# Clock time decrementer

## World's simplest time tool

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.

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Clock time decrementer tool
What is a clock time decrementer?

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!

Clock time decrementer examples
Click to use

Set Clocks Back by One Hour

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

**Required options**

Set the decrement interval.

Decrement 12-hour Time

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

**Required options**

Set the decrement interval.

Decrease the Time by More than a Day

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

**Required options**

Set the decrement interval.

Decrease Time Within One Day

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

**Required options**

Set the decrement interval.

Spell Decremented Time

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

**Required options**

Set the decrement interval.

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/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
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.

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