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12 hour to 24 hour converter

World's simplest time tool

With this browser-based application, you can convert time from a 12-hour system to a 24-hour system. Given one or more 12-hour clock times in the range 0-12 with the am/pm time-of-the-day indicators, it converts them to the 00-24 format. It can also pad hours, minutes, and seconds with a zero to make them two digits long and in case of missing seconds or minutes, add them back. Created by computer nerds from team Browserling.
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24hr Clock Format
Use full 24hr format and always display hours, minutes, and seconds.
24hr Clock Padding
Add zero padding to hours, minutes, and seconds to make them two digits long.
12 hour to 24 hour converter tool What is a 12 hour to 24 hour converter?
This is a quick online program for changing the 12-hour time format to the 24-hour time format. It parses all the input time values one-by-one and if a value contains the "am" abbreviation, then it knows that this clock time is from 0-12 (night/morning), but if a value contains the "pm" abbreviation, then this time is from 12-24 (afternoon/evening). If there is no "am" or "pm" symbol, then it's "am" time. If it's "pm" time, then the utility simply adds 12 hours to each clock time and removes the "pm" abbreviation. For example, 2:00pm is converted to 14:00 and 2:00am is converted to 2:00. The program supports full double-digit time format for hours, minutes, and seconds (HH:MM:SS) and non-full time format (H:M:S). In the output, you can preserve the original time format, add zero-padding to single-digit time units, and if the input time doesn't include minutes or seconds, add zero time units in their place. Timeabulous!
12 hour to 24 hour converter examples Click to use
Hours to 24hr Format
In this example, we load a list of 12-hour time values that only have the hours component. The hour values with the same magnitude but different am/pm indicators are grouped together to show how the time values change when they are converted to the 24-hour format. We pad output times with zeros and add the missing zero minutes and zero seconds to the hours to get the full time format HH:MM:SS.
1am 1pm 2am 2pm 3am 3pm 5am 5pm 6am 6pm
01:00:00 13:00:00 02:00:00 14:00:00 03:00:00 15:00:00 05:00:00 17:00:00 06:00:00 18:00:00
Required options
These options will be used automatically if you select this example.
Use full 24hr format and always display hours, minutes, and seconds.
Add zero padding to hours, minutes, and seconds to make them two digits long.
24 Hour HH:MM Format
This example converts five clock times in "H:M A.M./P.M." format to the "HH:MM" 24-hour format. To convert the P.M. values to 24-hour format, it adds 12 hours to each "H" value. The A.M. values are not changed as on both 12-hour and 24-hour clocks the hours are equal. To output the time in "HH:MM" format, the padding option is activated.
4:50 P.M. 9:1 A.M. 9:1 P.M. 10:50 A.M. 11:59 P.M.
16:50 09:01 21:01 10:50 23:59
Required options
These options will be used automatically if you select this example.
Use full 24hr format and always display hours, minutes, and seconds.
Add zero padding to hours, minutes, and seconds to make them two digits long.
Preserve Time Format
In this example, we enter multiple clock times in H:M:S, H:M, and H formats with different am/pm indicators. As we have disabled both options, the conversion algorithm preserves the input time format and doesn't change it in the output. Hours stay hours, hours:minutes stay hours:minutes, and hours:minutes:seconds stay hours:minutes:seconds.
1am 1pm 1:1am 1:1pm 1:1:1am 1:1:1pm
1 13 1:1 13:1 1:1:1 13:1:1
Required options
These options will be used automatically if you select this example.
Use full 24hr format and always display hours, minutes, and seconds.
Add zero padding to hours, minutes, and seconds to make them two digits long.
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/convert-12hr-to-24hr?input=1am%0A1pm%0A%0A2am%0A2pm%0A%0A3am%0A3pm%0A%0A5am%0A5pm%0A%0A6am%0A6pm&full-time=true&padding=true
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Calculate how many seconds have passed since midnight.
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Calculate how many seconds are left till midnight.
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Find the reverse of the given clock time.
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Find the inverse of the given clock time.
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Drop seconds, minutes or hours from the given clock time.
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Round the given clock time up or down.
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Add hours, minutes, and seconds to the given time.
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Subtract hours, minutes, and seconds from the given time.
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Add days, months, and years to the given date.
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Subtract days, months, and years from the given date.
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Split the given time into multiple intervals.
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Generate a list of equal or unequal time intervals.
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.
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Print a list of all leap years.
Find Common Years
Print a list of all common years.
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