How to use UTC+8 for global settings in springboot project

In the Spring Boot project, all time-related operations in Java are globally set to use the UTC 8 time zone, which can be achieved by the following methods:

First, set java.util when the Spring Boot application starts Default time zone in package:

import java.util.TimeZone;

@SpringBootApplication
public class MyApplication {
    public static void main(String[] args) {
        // 设置默认时区为 UTC+8
        TimeZone.setDefault(TimeZone.getTimeZone("UTC+8"));
        SpringApplication.run(MyApplication.class, args);
    }
}

This will cause time operations based on both java.util.Date and java.util.Calendar to use the UTC 8 time zone.

With the new date and time API in Java 8 (located in the java.time package), you can create a global ZoneId instance and then use this instance in your code. You can create a global ZoneId instance in the following way:

Create a file named GlobalZoneId.java in the src/main/java/com/example/yourpackage/ directory and add the following content to it:

package com.example.yourpackage;

import java.time.ZoneId;

public class GlobalZoneId {
    public static final ZoneId ZONE_ID = ZoneId.of("UTC+8");
}

Then, in your project, whenever you need to use the time zone, use GlobalZoneId.ZONE_ID directly, for example:

import java.time.ZonedDateTime;
import java.time.Instant;
import com.example.yourpackage.GlobalZoneId;

public class MyClass {
    public static void main(String[] args) {
        Instant instant = Instant.now();
        ZonedDateTime zonedDateTime = instant.atZone(GlobalZoneId.ZONE_ID);
    }
}

This way, you can ensure that all time-related operations use UTC 8 time zone. However, please note that this approach requires you to always use GlobalZoneId.ZONE_ID when a time zone is required. You need to be consistent and follow this convention throughout your projects.

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