With this browser-based application, you can subtract any time interval from the given clock time. The time interval to be subtracted can be any hours, minutes, and seconds (specified in the options). The decremented time can be output in various formats (24-hour clock, 12-hour clock, text, or seconds) and if the clock goes back too much, you can control the time underflow using four underflow modes. Created by computer nerds from team Browserling.

With this browser-based application, you can subtract any time interval from the given clock time. The time interval to be subtracted can be any hours, minutes, and seconds (specified in the options). The decremented time can be output in various formats (24-hour clock, 12-hour clock, text, or seconds) and if the clock goes back too much, you can control the time underflow using four underflow modes. Created by computer nerds from team Browserling.

This is a quick online utility for decrementing one or more clock times by any time amount. When time is decremented, the clock moves backward. There are many use-cases for this time operation. For example, if you had a great workout and recorded great sprint times but then noticed that there was a stopwatch measurement error of two seconds, then you can quickly and effortlessly subtract these 2 seconds from each recorded time. Another great use-case is making DST adjustments when the clock is moved back by one hour. Overall, you can subtract any number of seconds, minutes, and hours from a clock time (or multiple clock times). The interval that needs to be subtracted can be set in the options using several different formats. For example, the interval can be "2 hours", "5 minutes", "30 seconds", "1h 2m 3s", "8 hours 2 min", or "5:10:02". Each time to be decremented must be listed in the input field, one per line. You can use full or partial 24-hour and 12-hour time formats in the input. For example, good inputs are "20:30:00", "20:30", or "10:30 pm". When the time is shifted backward, it will appear in the output field. You can choose from a variety of time formats for the output, and display the time as a digital clock (24-hour and 12-hour formats), in absolute number of seconds, or as spelled text. A separate option can be used to control the scenario when time underflows. Underflow happens when you decrease midnight time by 1 second (or more). For example, if the current time is 00:00:05 (5 seconds past midnight) and you decrease this time by 10 seconds, then you'll get the previous day 23:59:55. The "Print Strict Time" underflow method will print "23:59:55". You can also mark the previous day (or days) via the "Mark Time Underflow" underflow method and you will get "23:59:55 (-1)". The "minus 1" here indicates that day changed by one day backwards. You can also enable negative time with the "Print Non-strict Time" method. Here, the new time will be printed with a minus sign and you'll get "-00:00:05". Finally, if you want the time to stop at midnight "00:00:00", use the "Stop Time at Midnight" method. If instead of decrementing time, you need to increment time, use our increment clock time program. Timeabulous!

This is a quick online utility for decrementing one or more clock times by any time amount. When time is decremented, the clock moves backward. There are many use-cases for this time operation. For example, if you had a great workout and recorded great sprint times but then noticed that there was a stopwatch measurement error of two seconds, then you can quickly and effortlessly subtract these 2 seconds from each recorded time. Another great use-case is making DST adjustments when the clock is moved back by one hour. Overall, you can subtract any number of seconds, minutes, and hours from a clock time (or multiple clock times). The interval that needs to be subtracted can be set in the options using several different formats. For example, the interval can be "2 hours", "5 minutes", "30 seconds", "1h 2m 3s", "8 hours 2 min", or "5:10:02". Each time to be decremented must be listed in the input field, one per line. You can use full or partial 24-hour and 12-hour time formats in the input. For example, good inputs are "20:30:00", "20:30", or "10:30 pm". When the time is shifted backward, it will appear in the output field. You can choose from a variety of time formats for the output, and display the time as a digital clock (24-hour and 12-hour formats), in absolute number of seconds, or as spelled text. A separate option can be used to control the scenario when time underflows. Underflow happens when you decrease midnight time by 1 second (or more). For example, if the current time is 00:00:05 (5 seconds past midnight) and you decrease this time by 10 seconds, then you'll get the previous day 23:59:55. The "Print Strict Time" underflow method will print "23:59:55". You can also mark the previous day (or days) via the "Mark Time Underflow" underflow method and you will get "23:59:55 (-1)". The "minus 1" here indicates that day changed by one day backwards. You can also enable negative time with the "Print Non-strict Time" method. Here, the new time will be printed with a minus sign and you'll get "-00:00:05". Finally, if you want the time to stop at midnight "00:00:00", use the "Stop Time at Midnight" method. If instead of decrementing time, you need to increment time, use our increment clock time program. Timeabulous!

Click to try!

click me
### Set Clocks Back by One Hour

**Required options**

In this example, we switch to wintertime and set all clocks back by one hour. In the options, we enter the interval equal to "1 hour" and activate the "Print Strict Time" option so that the time that's close to 00:00:00 keeps decreasing from 23:59:59.

10:20:30
06:00:00
20:50:00
14:40:04
00:30:00

09:20:30
05:00:00
19:50:00
13:40:04
23:30:00

Set the decrement interval.

Format for the decremented

time.

time.

Options to control time

behavior when it's decreased

below 00:00:00.

behavior when it's decreased

below 00:00:00.

click me
### Decrement 12-hour Time

**Required options**

In this example, we load a list of clock times in a 12-hour format and subtract 2 hours and 40 minutes from them. Since we have a non-strict time mode selected, times that underflow 00:00:00 become negative.

