How to Format a Duration in Seconds as H:MM:SS in Java?

Formatting Duration in Java using Custom Formats

Question: How can I format a duration in seconds using a pattern like H:MM:SS in Java? Existing Java utilities are geared towards formatting time, not durations.

Solution:

To format a duration without introducing external libraries, one can utilize Java's built-in Formatter class or similar shortcuts.

For example, given an integer representing the number of seconds s:

String formattedDuration = String.format("%d:%02d:%02d", s / 3600, (s % 3600) / 60, (s % 60));

In this code:

• s / 3600 represents the number of hours in the duration.
• (s % 3600) / 60 represents the number of minutes remaining after the hours have been accounted for.
• (s % 60) represents the number of seconds remaining after the minutes have been accounted for.

The d format specifiers ensure that the minutes and seconds are always formatted with two digits, adding leading zeros as needed.

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