How do I convert milliseconds to a date in a specific format with timezone consideration in Java?

Converting Milliseconds to Date with Specified Locale

The task of converting milliseconds to date in a specific format while considering timezone differences can be accomplished with various approaches in Java. Let's explore some of them.

Java.util.Date and SimpleDateFormat

A straightforward method is to use the java.util.Date class, where millis represents the milliseconds to be converted:

<code class="java">Date date = new Date(millis);</code>

To format the date in a specific pattern, we can use SimpleDateFormat:

<code class="java">SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss,SSS", Locale.US);
String formattedDate = sdf.format(date);</code>

Java.time Package

Java SE 8 introduced the java.time package, which provides more comprehensive and modern date-time handling capabilities. Here's how to convert milliseconds using the Instant and LocalDateTime classes:

<code class="java">Instant instance = Instant.ofEpochMilli(millis);
LocalDateTime localDateTime = LocalDateTime.ofInstant(instance, ZoneId.of("Asia/Kolkata"));</code>

To format the date, we can use DateTimeFormatter:

<code class="java">DateTimeFormatter formatter = DateTimeFormatter.ofPattern("u-M-d hh:mm:ss a O");
String formattedDate = localDateTime.format(formatter);</code>

GregorianCalendar and SimpleDateFormat

Another approach utilizing GregorianCalendar and SimpleDateFormat:

<code class="java">Calendar calendar = new GregorianCalendar(TimeZone.getTimeZone("US/Central"));
calendar.setTimeInMillis(millis);

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss,SSS", Locale.US);
sdf.setCalendar(calendar);
String formattedDate = sdf.format(calendar.getTime());</code>

Joda-Time Library

The Joda-Time library offers extensive date and time manipulation capabilities. Here's how to convert milliseconds using Joda-Time's DateTime class:

<code class="java">DateTime jodaTime = new DateTime(millis, DateTimeZone.forTimeZone(TimeZone.getTimeZone("US/Central")));
String formattedDate = jodaTime.toString("yyyy-MM-dd HH:mm:ss,SSS");</code>

By considering timezone information and using appropriate date-time classes, you can now efficiently convert milliseconds to a date in the desired format, ensuring accuracy and readability in your logging and data processing applications.

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