2 am
5 am
8 pm
10:40 am
9:45:50 pm

-0:40:0 am
2:20:0 am
5:20:0 pm
8:0:0 am
7:5:50 pm

Set the decrement interval.

Format for the decremented

time.

time.

Options to control time

behavior when it's decreased

below 00:00:00.

behavior when it's decreased

below 00:00:00.

click me
### Decrease the Time by More than a Day

**Required options**

In this example, we decrement the given time values by 25 hours, which is equal to one day and one hour. By subtracting such a large time interval, many of the time values underflow the midnight point (00:00:00). When such underflow happens, the day changes to one day in the past. To see how many days have passed, we activate the "Mark Time Underflow" mode, which shows in the parentheses how many days in the past each time ends up.

00:00
06:00
12:00
24:00
32:00

23:0:0 (-2)
5:0:0 (-1)
11:0:0 (-1)
23:0:0 (-1)
7:0:0

Set the decrement interval.

Format for the decremented

time.

time.

Options to control time

behavior when it's decreased

below 00:00:00.

behavior when it's decreased

below 00:00:00.

click me
### Decrease Time Within One Day

**Required options**

In this example, we shift several times backward by a custom interval and we disallow the times to be shifted beyond the boundaries of a single day. In other words, when the time reaches 00:00:00, the time freezes and no longer decreases. We shift all clocks back by 9 hours, 39 min, and 59 secs and to make it easier and quicker to write this interval in the options, we use the digital clock interval format "09:39:59" for it.

04:30:28
08:00:00
09:40:00
10:39:59

00:00:00
00:00:00
00:00:01
01:00:00

Set the decrement interval.

Format for the decremented

time.

time.

Options to control time

behavior when it's decreased

below 00:00:00.

behavior when it's decreased

below 00:00:00.

click me
### Spell Decremented Time

**Required options**

In this example, we paste a list of clock times in the input and subtract 1 minute from each time. The first clock time goes back from today to yesterday and the other times have overflow minutes (minutes counter is more than 60). The program converts all times into valid clock times and spells them in English in the output.

0:0
1:10
2:20
3:30
4:40
5:50
6:60
7:70
8:80
9:90

23 hours and 59 minutes
1 hour and 9 minutes
2 hours and 19 minutes
3 hours and 29 minutes
4 hours and 39 minutes
5 hours and 49 minutes
6 hours and 59 minutes
8 hours and 9 minutes
9 hours and 19 minutes
10 hours and 29 minutes

Set the decrement interval.

Format for the decremented

time.

time.

Options to control time

behavior when it's decreased

below 00:00:00.

behavior when it's decreased

below 00:00:00.

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/decrement-clock-time__?input__=10%3A20%3A30%0A06%3A00%3A00%0A20%3A50%3A00%0A14%3A40%3A04%0A00%3A30%3A00&interval=1%20hour&format=hh-mm-ss&time-overflow=strict-time

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Quickly visualize your life in weeks or months.

Quickly draw a wall clock that shows a particular time.

Quickly draw an electronic clock that shows a particular time.

Quickly draw a monthly calendar for any month of the year.

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 print a list of symmetric clock times (such as 05:22:50).

Quickly print a list of symmetric dates (such as 2020-02-02).

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 sort time intervals by their start time or length.

Quickly sort date intervals by their start date or length.

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.

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.

Quickly print a list of all clock times with a specific hand angle.

Quickly print all dates when a specific day happens.

Quickly find all Fridays that fall on the 13th day of the month.

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.

Quickly create a list of all Thanksgiving dates.

Quickly show useful information about a particular clock time.

Quickly show useful information about a particular calendar date.

Quickly draw a timeline of multiple time intervals.

Quickly draw a visualization of multiple date intervals.

Quickly find the time a clock shows if you look at it in a mirror.

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.

These time tools are on the way!

Draw a Binary Clock

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.

Draw a Pi Clock

Draw a π clock with π hours in a day.

Draw a 360° Clock

Draw a 360° clock with 360 degrees in a day.

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.

Draw a Sunrise and Sunset Calendar

Draw a calendar that shows when the Sun rises and sets.

Draw a Moonrise and Moonset Calendar

Draw a calendar that shows when the Moon rises and sets.

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.

Find Your Age on Other Planets

Calculate your age based on the orbital period of other planets.

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.

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.

Convert Earth Date/Time to Stardate

Convert Earth time to Star Trek's stardate.

Convert Stardate to Earth Date/Time

Convert Star Trek's stardate to Earth time.

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.

Generate Clock Emojis

Print all clock icons from 00:00 to 24:00.

Create Zalgo Time

Generate date and time that only Zalgo can understand.

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We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling our mission is to make people's lives easier, so we created this collection of time and date tools. All our tools share the same user interface, so as soon as you learn how to use one of the tools, you'll be a master of all tools. Behind the scenes, our time and date tools are actually powered by our web developer tools that we created over the last couple of years. Check them out!

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"4 hours", "1 hour 2 min 40 sec"

"10 minutes", or "05:15:40".