CODEWITHSUNDEEP
javadatetime-formatdatetimeformattertimeofday
THM
THM

Reputation: 671

How to change time format in Java - "am/pm" vs. "AM/PM"

Tests created previously use DateTimeFormatter.ofPattern("ha"); and returns "10AM" (for '2017-04-09T10:00-06:00[US/Mountain]').

Under my MacOs and Java ['openjdk version "11.0.12"'] I got "10am"

"10AM" != "10am"

In specification I see "ha" should create "10AM" not "10am" see: https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html

Any advice?

Upvotes: 4

Views: 3965

Answers (2)

THM
THM

Reputation: 671

-Duser.timezone=EDT
-Duser.country=US
-Duser.language=en-US

solved issue

Upvotes: 1

Arvind Kumar Avinash
Arvind Kumar Avinash

Reputation: 79015

DateTimeFormatter is a Locale-sensitive type i.e. its parsing and formatting depend on the Locale. Check Never use SimpleDateFormat or DateTimeFormatter without a Locale to learn more about it.

If you have an English Locale, and you want the output to be always in a single case (i.e. upper case), you can chain the string operation with the formatted string e.g.

import java.time.LocalTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        System.out.println(
                LocalTime.now(ZoneOffset.UTC)
                    .format(DateTimeFormatter.ofPattern("ha", Locale.ENGLISH))
                    .toUpperCase()
        );
    }
}

Output from a sample run:

6AM

ONLINE DEMO

Learn more about the modern Date-Time API* from Trail: Date Time.

* If you are working for an Android project and your Android API level is still not compliant with Java-8, check Java 8+ APIs available through desugaring. Note that Android 8.0 Oreo already provides support for java.time.

Upvotes: 9

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