全局时间格式设置

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If we want to configure a default format for all dates in our application, a more flexible way is to configure it in application.properties:

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spring.jackson.date-format=yyyy-MM-dd HH:mm:ss

And if we want to use a specific time zone in our JSON dates, there's also a property for that:

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spring.jackson.time-zone=Europe/Zagreb

Although setting the default format like this is quite handy and straightforward, there's a drawback to this approach. Unfortunately, it doesn't work with the Java 8 date types, like LocalDate and LocalDateTime – we can use it only to format fields of the type java.util.Date or the java.util.Calendar. There is hope, though, as we'll soon see.

参考：https://www.baeldung.com/spring-boot-formatting-json-dates

平常项目使用：时间类型设置成Date，返回给前端的时间格式会自动转换

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spring:
  jackson:
    date-format: yyyy-MM-dd HH:mm:ss
    time-zone: GMT+8