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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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Time Decrement Interval
Set the decrement interval.
Decrement interval examples: "4 hours", "1 hour 2 min 40 sec" "10 minutes", or "05:15:40".
Decremented Time Format
Format for the decremented time.
Time Underflow
Options to control time behavior when it's decreased below 00:00:00.
Try the examples and read the tool summary to learn what these modes do.
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
These options will be used automatically if you select this example.
Set the decrement interval.
Format for the decremented time.
Options to control time behavior when it's decreased below 00:00:00.
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
These options will be used automatically if you select this example.
Set the decrement interval.
Format for the decremented time.
Options to control time behavior when it's decreased below 00:00:00.
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
These options will be used automatically if you select this example.
Set the decrement interval.
Format for the decremented time.
Options to control time behavior when it's decreased below 00:00:00.
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
These options will be used automatically if you select this example.
Set the decrement interval.
Format for the decremented time.
Options to control time behavior when it's decreased below 00:00:00.
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
These options will be used automatically if you select this example.
Set the decrement interval.
Format for the decremented time.
Options to control time behavior when it's decreased below 00:00:00.
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
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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.