How Do I Set a Specific Time Zone for a Java Date Object?

Modifying Time Zone of a Date Object in Java

Problem:

When parsing a java.util.Date from a string without explicit timezone information, the system's local time zone is automatically assigned to the resulting Date object. This may not be desirable in cases where a specific time zone needs to be specified.

Solution:

To set a custom time zone for a Date object, you can use the DateFormat class. Here's an example using SimpleDateFormat:

SimpleDateFormat isoFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
isoFormat.setTimeZone(TimeZone.getTimeZone("UTC"));
Date date = isoFormat.parse("2010-05-23T09:01:02");

In this example:

1. A SimpleDateFormat object (isoFormat) is created to parse the string into a Date object.
2. The time zone of the SimpleDateFormat object is set to "UTC" using TimeZone.getTimeZone("UTC").
3. The string "2010-05-23T09:01:02" is parsed into a Date object using isoFormat.parse().
4. The Date object now has a time zone of UTC, regardless of the system's local time zone.

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