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Home>Blog>2020 Blog Post(s)>Convert 12 hour time to 24 hour time(military time)

Blog: 1 Date: 2020-12-27

Welcome, Firstly, I will talk about why I am making this, then I will talk about the actual process. Also, this is how I convert time.

I am making this because of these reasons:

  1. I told someone I was going to write about this.
  2. I believe that military time is better overall because you do not have to clarify PM or AM, so there is no confusion (although you still have to worry about time zones).
  3. It is easy for me personally to convert to 12-hour time and vice versa.
  4. People often ask me about it, and I would like to be able to give them a link or read from this page instead of having to remember all of it on the spot.
  5. For future reference.

To convert 12-hour time to 24-hour time, add the hour and 12. An example is 5 PM; because we add the hour, which is 5, we do simple math, which would be 5+12=17:00. So here is how to convert that to 12-hour style: Now that we have the military time, we can just minus 2 hours and ignore the 1. So to convert it back, it would be 17-2=15, so now we remove the one, and we get five which we would know is PM cause it is past 12:59.

To convert 24 hours to 12 hours, you subtract 12 hours. So, for example, 21:00 minus ten would be 11:00, then remove 2 hours, and it would be nine, and we would know it is PM cause it was above 12:59. So this is how you convert it back to military time: If the time was 9 PM, you could add the hour, which would be 9 in this case, then 12. So it would be 9+12=21:00.

Bonus tip

After a while, I don't need to do much math because, for example, if military time is 23:00, I subtract two from the hour. So, it would then be 21:00, and I know that it is 11 PM because I ignore the two and replace it with a 1. The reason for this is that the 12-hour clock only goes to a maximum of 12 when in double digits, so I know that the first digit in a double-digit segment won't be a two on 12-hour time.