How to customize the HH:mm format in Java

Question

I am using HH:mm format to print the hour and minute in java. It will give the time in format 05:12, 00:04. But my requirement is to get with single digit hours:

05:12 => 5:12
00:04 => 0:04  
10:18 => 10:18

Below i have the code which i am running to produce the date,

import java.time.LocalTime;
import java.time.format.DateTimeFormatter;

public class TestDateUtil {

    public static void main(String ar[]) {
        LocalTime time = LocalTime.now();
        String t = time.format(DateTimeFormatter.ofPattern("HH:mm"));
        System.out.println(t);  

    }
}

I know that i can use string operations to make the time split on the basis of : and then change that, but that too need a lot more variations of conditions checking which i don't want to do. Is there any way of doing it?

Have you looked at javadoc and especially possible patterns? — Gaël J, Jul 09 '21 at 17:43
Are you trying to remove leading zeros? Have you looked at https://stackoverflow.com/questions/61000127/how-to-remove-leading-zero-from-timehours? — General Grievance, Jul 09 '21 at 17:45
@Calculuswhiz: Formatting it in a way that deliberately *includes* leading zeroes, then removing them, seems like it's not the best way to proceed... — Jon Skeet, Jul 09 '21 at 17:52
@JonSkeet I guess I wasn't clear on that comment. I agree with you. The question I linked to has answers that do that. I guess I should have flagged as duplicate then. — General Grievance, Jul 09 '21 at 18:40

QBrute · Answer 1 · 2021-07-09T17:58:17.850

The docs for DateTimeFormatter say:

Number: If the count of letters is one, then the value is output using the minimum number of digits and without padding. Otherwise, the count of digits is used as the width of the output field, with the value zero-padded as necessary. The following pattern letters have constraints on the count of letters. Only one letter of 'c' and 'F' can be specified. Up to two letters of 'd', 'H', 'h', 'K', 'k', 'm', and 's' can be specified. Up to three letters of 'D' can be specified.

So simply change your pattern from HH:mm to H:mm.

score 0 · Answer 2 · answered Jul 09 '21 at 17:45

0

DateTimeFormatter.ofPattern("H:mm").format(LocalTime.now())

answered Jul 09 '21 at 17:45

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How to customize the HH:mm format in Java

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