How to Convert Timestamp in Milliseconds to Human-Readable Time in Java?

Convert Timestamp in Milliseconds to Human-Readable Time in Java

When working with timestamps, it's often necessary to convert them from their raw format (number of milliseconds elapsed from the Epoch) into a more readable string representation. In particular, we may want to convert a long timestamp into a formatted time string with hours, minutes, seconds, and milliseconds.

To achieve this conversion in Java, consider the following approach:

long timestamp = 1200; // Example timestamp in milliseconds

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

// Create a SimpleDateFormat object to format the date
SimpleDateFormat formatter = new SimpleDateFormat("HH:mm:ss.SSS");

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

// Format the date and store it in a string
String formattedTime = formatter.format(date);

// Print the formatted time
System.out.println(formattedTime);

This code will produce the output "00:00:01.200" for the input timestamp of 1200 milliseconds. The SimpleDateFormat class allows for customization of the output format string to meet your specific requirements. For example, "hh:mm:ss a" would format the time as "12:00:00 PM".

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