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Python Program for Conversion Between 12-Hour and 24-Hour Time Format

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Python programs for conversion between 12-hour and 24-hour time format have been shown here. The 12-hour time format and the 24-hour time format are two different ways of representing time.


The 12-hour time format is a system in which the day is divided into two 12-hour periods: AM / am (ante meridiem) and PM / pm (post meridiem). In ante meridiem, the hours from 1 to 12 are used to represent the time from midnight to noon, while in post meridiem the hours from 1 to 12 are used to represent the time from noon to midnight. On the other hand, the 24-hour time format is a system in which the day is divided into 24 hours. In this system, the hours from 0 to 23 are used to represent the time from midnight to midnight.


For example, 11:15 am in the 12-hour format is equivalent to 11:15 in the 24-hour format, while 11:15 pm in the 12-hour format is equivalent to 23:15 in the 24-hour format.






1. Program & Output for Conversion Between 12-Hour Time Format and 24-Hour Format




1.1. Python Program & Output to convert 12 hour time format to 24 hour format

Code has been copied
####################################
#       alphabetacoder.com
# Python program to convert 12 hour
# time format to 24 hour format
####################################


def changeTimeFormat(time):
    # Split the input into hours, minutes, and am/pm parts
    p = time.split(":")

    # get hour
    h = int(p[0])

    # get minute
    m = int((p[1].split(" "))[0])

    # get am or pm
    am_pm = (p[1].split(" "))[1]

    # copy value
    h1 = h
    m1 = m

    # Adjust the hour
    if am_pm == "am" or am_pm == "AM":  # if it is am / AM
        # if hour = 12, then it is 0 in 24 hour format
        if h1 == 12:
            h1 = 0
        # display result
        print(f"{h}:{m} a.m is same as {h1:02d}:{m1:02d} in 24-hour format")
    elif am_pm == "pm" or am_pm == "PM":  # if it is pm / PM
        # if hour not equals 12, then add 12 in 24 hour format
        if h1 != 12:
            h1 += 12
        # display result
        print(f"{h}:{m} p.m is same as {h1:02d}:{m1:02d} in 24-hour format")
    else:
        print("Wrong Input Format!")


def main():
    # take inputs
    time = input("Enter the time in 12-hour format (hh:mm am/pm): ")

    # call function to display time format in 24 hour format
    changeTimeFormat(time)


# driver code
main()

Output

Enter the time in 12-hour format (hh:mm am/pm): 2:45 am

2:45 a.m is same as 02:45 in 24-hour format





1.2. Python Program & Output to convert 24 hour time format to 12 hour format

Code has been copied
####################################
#       alphabetacoder.com
# Python program to convert 24 hour
# time format to 12 hour format
####################################


def changeTimeFormat(time):
    # Split the input into hours, minutes
    p = time.split(":")

    # get hour
    h = int(p[0])

    # get minute
    m = int(p[1])

    # copy value
    h1 = h
    m1 = m

    # Adjust the hour
    if h1 < 12:  # if hour value less than 12
        # display the result
        print(f"{h}:{m} is same as {h1:02d}:{m1:02d} a.m in 12-hour format")
    else:  # if hour value greater or equal to 12
        # subtract 12 from hour value
        h1 = h1 - 12
        print(f"{h}:{m} is same as {h1:02d}:{m1:02d} p.m in 12-hour format")


def main():
    # take inputs
    time = input("Enter the time in 24-hour format (hh:mm): ")

    # call function to display time format in 12 hour format
    changeTimeFormat(time)


# driver code
main()

Output

Enter the time in 24-hour format (hh:mm): 20:15

20:15 is same as 08:15 p.m in 12-hour format





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