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Calendar date rounder

World's simplest time tool

With this browser-based application, you can round a calendar date up, down, or to the next nearest date. You can adjust the rounding precision in the options and round the date to a day, month, quarter, year, ten years, and century. You can quickly switch between the three rounding methods and instantly get the rounded date in the output. Created by computer nerds from team Browserling.
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Date Rounding Precision
Round a date with this precision.
Round up to 1 month: 2020-08-12 → 2020-09-01. Round up to 1 quarter: 2020-08-12 → 2020-10-01. Round up to 1 year: 2020-08-12 → 2021-01-01. Round up to 1 century: 2020-08-12 → 2100-01-01.
Date Round Method
Use the ceil method to round a date up.
Use the floor method to round a date down.
Automatically determine whether to use ceil or floor method to round a date.
Date Rounding Examples
Round days up: 2020-08-12 20:00:00 → 2020-08-13 00:00:00. Round months down: 2020-08-12 20:00:00 → 2020-08-01 00:00:00. Round to nearest year: 2020-08-12 20:00:00 → 2021-01-01 00:00:00.
Calendar date rounder tool What is a calendar date rounder?
This is a quick online utility for rounding calendar dates. It can round any date to any precision up, down, or to the closest date. When a date is rounded, the least significant date components are set to the smallest possible value (zero for hours/minutes/seconds and one for years/months/days). For example, if the date "2022-05-21 14:23:58" is rounded down to days, then the hours, minutes, and seconds components turn into zeros "2022-05-21 00:00:00". Similarly, when this same date is rounded down to months, we get "2022-05-01 00:00:00", to quarters: "2022-04-01 00:00:00", to years: "2022-01-01 00:00:00", to decades (tens of years): "2020-01-01 00:00:00", and to centuries: "2000-01-01 00:00:00". You can also round time part of a date to an hour, 30 minutes, 15 minutes, 10 minutes, 5 minutes, 1 minute, 30 seconds, 10 seconds, and 5 seconds. In the options, you can switch between three rounding methods: "Round a Date Up", "Round a Date Down", and "Round Date to Nearest". Rounding up increases the date components towards the next largest day/month/year/century. For example, the date "2022-05-21 14:23:58" will become "2022-06-01 00:00:00" when rounding the months up. Rounding down decreases the date components to the beginning of the smallest day/month/year/century. For example, when rounding the date "2022-05-21 14:23:58" down to months, we get "2022-05-01 00:00:00". Rounding to the nearest date determines on its own whether to increase or decrease the date. For example, when rounding the date "2022-05-21 14:23:58" to the nearest day, it becomes "2022-06-01 00:00:00" (because it's 10 days from June and 21 from May), and the date "2022-05-03 14:23:58" becomes "2022-05-01 00:00:00" (because it's 3 days from May and 28 days from June). You can round as many dates as you want at the same time if you enter them one per line to the input. The rounding results can be copied or saved from the output field. Timeabulous!
Calendar date rounder examples Click to use
Round a Date to a Day
In this example, we round up three calendar dates with a precision of one day. Every date that has a clock time part greater than midnight turns into the start of the next day. If the clock time is exactly midnight, then the time is already rounded to a day and doesn't change.
2000-11-24 05:20:50 2034-05-31 16:00:00 2050-02-12 00:00:00
2000-11-25 00:00:00 2034-06-01 00:00:00 2050-02-12 00:00:00
Required options
These options will be used automatically if you select this example.
Round a date with this precision.
Use the ceil method to round a date up.
Round Months Down
This example sets each date to the beginning of the month. Here the rounding algorithm uses the "Round a Date Down" mode with a precision of 1 month. As a result, all calendar days are set to "01" and the time is reset to 00:00:00.
1995-11-23 17:30:00 1980-06-01 00:00:00
1995-11-01 00:00:00 1980-06-01 00:00:00
Required options
These options will be used automatically if you select this example.
Round a date with this precision.
Use the floor method to round a date down.
