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.
Which anniversary number calculator
Find which anniversary a given day marks: someone hired on 15 March 2014 reaches their 10th work anniversary on 15 March 2024.
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Project business days calculator
From Monday 6 July to Friday 10 July 2026 a project has 5 business days, and listing 8 July as a holiday leaves 4.
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Days until retirement age calculator
Born on 15 June 1965 and retiring at 65? That day is 15 June 2030, 1,403 days after 12 August 2026.
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Local time from UTC offset calculator
Turn a UTC clock time into local time for an offset you already know: 18:45 UTC at +5:45 in Kathmandu is 00:30 on the next day.
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Next birthday countdown calculator
Someone born on 20 October 1990 has 69 days to go when counting from 12 August 2026, and turns 36 that day.
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Quarters elapsed in fiscal year calculator
On 12 August 2026, with a fiscal year that starts in April, you are in fiscal Q2: one quarter is complete and three remain, counting the current one.
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Ship-by date calculator
Enter the promised delivery date and the carrier's transit in working days to get the latest day to ship: for delivery on Monday 27 July 2026 with five working…
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Weekends Until Date Calculator
From August 12 to September 7, 2026 there are 3 full weekends in 27 days. Only weekends whose Saturday and Sunday both fall inside your range are counted, so a…
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Working days in month calculator
July 2026 has 23 working days: 31 calendar days minus 8 Saturdays and Sundays. Choose a year and a month, add your company holidays, and get one number for hour…
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Years of service calculator
Someone hired on March 15, 2018 has served 8 years, 4 months and 10 days by July 25, 2026. Enter a hire date and a cut-off date to check award eligibility…
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Add minutes to a datetime
Add or subtract whole minutes from a date and time and get the result in UTC: 23:45:30 UTC on 25 July 2026 plus 30 minutes is 00:15:30 UTC on 26 July.
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Add quarters to a date
Move a date by whole quarters of three calendar months: 30 November 2024 plus 1 quarter is 28 February 2025, since February has no 30th.
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Date difference in years, months and days
From 31 January 2019 to 2 March 2024 is 5 years, 1 month and 2 days, or 1,857 days in total. Enter any two calendar dates to get the same calendar breakdown…
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Working days remaining in month
From July 20, 2026 to month end there are 9 working days left: 12 calendar days, minus 2 weekend days and 1 holiday on a weekday.
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Days remaining in the month
From 20 February 2024 there are 9 days left until the month ends on 29 February. Enter a date to get the days remaining, the last day of its month and the…
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Start and end of decade
13 August 2026 sits in the decade from 2020 to 2029, which opens on 1 January 2020 and closes on 31 December 2029.
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Fraction of year elapsed
At noon UTC on 2 July 2026 the year is exactly half over: the fraction is 0.5. Enter a date and time with Z or an offset such as +05:30 to see how far through…
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First and last day of year
For June 15, 2024, the year runs from 2024-01-01 to 2024-12-31 and has 366 days because it is a leap year.
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End of next month calculator
From 15 January 2024 the end of next month is 29 February 2024, because 2024 is a leap year. Enter any date and get the final day of the following month, ready…
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Nth weekday after a date
From Monday 18 March 2024, the first Monday after it is 25 March, not the same day, and the second is 1 April.
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Weekday of the first of the month from an ISO date
Enter any date and find the weekday on which its month began: 13 August 2026 gives 1 August 2026, a Saturday.
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Julian–Gregorian day offset calculator by date year
Enter a date and see the day gap between the Julian and Gregorian calendars for its year: in 2026 the Gregorian calendar is 13 days ahead.
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Week number within quarter
Enter a date to see which week of its calendar quarter it falls in: 20 May 2026 is in week 8 of Q2, counted from 1 April.
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Number of weeks in a month
August 2026 spans 6 calendar weeks when weeks start on Monday, because the month opens on a Saturday.
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Date to .NET ticks converter
29 February 2024 at 12:34:56.1234567 with a +02:30 offset is 638447978961234567 ticks, counted in UTC.
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Hebrew Year Length Calculator
Enter a Hebrew year number and get its exact length in days: 5784 has 383, a deficient leap year. You also see whether the year has a thirteenth month and how…
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Hijri month length calculator
Enter a Hijri year and month number and get its length: month 12 of 1446 AH has 29 days, because 1446 is not a leap year.
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Ethiopian to Gregorian date converter
Ethiopian New Year of 2016, month 1 day 1, is 12 September 2023 in the Gregorian calendar. Enter any Ethiopian year, month and day, including the five or six…
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Good Friday date calculator
Enter a year and get the date of Good Friday: in 2026 it is Friday 3 April, two days before Gregorian Easter Sunday.
