Converting 24hour time to 12hour time?

Question

Hello I am using an android application and I am trying to figure out how to convert a 24 hour time to a 12hour time.

Example 
24 hour format 12:18:00

to 
12 hour format 12:18pm

How are you getting this time value? Plain string? date/time/object? timestamp? — Marc B, Nov 10 '11 at 15:06
plain text, sorry that i didnt state it format is in 12:18:00 — ericlee, Nov 10 '11 at 15:22

score 15 · Accepted Answer · edited Apr 01 '15 at 10:59

15

Try using a SimpleDateFormat:

String s = "12:18:00";
DateFormat f1 = new SimpleDateFormat("HH:mm:ss"); //HH for hour of the day (0 - 23)
Date d = f1.parse(s);
DateFormat f2 = new SimpleDateFormat("h:mma");
f2.format(d).toLowerCase(); // "12:18am"

edited Apr 01 '15 at 10:59

Yedhu Krishnan

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answered Nov 10 '11 at 15:10

maerics

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make sure you are writing h not H – Ovidiu Latcu Nov 10 '11 at 15:28
1

There is a bug while converting 12:00noon. Both AM and PM is reported as AM when the time is between 12:00 and 12:59 – Magesh khanna Jul 02 '14 at 18:25
Any fix for bug that Magesh mentioned? – Muhammad Babar Feb 08 '15 at 17:55
Yaa.. To fix the bug, use `DateFormat f1 = new SimpleDateFormat("HH:mm:ss");` – Yedhu Krishnan Apr 01 '15 at 09:51
FYI, the classes shown here are poorly-designed and troublesome, now legacy, supplanted by the *java.time* classes. – Basil Bourque Mar 17 '18 at 07:21

score 3 · Answer 2 · answered Mar 16 '18 at 17:49

3

If you are using Java 8 or 9 you can use java.time library like this :

String time = "22:18:00";
String result = LocalTime.parse(time).format(DateTimeFormatter.ofPattern("h:mma"));

Output

10:18PM

answered Mar 16 '18 at 17:49

YCF_L

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2

This is the modern way and the recommended one in 2018. On not-brand-new Android it works too when you add ThreeTenABP to your Android project and make sure you import the date-time classes from `org.threeten.bp` with subpackages. See [this question: How to use ThreeTenABP in Android Project](https://stackoverflow.com/questions/38922754/how-to-use-threetenabp-in-android-project). – Ole V.V. Mar 16 '18 at 20:09
Thank you @OleV.V. happy to hear all this information, always learn from you – YCF_L Mar 16 '18 at 20:12

score 0 · Answer 3 · edited Jun 25 '13 at 05:47

0

Use SimpleDateFormat but note that HH is different from hh.

Say we have a time of 18:20

The format below would return 18:20 PM

SimpleDateFormat sdf = new SimpleDateFormat("HH:mm aa");

While this format would return 6:20 PM

SimpleDateFormat sdf = new SimpleDateFormat("hh:mm aa");

Hope this helps...

edited Jun 25 '13 at 05:47

Ankur

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answered Jun 25 '13 at 05:26

Philip

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score 0 · Answer 4 · answered Mar 18 '16 at 12:35

final String timein24Format = "22:10";

try {
    final SimpleDateFormat sdf = new SimpleDateFormat("H:mm");
    final Date dateObj = sdf.parse(timein24Format );
    String timein12Format=new SimpleDateFormat("K:mm a").format(dateObj));
} catch (final ParseException e) {
    e.printStackTrace();
}

score 0 · Answer 5 · answered Nov 10 '11 at 15:09

0

You'll most likely need to take a look at Java SimpleDateFormat.

To display the data in the format you want you should use something like this:

   SimpleDateFormat sdf=new SimpleDateFormat("h:mm a");
   sdf.format(dateObject);

answered Nov 10 '11 at 15:09

Ovidiu Latcu

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score -1 · Answer 6 · answered Dec 10 '12 at 07:15

try this code

     String s= time ;

     DateFormat f1 = new SimpleDateFormat("kk:mm");
     Date d = null;
        try {
             d = f1.parse(s);
             DateFormat f2 = new SimpleDateFormat("h:mma");
             time = f2.format(d).toUpperCase(); // "12:18am"

    } catch (ParseException e) {

        // TODO Auto-generated catch block
            e.printStackTrace();
        }

Converting 24hour time to 12hour time?

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