Find the Middle of the Year
In this example, we use our date rounding program to guess the middle of a leap year and a common year. We set the options to round the given dates to the closest year and enter several leap years (2024) and several common years (2025) in the input that have a difference of 1 second. We can see that the middle of a leap year falls on the midnight of July 2nd (on 2024-07-02 00:00:00) and the middle of a regular year falls on the noon of July 2nd (2025-07-02 12:00:00).
2024-07-01 23:59:59 2024-07-02 00:00:00 2025-07-02 11:59:59 2025-07-02 12:00:00
2024-01-01 00:00:00 2025-01-01 00:00:00 2025-01-01 00:00:00 2026-01-01 00:00:00
Required options
These options will be used automatically if you select this example.
Round a date with this precision.
Automatically determine whether to use ceil or floor method to round a date.
Round Dates in a Quarterly Financial Report
In this example, we are working with a quarterly financial report for q2, 2022. As all dates fit in the interval 2022-04-01 to 2022-07-01, we round them down to the q2 start date. This way all output dates start on the first day on q2, 2022, which is "2022-04-01".
2022-04-28 12:30:00 2022-05-01 06:45:30 2022-05-14 13:05:00 2022-05-31 00:00:00 2022-06-03 04:00:00 2022-06-26 15:00:50
2022-04-01 00:00:00 2022-04-01 00:00:00 2022-04-01 00:00:00 2022-04-01 00:00:00 2022-04-01 00:00:00 2022-04-01 00:00:00
Required options
These options will be used automatically if you select this example.
Round a date with this precision.
Use the floor method to round a date down.
Round a Date to 10 Years
In this example, we round up three different dates to the next decade. After rounding, the months and days are set to the beginning of the year (January 1) and the time is reset to midnight. The year is turned into the next largest year divisible by ten. As a result, the first year is rounded to 2030, the second to 2040, and the third to 2050.
2022-06-25 00:00:00 2038-10-10 10:10:10 2044-01-12 09:00:00
2030-01-01 00:00:00 2040-01-01 00:00:00 2050-01-01 00:00:00
Required options
These options will be used automatically if you select this example.
Round a date with this precision.
Use the ceil method to round a date up.
Which Century is a Date Closest To?
In this example, we load a list of random dates from 2000 to 2100 and we want to determine which century each date is closest to. To find the answer, we select the century round precision and switch to the nearest rounding mode. As soon as we do that, we get the answer to our question and all dates are shifted back either to 2000 (if they are closer to 2000) or shifted forward to 2100 (if they are closer to 2100).
2002-03-27 00:53:57 2090-09-27 21:47:19 2005-10-10 01:17:37 2030-07-22 13:10:02 2095-12-12 16:59:45 2089-10-28 13:04:01 2058-03-13 13:13:48 2022-07-21 06:12:01 2057-12-13 00:56:07 2004-04-28 06:36:49
2000-01-01 00:00:00 2100-01-01 00:00:00 2000-01-01 00:00:00 2000-01-01 00:00:00 2100-01-01 00:00:00 2100-01-01 00:00:00 2100-01-01 00:00:00 2000-01-01 00:00:00 2100-01-01 00:00:00 2000-01-01 00:00:00
Required options
These options will be used automatically if you select this example.
Round a date with this precision.
Automatically determine whether to use ceil or floor method to round a date.
Pro tips Master online time tools
You can pass input to this tool via ?input query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlinetimetools.com/round-calendar-date?input=2000-11-24%2005%3A20%3A50%0A2034-05-31%2016%3A00%3A00%0A2050-02-12%2000%3A00%3A00&round-to=to-1-day&round-up=true
All time tools
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Quickly visualize your life in weeks or months.
Quickly draw an analog clock that shows a particular time.
Quickly draw a digital clock that shows a particular time.
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Quickly convert seconds to clock time in H:M:S format.
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Quickly find how many seconds are left till midnight.
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Quickly find the age difference between two or more people.
Quickly add hours, minutes, and seconds to the given time.
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Quickly add days, months, and years to the given date.
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Quickly sort clock times in ascending or descending order.
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Quickly check if the given calendar date is valid.
Quickly find how many hours are in the given days.
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Quickly find the average value of multiple calendar dates.
