Reading 24-hour clock time

All in One Place

Everything you need for better grades in university, high school and elementary.

Learn with Ease

Made in Canada with help for all provincial curriculums, so you can study in confidence.

Instant and Unlimited Help

Get the best tips, walkthroughs, and practice questions.

0/4
?
Intros
Lessons
  1. Introduction to Reading 24-Hour Clock Time:
  2. What is 24-hour clock time?
  3. Equivalent 24-hour times on the analog clock
  4. Comparing 12-hour times and 24-hour times in a table
  5. How to convert between 12-hour clock time (AM/PM) and 24-hour clock time
0/14
?
Examples
Lessons
  1. Converting AM/PM Time into 24-Hour Time
    Write as 24-hour time instead of AM/PM time.
    1. 9:56 AM
    2. 6:18 AM
    3. 1:35 PM
    4. 4:27 PM
    5. 12:01 AM
  2. Converting 24-Hour Time into AM/PM Time
    Write as AM/PM time instead of 24-hour time.
    1. 05:40
    2. 22:23
    3. 18:05
    4. 11:37
    5. 00:51
  3. Noon and Midnight are Special Exceptions for 24-Hour Time
    Answer the questions about special times in the day.
    1. How do you write noon and midnight in AM/PM time?
    2. How do you write noon and midnight in 24-hour time?
    3. What is the rule for all other time conversion (not noon or midnight) for AM and PM hours into 24-hour time?
  4. 24-Hour Time - True False Questions
    Read the descriptions of the time shown below. Write true (T) or false (F) for each description.

    19:45

    Time: Reading 24-Hour Clock Time
    0%
    ?
    Practice
    Topic Notes
    ?

    In this lesson, we will learn:

    • 24-hour clock time is used instead of 12-hour clock time to avoid being confused about AM or PM
    • There are 24 hours in a day, so instead of the hours being labelled 1-12 AM or 1-12 PM, we can label them from 1-24 instead.
    • There are rules for converting between 12-hour clock time and 24-hour clock time (and vice versa)

    Notes:

    • Using 12-hour clock time can be confusing because you might not know if someone is telling you a time for AM or PM (ex. is it 6 o’clock in the morning or evening?)

    • By using 24-hour clock time, we can avoid the confusion of not knowing AM/PM
      • There are 24 hours in a day
        • The previous days ends, and the new day starts at midnight (12:00 AM)
        • The middle of the day is right at noon (12:00 PM)
      • For 24-hour time, you say the hours directly from 00 until 24 (or back to 00)
    Time: Reading 24-Hour Clock Time

    • This table shows all the equivalent times for the 12-hour clock and 24-hour clock:
    Time: Reading 24-Hour Clock Time

      • When it goes to midnight (12AM), it becomes 24:00 which is the same as 00:00
      • Do not use this table when doing the practice questions; only for checking

    • To convert from AM/PM time (12-hour clock time) to 24-hour time:

    • \qquad 1. Minutes: stay the same
      \qquad 2. Hours:
        • if AM, keep the same (add leading 0)
        • if PM add 12

      \qquad 3. Exceptions: 12AM = 00h, 12PM = 12h
      • Ex. (8:46AM = 08:46), (5:13PM = 17:13), (12:07AM = 00:07)

    • To convert from 24-hour time to AM/PM time :

    • \qquad 4. Minutes: stay the same
      \qquad 5. Hours
        • if < 12, keep same, remove leading 0, and write AM
        • if > 12 subtract 12 and write PM

      \qquad 6. Exceptions: 00:00 = 12AM and 12:00 = 12PM
      • Ex. (09:54 = 9:54AM), (22:38 = 10:38PM), (00:16 = 12:16AM)