# Clock time rounder

## World's simplest time tool

With this browser-based application, you can round a clock time up, down, or to the nearest time unit. You can select the rounding precision in the options and round the time to 5, 10, or 30 seconds, 1, 5, 10, 15, or 30 minutes, or 1 hour. You can switch between the rounding methods with a single click and get instant results in the output. Created by computer nerds from team Browserling.

we have a comic!
comic for nerds

We have created our own comic! Check it out! New comics every week.

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

Can't convert.

Clock time rounder tool
What is a clock time rounder?

This is a quick online utility for rounding clock times. If you have a list of clock times or timer values in the format hh:mm:ss, then sometimes you don't need these exact values but you need rounded approximate values. For example, you may want to round the seconds and leave just hours and minutes values (hh:mm:00), or you may want to round the minutes as well and leave just the hours values (hh:00:00). To correctly drop seconds and minutes from the time, you need to use the right rounding mode and precision. This program supports the rounding precision to 5 seconds (resulting in hh:mm:s0 or hh:mm:s5), to 10 seconds (resulting in hh:mm:s0), to 30 seconds (resulting in hh:mm:30 or hh:mm:00), to 1 minute (resulting in hh:mm:00), to 5 minutes (resulting in hh:m5:00 or hh:m0:00), to 10 minutes (resulting in hh:m0:00), to 15 minutes (resulting in hh:15:00, hh:30:00, hh:45:00, or hh:00:00), to 30 minutes (resulting in hh:30:00 or hh:00:00), and to 1 hour (resulting in hh:00:00). There are three rounding methods: "Round Up", "Round Down", and "Round to Nearest". The "Round Up" method will always find the next closest time unit. For example, a time "04:15:36" will turn into "04:15:40" (with a precision of 10 seconds). The "Round Down" method will always find the previous closest time unit. For example, a time "04:15:36" will turn into "04:15:30" (with a precision of 10 seconds). The "Round to Nearest" method will find whichever time unit is the closest. For example, a time "04:15:36" will turn into "04:15:40" (with a precision of 10 seconds) and a time "04:15:34" will turn into "04:15:30" (also with a precision of 10 seconds). Timeabulous!

Clock time rounder examples
Click to use

Round a Time to 10 Seconds

In this example, we round the given clock times up. We use a precision of ten seconds, which means that each time rounds the second part up to the next nearest 10, 20, 30, 40, 50, or 00 seconds.

12:15:36
04:10:48
01:00:01

12:15:40
04:10:50
01:00:10

**Required options**

Round a clock time up.
(Ceil method.)

Round a Time to 1 Minute

This example rounds a bunch of times down to 1 minute. As a result, the seconds component of each time becomes zero and the minutes component is rounded down to the previous lowest number. This example also adjusts the clock times which have the minutes and seconds parts exceed the maximum value of 59 minutes or seconds (that is, it works with excessive clock times).

06:35:15
10:10:39
08:50:63
02:65:08

06:35:00
10:10:00
08:51:00
03:05:00

**Required options**

Round a clock time down.
(Floor method.)

Round a Timer to 1 Hour

In this example, we round several timer values to the nearest hour. When the rounding is performed, the minutes and seconds components disappear and only the rounded hours' values are printed to the nearest whole number.

11:59:59
11:30:00
11:29:00
11:01:01

12:00:00
12:00:00
11:00:00
11:00:00

**Required options**

Round a clock time to
the nearest time unit.

Round a Time to 5 Minutes

In this example, we round three clock times up to 5 minutes. This rounding precision returns two time formats: "hh:m5:00" or "hh:m0:00".

14:03:04
05:51:55
21:57:00

14:05:00
05:55:00
22:00:00

**Required options**

Round a clock time up.
(Ceil method.)

Round a Time to 15 Minutes

In this example, we select the rounding precision of 15 minutes and switch to the round-down mode. As a result, the first time is rounded to 15 minutes, the second to 30 minutes, the third to 45 minutes, and the fourth to 00 minutes.

19:20:20
07:33:56
04:50:40
23:09:09

19:15:00
07:30:00
04:45:00
23:00:00

**Required options**

Round a clock time down.
(Floor method.)

Round a Timer to 30 Minutes

This example rounds each timer to the nearest half an hour. If the minute's value in the timer is less than 15, then the minutes are truncated to 0. If the minutes are from 15 (including) to 45 (not including), then they become 30. If the minutes are greater than 45, then they are truncated to 0 and the hour value is increased by 1h.

12:00:45
10:25:30
22:46:34

12:00:00
10:30:00
23:00:00

**Required options**

Round a clock time to
the nearest time unit.

