What time is 21:42?

21:42 = 9:42 PM

21:42 on a 24-hour clock is is 9:42 PM on a 12-hour clock. This system is used throughout the world (not just the military) and leverages a 24-hour time clock rather than the 12-hour AM/PM system known to most English speaking countries. Below are ways to convert 21:42 through a time chart, automated converter, and how to convert the 24 hour clock into a 12-hour AM/PM system by hand.

24-hour format 12-hour format
21:42 9:42 PM
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21:42 Time Conversion Chart

24 Hour Clock 12 Hour Clock (AM/PM) Military Time
21:42 21:42 2142
21:47 21:47 2147
21:52 21:52 2152
21:57 21:57 2157
22:02 22:02 2202
22:07 22:07 2207
22:12 22:12 2212
22:17 22:17 2217
22:22 22:22 2222
22:27 22:27 2227
22:32 22:32 2232
22:37 22:37 2237
22:42 22:42 2242
22:47 22:47 2247
22:52 22:52 2252
22:57 22:57 2257

How to convert 21:42 from 24-Hour Time to 12-Hour Standard Time

It is easy to convert from 24-hour time to 12-hour time once you know a few tricks. The primary difference between the two is that the hours in a 24 hour clock go all the way up to 23 (from 0 to 23). In a 12-hour clock, the hour resets to 1 after noon (midday). Follow the steps below to convert 21:42 to 12-hour time.

  1. First, determine whether or not 21 is greater than 12 (recall that this is one of the distinctions of the 12-hour clock, there are no hours "greater" than 12 on it)
  2. The hour 21 is higher than twelve, so we need to subtract 12 from 21 to get our "PM" hour: 21 - 12 = 9
  3. Now add "PM" to the end of the time: 9:42 PM