Quickly generate a list of random clock times.
Quickly generate a list of random calendar dates.
Quickly create a list of clock times that match your criteria.
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Quickly split the given time period into multiple intervals.
Quickly split the given date period into multiple intervals.
Quickly generate increasing or decreasing clock times.
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Quickly test if the given year is a common year.
Quickly find how old a cat would be if it was a human.
Quickly find how old a human would be if he/she was a cat.
Quickly find how old a dog would be if it was a human.
Quickly find how old a human would be if it was a dog.
Quickly convert a modern Gregorian date to a Julian date.
Quickly convert an ancient Julian date to a Gregorian date.
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Quickly convert the Julian day to a regular calendar date.
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Quickly generate increasing or decreasing UNIX timestamps.
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Quickly convert a HH:MM:SS clock to a military HHMM clock.
Quickly convert a military clock HHMM to a HH:MM:SS clock.
Quickly write a clock time in text format (as English text).
Quickly write a calendar date in text format (as English text).
Quickly add slight perturbations to the given clock times.
Quickly add slight perturbations to the given calendar dates.
Quickly find what day of the week the given calendar date falls on.
Quickly find what day of the year the given calendar date falls on.
Quickly find what week of the year the given calendar date falls on.
Quickly calculate the calendar date from a day number of a year.
Quickly find the angle between the hour hand and minute hand.
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Quickly print all dates when a specific day happens.
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Quickly create a list of all Independence Day dates.
Quickly create a list of all Christmas Day dates.
Quickly create a list of all New Year dates.
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Quickly draw a timeline of multiple time intervals.
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Quickly convert time and date from one timezone to another.
Quickly convert time and date from one country to another.
Quickly print the season (winter, spring, summer, autumn) by date.
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Draw a binary clock that shows time in base two.
Draw a Salvador Dali Clock
Draw a clock in Salvador Dali style showing custom time.
Draw a Weird Clock
Draw a weird-looking clock that shows a particular time.
Animate an Analog Clock
Create a GIF animation of an analog clock.
Animate a Digital Clock
Create a GIF animation of a digital clock.
Animate a Broken Clock
Create a GIF animation of a clock that's broken.
Draw a Daily Calendar
Draw a daily calendar for a single day.
Draw a Weekly Calendar
Draw a weekly calendar for any week of the month.
Draw a Yearly Calendar
Draw a yearly calendar for the entire year.
Draw a Lunar Calendar
Draw a calendar that shows moon phases.
Draw a Solar Calendar
Draw a calendar that shows the seasons and Sun's position.
Create an Animated Timer
Draw an animation that counts down (or up) time.
Animate an Hourglass
Create a GIF animation of a sand clock.
Draw an Infinite Spiral Clock
Animate a timeless clock that goes in an infinite spiral.
Draw Time as a Pie Chart
Visualize the given clock time as a pie chart.
Draw Date as a Pie Chart
Visualize the current year as a pie chart.
Draw Time as a Bar Chart
Visualize the given clock time as a bar chart.
Draw Date as a Bar Chart
Visualize the current year as a bar chart.
Draw Time as a Pixel Wall
Visualize the given clock time as a pixel wall (1px = 1sec).
Draw Date as a Pixel Wall
Visualize the current year as a pixel wall (1px = 1day).
Draw Time as Bubbles
Visualize the given clock time as bubbles.
Draw Date as Bubbles
Visualize the current year as bubbles.
Draw a Time Arrow
Visualize the given clock time as an arrow.
Convert Time to Percentage
Quickly calculate time passed and left in the current day as pct.
Convert Date to Percentage
Quickly calculate time passed and left in the current year as pct.
Convert Time to Binary Time
Convert regular clock time to binary clock time (bintime).
Convert Date to Binary Date
Quickly regular calendar date to binary date (bindate).
Convert Time to Decimal Time
Convert regular clock time to decimal clock time (dectime).
Convert Date to Decimal Date
Quickly regular calendar date to decimal date (decdate).
Convert Time to Hex Time
Convert regular clock time to hexadecimal time (hextime).
Convert Date to Hex Date
Quickly regular calendar date to hexadecimal date (hexdate).
Animate Moon's Phases
Create a GIF animation of the Moon for a particular month.
Animate Moon's Orbit
Create an animation of the Moon orbiting the Earth.
Animate Mercury's Orbit
Create a 88 day animation of the Mercury orbiting the Sun.
Animate Venus's Orbit
Create a 225 day animation of the Venus orbiting the Sun.
Animate Earth's Orbit
Create a 365 day animation of the Earth orbiting the Sun.
Animate Mars's Orbit
Create a 687 day animation of the Mars orbiting the Sun.
Animate Jupiter's Orbit
Create a 4,330 day animation of the Jupiter orbiting the Sun.
Animate Saturn's Orbit
Create a 10,756 day animation of the Saturn orbiting the Sun.
Animate Uranus's Orbit
Create a 30,687 day animation of the Uranus orbiting the Sun.
Animate Neptune's Orbit
Create a 60,190 day animation of the Neptune orbiting the Sun.
Animate Pluto's Orbit
Create a 90,560 day animation of the Pluto orbiting the Sun.
Animate Solar System
Create an animation of all planets in the Solar System.
Animate Mars's Moons
Create an animation of Phobos and Deimos orbiting Mars.
Animate Jupiter's Moons
Animate Io, Europa, Ganymede, Callisto orbiting Jupiter.
Animate Saturn's Moons
Animate Titan, Rhea, Iapetus, Enceladus orbiting Saturn.
Animate Uranus's Moons
Animate Titania, Oberon, Umbriel, Ariel, Miranda orbiting Uranus.
Animate Neptune's Moons
Animate Triton, Nereid, and Proteus orbiting Neptune.
Animate Pluto's Moons
Animate Charon, Nix, Hydra, Kerberos, Styx orbiting Pluto.
Find When Planets Align
Find dates when two or more planets align in a straight line.
Find Dates of Solar Eclipse
Find dates when the solar eclipse happens.
Find Dates of Lunar Eclipse
Find dates when the lunar eclipse happens.
Create a Time Matrix
Represent a clock time as a matrix.
Create a Date Matrix
Represent a calendar date as a matrix.
Create a Time Vector
Represent a clock time as a vector.
Create a Date Vector
Represent a calendar date as a vector.
Visualize Time Series
Draw a time series chart.
Find Overlapping Times
Given a bunch of time intervals, find overlapping intervals.
Generate Overlapping Times
Generate a bunch of overlapping time intervals.
Generate Non-overlapping Times
Generate a bunch of non-overlapping time intervals.
Generate Random Time Intervals
Generate random clock time intervals.
Find Overlapping Dates
Given a bunch of date intervals, find overlapping intervals.
Generate Overlapping Dates
Generate a bunch of overlapping date intervals.
Generate Non-overlapping Dates
Generate a bunch of non-overlapping date intervals.
Generate Random Date Intervals
Generate random calendar date intervals.
Swap Clock Hands
Swap a clock's hour hand with minute hand.
Reverse Clock Time
Find the reverse of the given clock time.
Invert Clock Time
Find the inverse of the given clock time.
Shift Clock Time
Shift the given clock time by any time interval.
Change Clock Scale
Change the clock scale from 24 hours to any other hours.
Generate Valid Clock Times
Generate a list of valid clock times (for testing).
Generate Invalid Clock Times
Generate a list of invalid clock times (for testing).
Generate Valid Calendar Dates
Generate a list of valid calendar dates (for testing).
Generate Invalid Calendar Dates
Generate a list of invalid calendar dates (for testing).
Add Errors to Clock Times
Create errors in the given clock times (for testing).
Add Errors to Calendar Dates
Create errors in the given calendar dates (for testing).
Convert Date to Seconds
Convert a calendar date to seconds.
Convert Seconds to Date
Convert seconds to a calendar date.
Convert English to Crontab
Create a crontab expression from human language.
Convert Crontab to English
Rewrite a crontab entry into human language.
Find Week of the Month
Quickly find the week of the month of a calendar date.
