# Calendar date rounder

World's simplest time toolWith 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.

A link to this tool, including input, options and all chained tools.

Can't convert.

## What is a calendar date rounder?

learn more about this toolThis 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 useRound 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**

Round a date with this

precision.

precision.

Use the ceil method to

round a date up.

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**

Round a date with this

precision.

precision.

Use the floor method to

round a date down.

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**

Round a date with this

precision.

precision.

Automatically determine whether

to use ceil or floor method to

round a date.

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**

Round a date with this

precision.

precision.

Use the floor method to

round a date down.

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**

Round a date with this

precision.

precision.

Use the ceil method to

round a date up.

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**

Round a date with this

precision.

precision.

Automatically determine whether

to use ceil or floor method to

round a date.

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://onlinetools.com/time/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=trueAll time tools

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Quickly draw an electronic clock that shows a particular time.

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Quickly find the difference between two calendar dates.

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Quickly change the current date format to any new format.

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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.

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Quickly find the average value of multiple calendar dates.

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Coming soon These time tools are on the way

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Draw a weird-looking clock that shows a particular time.

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Create a GIF animation of a digital clock.

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Create a GIF animation of a clock that's broken.

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Draw a daily calendar for a single day.

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Draw a weekly calendar for any week of the month.

Draw a Yearly Calendar

Draw a yearly calendar for the entire year.

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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.

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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).

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Convert regular clock time to decimal clock time (dectime).

Convert Date to Decimal Date

Quickly regular calendar date to decimal date (decdate).

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Convert regular clock time to hexadecimal time (hextime).

Convert Date to Hex Date

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Create an animation of Phobos and Deimos orbiting Mars.

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Animate Saturn's Moons

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Animate Uranus's Moons

Animate Titania, Oberon, Umbriel, Ariel, Miranda orbiting Uranus.

Animate Neptune's Moons

Animate Triton, Nereid, and Proteus orbiting Neptune.

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Represent a calendar date as a matrix.

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Represent a clock time as a vector.

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Represent a calendar date as a vector.

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Generate Overlapping Times

Generate a bunch of overlapping time intervals.

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Generate a bunch of non-overlapping time intervals.

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Generate random clock time intervals.

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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.

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Generate random calendar date intervals.

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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).

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Add Errors to Calendar Dates

Create errors in the given calendar dates (for testing).

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Quickly find how many days are left till a specific date.

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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.

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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.

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Print a list of clock times with hours equal mins equal secs.

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Print a list of all clock times when hands are in a straight line.

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Normalize Calendar Dates

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Freeform Time Calculator

Perform freeform clock time arithmetics.

Freeform Date Calculator

Perform freeform calendar date arithmetics.

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Calculate Calendar Sum

Find the sum of years plus months plus days.

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Find Calendar Sum

Find calendar date so that year + months + day equals your value.

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Create Zalgo Time

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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.