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Gregorian to Minguo ROC year and date converter
Enter a Gregorian date to get its Minguo equivalent; 2024-07-25 becomes 113-07-25, because Minguo year 1 is 1912.
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Cyber Monday date
Cyber Monday 2026 falls on 30 November, four days after Thanksgiving on Thursday 26 November. Enter a year to get the date and the Thanksgiving it is anchored…
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EU daylight saving end date calculator
In 2026, EU summer time ends on Sunday 25 October at 01:00 UTC. Enter a year from 1996 onward to get the last Sunday in October and the exact UTC moment the…
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Super Bowl Sunday date calculator
Enter a year to get the date traditionally tied to Super Bowl Sunday, the second Sunday of February: for 2026 that is 8 February.
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Whit Monday date calculator
Whit Monday 2026 falls on May 25, the day after Pentecost on May 24 and 50 days after Easter on April 5.
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Tabular Day of Ashura date calculator
Enter a Hijri year and get the Gregorian date of 10 Muharram under the tabular Islamic calendar: for 1446 it is Wednesday 17 July 2024.
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Shavuot date calculator by Gregorian year
Enter a Gregorian year and get the civil date of Shavuot, which is 6 Sivan: for 2026 it falls on 22 May, in Hebrew year 5786.
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Gap between two time intervals
Enter two time ranges and get the time that separates them: one ending at 10:30 UTC and another starting at 12:00 at +01:00 are 30 minutes apart, or 1800…
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ISO 8601 duration to seconds converter
Paste an ISO 8601 duration and get its length in seconds: P1Y2M3DT4H5M6S is 36993906 seconds. Years count as 365 days and months as 30, so the answer never…
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Milestone birthday dates calculator from a birth date
Enter a birth date and get the exact dates of milestone birthdays: someone born on 1990-05-17 turns 18 on 2008-05-17, 21 on 2011-05-17 and 65 on 2055-05-17.
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Date of your next round age
Born on 17 August 1994? On 13 August 2026 you are 31, and your next round age, 40, arrives on 17 August 2034.
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Time elapsed percentage calculator
Enter a start, an end and a moment to check, and see how far through the interval it is: 14:00 in a window from 08:00 to 20:00 UTC is 50% of the way.
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Convert an ISO datetime to Windows FILETIME
Enter a date and time with Z or an offset and get the Windows FILETIME count of 100-nanosecond steps since 1 January 1601 UTC: 2025-01-01T00:00:00Z is…
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Military time zone letter
Enter a whole-hour UTC offset and get its military time zone letter and NATO name: +1 is A for Alpha, 0 is Z for Zulu and −1 is N for November.
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Minutes to UTC offset string
Turn a signed number of minutes into a clean UTC offset: 330 becomes UTC+05:30, -75 becomes UTC-01:15 and 60 becomes UTC+01:00.
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Civil Twilight Times Calculator
On 21 June 2026 at latitude 40.7128 and longitude -74.006, civil twilight begins at 08:51 UTC and ends at 01:04 UTC the next day.
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Date as fractional year
Midnight UTC at the start of 2 July 2024 is the decimal year 2024.5, exactly halfway through that leap year.
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Next full moon date calculator
From 25 July 2026, the next full moon falls on 29 July 2026. Enter any date and get the first full moon after it, a stable approximate marker for schedules…
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Booklet page imposition order
An 8-page saddle-stitched booklet prints as 8, 1, 2, 7 on the outer sheet and 6, 3, 4, 5 on the inner one.
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Weeks lived so far calculator
Someone born on June 15, 1990 has lived 1884 full weeks by July 25, 2026, and is in week 1885 of life.
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Work anniversary date calculator
Someone hired on June 1, 2019 reaches an 8th work anniversary on June 1, 2027, which is 311 days after July 25, 2026.
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Fraction of month elapsed calculator
By 15 February 2024, 15 of the month's 29 days have passed, just over half of the month, with 14 days to go.
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Age on Other Planets Calculator
See your age in the years of each planet from Mercury to Neptune: at 30 on Earth you have lived 124.560561 Mercury years but only 0.182048 of a Neptune year.
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Christmas Tree Ornament and Light Calculator
A tree decorated over 8 levels at 12.5 ornaments per level needs 100 ornaments. Enter the levels you will cover and the density you want, and get a whole-item…
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Days Until Christmas Calculator
From 1 December 2026 there are 24 days to go until Christmas. Enter any date and get the exact count to the next 25 December, rolling over to the following year…
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Days Until Valentine's Day Calculator
Planning a dinner, a gift or a campaign? From 1 February 2026 there are 13 days left until Valentine's Day.
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Image file size calculator
Enter width, height and bit depth and get the uncompressed size of the image: 1920 by 1080 pixels at 24 bits per pixel is 6,220,800 bytes, or 6.2208 MB.
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