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There are a lot of topics on forums in what case Japanese people use 24-hour
clock format. But I have never seen how it should be pronounced. It's not hard
to say something like 8:05. This is common and sounds like 「はちじ ごふん」, but how
will it be if I want to read 15:40 or 19:20 etc. I didn't hear anything like
「じゅうごじ よんじゅっぷん」 and I'm confused how it should be read.

Is it usual for Japanese people to translate 24 format into 12, or are there
any edge cases they would use 24 strictly?
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2017-03-01T09:45:06.997
43981
2019-08-22T07:41:05.097
2019-08-22T07:41:05.097
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usage counters numbers time daily-life
How to read 24-hour clock format
You can read the time of day in 24-hour format using the pronunciation for the
numbers 13–24 as for the numbers 1–10 followed by 時【じ】, e.g.

> 15:40 = 15時40分 = じゅうごじ よんじゅっぷん  
>  19:20 = 19時20分 = じゅう **く** じ にじゅっぷん

In particular, exceptions to the usual readings are the same

> 4時 = **よ** じ → 14時 = じゅう **よ** じ, 24時 = にじゅう **よ** じ  
>  7時 = **しち** じ → 17時 = じゅう **しち** じ  
>  9時 = **く** じ → 19時 = じゅう **く** じ

The same applies for higher numbers, e.g.

> 34時間 = さんじゅうよじかん.

For 0 you use 零【れい】, so

> 0:15 = 0時15分 = れいじじゅうごふん
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2017-03-01T10:21:11.503
43982
2017-03-01T13:13:00.400
2020-06-17T08:18:27.500
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