Since the 24-hour clock is widely used, yet also widely unused.. I'll provide here a quick and easy formula to always solve the 24-hour clock 
But first, what is the 24-hour clock?The 24-hour clock is a clock system we use for example in Europe. It allows us to write (Without using AM and PM abbreviations) the exact time on any digital clock, or else. It's easy.The 12-hour clock (Standard in America) goes from 1-12.The 24-hour clock goes from 1-24.Meaning, where the 12-h clock changes "AM" to "PM", the 24-hour clock doesn't - It keeps counting till 24!That means that the first 12 hours are identically displayed, but once the clock goes OVER 12:00 AM, the 24-hour clock will display things like "13:00" and that's when you need to convert!The 24-hour clock may display 12:00 PM as either "24:00", or just plainly "00:00". This is fine, since that is the time when the clock would reset anyway and start over.
Explanation:
But first, what is the 24-hour clock?The 24-hour clock is a clock system we use for example in Europe. It allows us to write (Without using AM and PM abbreviations) the exact time on any digital clock, or else. It's easy.The 12-hour clock (Standard in America) goes from 1-12.The 24-hour clock goes from 1-24.Meaning, where the 12-h clock changes "AM" to "PM", the 24-hour clock doesn't - It keeps counting till 24!That means that the first 12 hours are identically displayed, but once the clock goes OVER 12:00 AM, the 24-hour clock will display things like "13:00" and that's when you need to convert!The 24-hour clock may display 12:00 PM as either "24:00", or just plainly "00:00". This is fine, since that is the time when the clock would reset anyway and start over.
Solution
[ Subtract the entire number by 2. Then subtract only the first digit, with 1. ](Only applies to the HOUR, not minutes etc!)(If the first digit becomes 0, it isn't needed. Remove it :wink
That's it! Do what's within those brackets, and you'll succeed!
Examples:
-------------------------Example 1--------------------------Say the clock is 23:00Minutes don't need to be converted. Let's focus on the hour: 23Step 1: Subtract the hour with 2. 23 - 2 = 21Step 2: Subtract the first digit with 121 becomes 11Result: Clock is now 11:00 (PM) - Well done! -------------------------Example 2--------------------------Say the clock is 19:00Minutes don't need to be converted. Let's focus on the hour: 19Step 1: Subtract the hour with 2. 19 - 2 = 17Step 2: Subtract the first digit with 117 becomes 07Since the first digit resulted in a ZERO, we will remove it!It becomes just: 7Result: Clock is now 7:00 (PM) - Well done!
Aka, this is how it goes:Green is AM - Red is PM1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.. and back to start!That's how the 12-hour clock counts, right?If you notice it, there are then 2 sets: AM and PM. In total, there are 24 hours in a day.But the 12-hour clock doesn't display all of them, it naturally only displays 12 and calls it a different thing when the 13th and 14th hours, etc, come..The 24-hour clock doesn't do that. It just counts honestly.1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24.. and back to start!
AlternativelyIf you really really want to, you can do it the old-fashion method instead; Just subtract the entire hour by 12 and put "PM" on the end of it.Depends on whether you prefer counting all the way down, or just take 2 digits and then a third.It's about how your mind works best :thumbsup:
