moment to…
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Roman Kalends/Nones/Ides
1 March 2020 is the Kalends of March in the Roman calendar, written Kalendis. Enter a modern date to see how it is named in classical Roman style, counted from…
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UUID v1/v6/v7 to timestamp
Paste a UUID of version 1, 6 or 7 and get the time stored inside it: 018bcfe5-6800-7000-8000-000000000000 holds 2023-11-14T22:13:20.000Z, or 1700000000000 Unix…
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Weekday occurrence in month
Enter a date to learn which occurrence of its weekday it is within the month and whether it is the last: 1 July 2025 is the first Tuesday of July, and not the…
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Orthodox Christmas date
Orthodox Christmas falls on 7 January 2026, because it keeps 25 December of the Julian calendar, which runs 13 days behind.
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Victoria Day (Canada) date
Enter a year to get the date of Victoria Day in Canada, the Monday on or before 24 May: in 2026 it falls on 18 May.
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Week of month calculator
Enter a date to find which week of its month it falls in: 25 July 2026 is in week 4, because the 25th divided by seven, rounded up, gives 4.
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Add working days to a date
Add or subtract working days and skip every Saturday and Sunday: 5 working days after Monday 20 July 2026 is Monday 27 July 2026.
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US daylight saving start date
In 2026, US daylight saving time starts on Sunday 8 March, when most clocks spring forward one hour at 2:00 a.m. local time.
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Days elapsed in the quarter
By 15 February 2026, 45 whole days have passed since the first quarter began on 1 January. Enter a date to see its quarter, the quarter's start and the days…
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Easter Sunday date
Easter Sunday 2026 falls on 5 April. Enter any year to get the Western Easter date, the first Sunday after the church full moon on or after 21 March, then place…
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Generation by birth year
Type a birth year and get its generation with the years that define it: 1990 is a Millennial, part of the 1981 to 1996 cohort, also called Gen Y.
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Add months to a date
Add whole months to a date and get the later calendar day: 31 January 2024 plus 1 month is 29 February 2024, because a day that does not exist moves to the last…
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Birthstone by birth month
Enter a birth month and see its traditional and modern birthstones side by side: for March, the traditional chart lists bloodstone and jasper, while the modern…
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Chinese zodiac sign calculator
2024 is the Year of the Dragon, yet someone born on 9 February 2024 is still a Rabbit, because the animal changes at Chinese New Year, not on 1 January.
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Days between two dates
From 1 January to 11 January 2024 there are 10 days. Enter two dates to get the whole number of calendar days between them, plus a signed figure that shows…
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Days elapsed in the year
By 15 March 2024, 74 whole days of the year have passed, which makes it day 75 of a leap year. Enter a date to see how many days have gone by since 1 January…
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Easter Sunday date calculator
Easter Sunday fell on 31 March in 2024 and on 20 April in 2025. Type any year from 1 to 9999 and get the Western Easter Sunday as a full date, plus its month…
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Julian Day to date converter
Paste a Julian Day number and get the calendar date and clock time it marks: JD 2451545 is noon UT on 1 January 2000, and 2451544.5 is the midnight that starts…
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Golden number and epact calculator
Enter a year and get its ecclesiastical numbers: 2026 is year 13 of the 19-year Metonic cycle and has Gregorian epact 11.
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ISO week number calculator
Type a date and get its ISO week: 2024-01-01 is week 1 of 2024, while 2021-01-01 still sits in week 53 of 2020.
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ISO week to date converter
Turn an ISO week label into a real calendar day: Monday of week 1 of 2024 is 2024-01-01, and Monday of week 1 of 2015 falls back to 2014-12-29.
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First and last day of month
Pick a year and a month to get its first and last dates: February 2024 runs from 2024-02-01 to 2024-02-29, while February 2023 ends on 2023-02-28.
