Java uses Joda Time for time zone conversion

Joda Time is a Java date and time processing class library, which is used to replace the date and time classes in the Java Standard library. It has a simpler and easier to use API, supports handling time in different time zones, and provides some convenient methods for calculating and manipulating dates and times. Firstly, we need to add the Joda Time dependency in the Maven configuration file of the project: <dependency> <groupId>joda-time</groupId> <artifactId>joda-time</artifactId> <version>2.10.12</version> </dependency> Next, let's implement a simple example of converting the time of one time zone to the time of another time zone. Assuming we have a time string and a representative string of two time zones, we want to convert that time from one time zone to another. import org.joda.time.DateTime; import org.joda.time.DateTimeZone; import org.joda.time.format.DateTimeFormat; import org.joda.time.format.DateTimeFormatter; public class TimeZoneConversionExample { public static void main(String[] args) { //Input time string String dateTimeString = "2021-01-01T00:00:00"; //Enter the time zone of the time string DateTimeZone inputTimeZone = DateTimeZone.forID("America/Los_Angeles"); //Target Time Zone DateTimeZone outputTimeZone = DateTimeZone.forID("Asia/Tokyo"); //Create Joda Time object for input time DateTime inputDateTime = DateTime.parse(dateTimeString, DateTimeFormat.forPattern("yyyy-MM-dd'T'HH:mm:ss").withZone(inputTimeZone)); //Time converted to target time zone DateTime outputDateTime = inputDateTime.withZone(outputTimeZone); //Output Results System. out. println ("Input time:"+inputDateTime); System. out. println ("Output time:"+outputDateTime); } } In the above code, we used Joda Time's DateTime class to represent a time object and the DateTimeZone class to represent different time zones. Firstly, we parse the input time string through the DateTimeFormatter and specify the input time zone. Then, use the withZone method to convert the time object to the time of the target time zone. Finally, print out the input and output times through the output statement. Finally, to summarize, we can easily achieve time conversion between time zones by adding Joda Time's Maven dependency and using its provided DateTime and DateTimeZone classes. At the same time, using Joda Time can avoid some issues that exist in Java standard date and time classes, and provide a simpler and more user-friendly API.