Find Days Since the Start of Year
Quickly find how many days have passed since start of the year.
Find Days Till the End of Year
Quickly find how many days are left till the end of the year.
Find Days Till a Specific Date
Quickly find how many days are left till a specific date.
Convert Seconds To Minutes
Find how many minutes are in the given seconds.
Convert Seconds To Hours
Find how many hours are in the given seconds.
Convert Seconds to Days
Find how many days are in the given seconds.
Convert Seconds to Weeks
Find how many weeks are in the given seconds.
Convert Seconds to Months
Find how many months are in the given seconds.
Convert Seconds to Years
Find how many years are in the given seconds.
Convert Minutes to Seconds
Find how many seconds are in the given minutes.
Convert Minutes To Hours
Find how many hours are in the given minutes.
Convert Minutes to Days
Find how many days are in the given minutes.
Convert Minutes to Weeks
Find how many weeks are in the given minutes.
Convert Minutes to Months
Find how many months are in the given minutes.
Convert Minutes to Years
Find how many years are in the given minutes.
Convert Hours To Seconds
Find how many seconds are in the given hours.
Convert Hours to Minutes
Find how many minutes are in the given hours.
Convert Hours to Weeks
Find how many weeks are in the given hours.
Convert Hours to Months
Find how many months are in the given hours.
Convert Hours to Years
Find how many years are in the given hours.
Convert Days to Seconds
Find how many seconds are in the given days.
Convert Days to Minutes
Find how many minutes are in the given days.
Convert Days to Weeks
Find how many weeks are in the given days.
Convert Days to Months
Find how many months are in the given days.
Convert Days to Years
Find how many years are in the given days.
Convert Weeks to Seconds
Find how many seconds are in the given weeks.
Convert Weeks To Minutes
Find how many minutes are in the given weeks.
Convert Weeks To Hours
Find how many hours are in the given weeks.
Convert Weeks to Days
Find how many days are in the given weeks.
Convert Weeks to Months
Find how many months are in the given weeks.
Convert Weeks to Years
Find how many years are in the given weeks.
Convert Months to Seconds
Find how many seconds are in the given months.
Convert Months To Minutes
Find how many minutes are in the given months.
Convert Months To Hours
Find how many hours are in the given months.
Convert Months to Days
Find how many days are in the given months.
Convert Months to Weeks
Find how many weeks are in the given months.
Convert Months to Years
Find how many years are in the given months.
Convert Years to Seconds
Find how many seconds are in the given years.
Convert Years To Minutes
Find how many minutes are in the given years.
Convert Years To Hours
Find how many hours are in the given years.
Convert Years to Days
Find how many days are in the given years.
Convert Years to Weeks
Find how many weeks are in the given years.
Convert Years to Months
Find how many months are in the given years.
Convert a Bird's Age to Human Years
Find how old a human would be if he/she was a bird.
Convert a Human's Age to Bird Years
Find how old a bird would be if it was a human.
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Convert clock time on Earth to clock time on Mars.
Convert Mars Time to Earth Time
Convert clock time on Mars to clock time on Earth.
Generate Equal H:M:S Times
Print a list of clock times with hours equal mins equal secs.
Generate Equal Y-M-D Dates
Print a list of calendar dates with years equal months equal days.
Set Straight Clock Hands
Print a list of all clock times when hands are in a straight line.
Normalize Clock Times
Given clock times in various formats, convert them to one format.
Normalize Calendar Dates
Given calendar dates in various formats, make them the same format.
Rotate Clock Times
Cyclically shift HH, MM, SS time parts to the left or right.
Rotate Calendar Dates
Cyclically shift YYYY, MM, DD date parts to the left or right.
Freeform Time Calculator
Perform freeform clock time arithmetics.
Freeform Date Calculator
Perform freeform calendar date arithmetics.
Calculate Clock Sum
Find the sum of hours plus minutes plus seconds.
Calculate Calendar Sum
Find the sum of years plus months plus days.
Find Clock Sum
Find clock hand position so that hr + min + sec equals your value.
Find Calendar Sum
Find calendar date so that year + months + day equals your value.
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