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-clock-time

__?input__=12%3A15%3A36%0A04%3A10%3A48%0A01%3A00%3A01&round-to=to-10-sec&round-up=true
All time tools

Quickly visualize your life in weeks or months.

Quickly print a list of neat-looking clock times (such as 10:11:12).

Quickly print a list of neat-looking calendar dates (such as 2055-05-05).

Quickly convert clock time in H:M:S format to seconds.

Quickly convert seconds to clock time in H:M:S format.

Quickly convert time in 24 hour format to 12 hour format.

Quickly convert time in 12 hour format to 24 hour format.

Quickly find how many seconds have passed since midnight.

Quickly find how many seconds are left till midnight.

Quickly find the difference between two clock times.

Quickly find the difference between two calendar dates.

Quickly find the age difference between two or more people.

Quickly add hours, minutes, and seconds to the given time.

Quickly subtract hours, minutes, and seconds from the given time.

Quickly add days, months, and years to the given date.

Quickly subtract days, months, and years to from the given date.

Quickly change the current time format to any new format.

Quickly change the current date format to any new format.

Quickly round the given clock time up or down.

Quickly round the given calendar date up or down.

Quickly drop seconds and minutes from a clock time.

Quickly drop days and months from a calendar date.

Quickly sort clock times in ascending or descending order.

Quickly sort calendar dates in ascending or descending order.

Quickly check if the given clock time is valid.

Quickly check if the given calendar date is valid.

Quickly find how many hours are in the given days.

Quickly find how many days are in the given hours.

Quickly find the astrological sign by the birthday or any date.

Quickly print a list of the dates of all astrological signs.

Quickly find the average value of multiple clock times.

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.

Quickly generate a list of calendar dates that match your criteria.

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.

Quickly generate increasing or decreasing calendar dates.

Quickly print a list of all leap years.

Quickly print a list of all common years.

Quickly test if the given year is a leap year.

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.

Quickly calculate the Julian day number for any calendar date.

Quickly convert the Julian day to a regular calendar date.

Quickly print a list of all Easter dates for all years.

Quickly convert a UNIX Epoch time to a human-readable time.

Quickly convert human-readable time to a UNIX Epoch time.

Quickly generate increasing or decreasing UNIX timestamps.

Quickly generate one or more random UNIX Epoch times.

Quickly convert a HH:MM:SS clock to a military HHMM clock.

Quickly convert a military clock HHMM to a HH:MM:SS clock.

Coming soon
These time tools are on the way

Draw an Analog Clock

Draw an analog clock that shows particular time.

Draw a Digital Clock

Draw a digital clock that shows 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.

Draw a Calendar

Draw a daily, monthly, or yearly calendar.

Draw a Lunar Calendar

Draw a calendar that shows moon phases.

Create an Animated Timer

Draw an animation that counts down (or up) time.

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 Current Year 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 Current Year as a Bar Chart

Visualize the current year as a bar chart.

Draw a Time Arrow

Visualize the given clock time as an arrow.

Visualize Time Intervals

Draw a visualization of multiple time intervals.

Visualize Time Series

Draw a time series chart.

Find Season by a Date

Print the season (winter, spring, summer, autumn) by a date.

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.

Generate Invalid Clock Times

Generate a list of invalid clock times.

Generate Valid Calendar Dates

Generate a list of valid calendar dates.

Generate Invalid Calendar Dates

Generate a list of invalid calendar dates.

Convert English to Crontab

Create a crontab expression from human language.

Convert Crontab to English

Rewrite a crontab entry into human language.

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.

Find Week of the Year

Given a calendar date, find which week of the year it is.

Find Day of the Year

Given a calendar date, find which day of the year it is.

Find Day of the Week

Given a calendar date, find which day of the week it is.

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.

Convert Earth Time to Mars Time

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 Palindromic Times

Print a list of symmetric clock times.

Generate Palindromic Dates

Print a list of symmetric calendar dates.

Generate Equal H:M:S Times

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

Generate Equal Y-M-D Dates

Print a list of calendar dates with yr equal mon equal day.

Calculate Clock Hand Angle

Find the angle between hour hand and minute hand.

Set Clock Hand Angle

Print a list of all clock times with a specific hand angle.

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.

Spell Clock Times

Write out clock times in full text format.

Spell Calendar Dates

Write out calendar dates in full text 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.

Create Zalgo Time

Generate date and time that only Zalgo can understand.

Subscribe!
Never miss an update

Cool!

Notifications
We'll let you know when we add this tool

Cool!