Practical Guide to Solving the Problem of Inconsistency in Front-end and Back-end Time

Preface

A common reason for inconsistency between front-end and back-end time is time zone differences. The time generated in the backend code may be based on the system default time zone (such as UTC), while the frontend may interpret the time in a different time zone environment. Therefore, during the time transmission process, it is necessary to ensure consistency and correct processing of time zone information.

When you're inWhen adding the following content to the configuration file:

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

You are actually doing the following two things:

• Set the date format uniformly toyyyy-MM-dd HH:mm:ss。
• Set the default time zone toGMT+8(China Standard Time, i.e. CST).

Why are there problems with inconsistent time?

In application development, time processing is an often overlooked but actually very complex issue. The problem of inconsistent time between front-end and back-end is usually caused by time zone differences. Common reasons include:

• System time zone settings: The time generated by the backend code may use the system default time zone (such as UTC), while the frontend will display different times under different time zones.
• Serialization and deserialization time zone processing: Different systems, languages, and libraries may use different time zones by default when dealing with time serialization and deserialization.

Solve time zone issues through configuration

In order to unify the time format and time zone, you can use the Spring Boot project’sThe following content is set in the configuration file:

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

Configuration example:

Configuration instructions:

• -format: Set the date format toyyyy-MM-dd HH:mm:ss, ensure the format is unified.
• -zone: Set the time zone toGMT+8(Chinese Standard Time, i.e. CST), ensuring that time uses a consistent time zone when serializing and deserializing.

Through these configurations, when serializing and deserializing datetime objects through Jackson, the default format and time zone will be given to the specified format and time zone, which solves the problem of inconsistent time before and after the front and back ends.

Sample code implementation

1. Entity Class

We create a simple entity classUserStationLetterListTO, which contains oneDateField.

import ;

public class UserStationLetterListTO {
    private Date created;

    public UserStationLetterListTO(Date created) {
         = created;
    }

    public Date getCreated() {
        return created;
    }

    public void setCreated(Date created) {
         = created;
    }
}

2. Controller

Next, let’s look at a simple Spring Boot controller that returns the current time.

import ;
import ;

import ;

@RestController
public class TimeController {

    @GetMapping("/time")
    public UserStationLetterListTO getTime() {
        return new UserStationLetterListTO(new Date());
    }
}

3. Main program application class

Finally, there is the main program application class, which is used to start the Spring Boot application.

import ;
import ;

@SpringBootApplication
public class TimeApplication {
    public static void main(String[] args) {
        (, args);
    }
}

Verify configuration effect

Make sure to be inThe file contains the following configuration:

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

Test steps:

• Launch the Spring Boot app.
• Visithttp://localhost:8080/time。

likeThe configuration is correct, you will see the return time asyyyy-MM-dd HH:mm:ssformat, and the time zone is CST. Without these configurations, you may see the default UTC time formatting and time zone.

Summarize

ByConfigure Jackson's date format and time zone in the file, and you can ensure that you use consistent time format and time zone during serialization and deserialization. This not only solves the problem of inconsistent time between front and back ends, but also avoids various time calculation errors caused by improper time zone processing. Hope this article helps you understand and resolve common problems in time processing.

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