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Next leap year finder
From 2023 the next leap year is 2024, and from 1899 it is 1904, because 1900 has no February 29. Type a year and get the first leap year on or after it, plus…
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Next occurrence of a weekday
From Friday 15 March 2024, the next Monday is 18 March 2024, three days later. Pick a date and a weekday to get the soonest matching day on or after it, handy…
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Subtract days from a date
Enter a date and a number of days to get the exact earlier day: 15 March 2024 minus 10 days is 5 March 2024.
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Add days to a date
Add or subtract a number of calendar days and get the exact day it lands on: 1 March 2024 plus 10 days is 11 March 2024.
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Add years to a date
Add or subtract whole years and get the new date, so 15 March 2024 plus 2 years is 15 March 2026. A leap day lands on 28 February in common years, so 29…
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Birth flower by month
Pick a birth month and get its traditional flower, an alternate and what it stands for: June is the rose, with honeysuckle as alternate, a symbol of love…
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Chinese zodiac element calculator
2024 is Jia-Chen, the Yang Wood Dragon, year 41 of the 60-year cycle that opened with the Wood Rat of 1984.
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Countdown between two dates
From midnight UTC on 1 January 2026 to 01:01:01 on 2 January there are 1 day, 1 hour, 1 minute and 1 second, or 90061 seconds.
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Day of year to date converter
Day 61 of 2024 is 1 March, because 2024 is a leap year with 366 days. Enter a year and a day number to get the calendar date, whether the year is leap and how…
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Day of the week calculator
25 July 2026 falls on a Saturday, ISO weekday 6. Enter any date to get the weekday's full name, its short label and its number, with Monday counted as 1 and…
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Day of the year calculator
1 March 2024 is day 61 of the year; in a common year it would be day 60, since 2024 is a leap year.
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Days in a month calculator
February 2024 has 29 days, because 2024 is a leap year. Enter a year and a month from 1 to 12 to get the exact number of days, the month's name and whether the…
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Days left in the year
On 25 July 2026, 159 full days remain until 31 December: the date is day 206 of 365. Enter any calendar date to get the days left in its year, its day number…
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Decade and century finder
2024 belongs to the 2020s, which run from 2020 to 2029, and to the 21st century, from 2001 to 2100.
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Dominical letter calculator
2024 has the dominical letters G and F: G marks the Sundays of January and February, F those from March onward, because 1 January fell on a Monday.
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Doomsday rule calculator
4 July 2024 was a Thursday, and so was that year's doomsday, shared by easy dates like 4 April, 6 June and 12 December.
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Orthodox Easter date calculator
Orthodox Easter 2024 fell on 5 May: the Julian tables give 22 April, and the 13-day gap between the calendars moves it into May.
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Friday the 13th finder
Enter a year and see every Friday the 13th in it: 2026 has three, on 13 February, 13 March and 13 November.
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Humanize duration
Paste a duration in seconds and get wording a person can read at a glance: 183840 seconds is 2 days 3 hours 4 minutes.
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Leap year checker
Enter a year and find out whether February has 29 days: 2024 is a leap year because it divides by 4 and not by 100, while 1900 is not and 2000 is.
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ISO weekday number
Enter a date and get its ISO weekday number, from 1 for Monday to 7 for Sunday: 2026-07-25 is a Saturday, so the answer is 6.
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Julian Day Number calculator
Turn any calendar date into its astronomical Julian Day Number: 2000-01-01 is day 2451545, with Modified Julian Day 51544 and a leap-year flag alongside.
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Last weekday of the month
Pick a year, a month and a weekday to get the date of its last occurrence: the last Friday of July 2026 is 2026-07-31.
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Leap years in a range
Enter two years and get every leap year between them, both ends included: from 2000 to 2024 there are 7, starting with 2000 and ending with 2024.
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Printable month calendar generator
Pick a year and a month to get a ready-to-print grid of weeks: February 2024 has 29 days, starts on a Thursday and fills 5 rows with Sunday-first weeks.
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Months between two dates
Enter two dates to get the whole months between them plus the leftover days: from 2024-01-15 to 2025-03-10 is 13 months and 23 days.
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