How to Convert a Millisecond Timestamp to HH:mm:ss:SSS Format in Java?

Converting Millisecond Timestamp to Formatted Time in Java

In Java, converting a timestamp represented as a long value (milliseconds elapsed since Epoch) to a formatted time string in the h:m:s:ms format is a straightforward process.

To achieve this, you can utilize the Date and SimpleDateFormat classes. The Date class represents a specific instant in time, while SimpleDateFormat allows you to format that time according to a given pattern.

Below is a step-by-step solution to your problem:

// Create a Date object from the timestamp
Date date = new Date(logEvent.timeStamp);

// Create a SimpleDateFormat object with the desired time format
DateFormat formatter = new SimpleDateFormat("HH:mm:ss.SSS");

// Set the SimpleDateFormat time zone to UTC for correct time formatting
formatter.setTimeZone(TimeZone.getTimeZone("UTC"));

// Format the Date object and convert it to a string
String dateFormatted = formatter.format(date);

// Display the formatted time string
System.out.println(dateFormatted); // Prints time in h:m:s:ms format

This approach ensures accurate conversion of the timestamp to the desired formatted time string.

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