How to Convert Millisecond Timestamps to Formatted Time Strings in Java?

Converting Millisecond Timestamps to String Formatted Time in Java

As a Java developer, you may encounter scenarios where you need to convert long values representing milliseconds elapsed since the Epoch (1970-01-01T00:00:00Z) into human-readable time strings in a specific format (e.g., h:m:s:ms). This arises frequently when working with timestamps from logging frameworks like log4j.

While you may attempt to use simple division or conversions, such as logEvent.timeStamp/ (1000*60*60) or TimeUnit.MILLISECONDS.toMinutes(logEvent.timeStamp), they often lead to incorrect results.

To accurately convert milliseconds to the desired time format, follow these steps:

1. Instantiate a Date object using the timestamp value: Date date = new Date(logEvent.timeStamp);
2. Create a SimpleDateFormat formatter, specifying the desired format: DateFormat formatter = new SimpleDateFormat("HH:mm:ss.SSS");
3. Set the timezone to UTC for consistent formatting: formatter.setTimeZone(TimeZone.getTimeZone("UTC"));
4. Format the Date object and store it in a string variable: String dateFormatted = formatter.format(date);

This approach ensures accurate conversion of timestamps to strings in the specified format, enabling you to display or process time-related information effectively.

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