In normal work, it is inevitable that you will encounter the difference in days, hours, minutes, seconds, and milliseconds between two times. Now I summarize the methods I obtain as follows:

1. Import the required dependencies

<dependency>
        <groupId>cn.hutool</groupId>
        <artifactId>hutool-all</artifactId>
        <version>4.6.10</version>
</dependency>

2. Description of the method

## How many days is the difference between date1 and date2
DateUtil.between(date1, date2, DateUnit.DAY);
## How many hours is the difference between date1 and date2
DateUtil.between(date1, date2, DateUnit.HOUR);
## How many minutes is the difference between date1 and date2
DateUtil. between(date1, date2, DateUnit. MINUTE);
## How many seconds is the difference between date1 and date2
DateUtil. between(date1, date2, DateUnit. SECOND);
## How many milliseconds is the difference between date1 and date2
DateUtil.between(date1, date2, DateUnit.MS);

3. Method testing

public class DateTest {
     public static void main(String[] args) {
         Date data1 = DateUtil. parse("2022-09-07 12:23:25");
         Date date2 = DateUtil. parse("2022-09-07 18:23:25");
         System.out.println("Difference between two times "+DateUtil.between(data1, date2, DateUnit.DAY)+" days");
         System.out.println("Difference between two times "+DateUtil.between(data1, date2, DateUnit.HOUR)+" hours");
         System.out.println("Difference between two times "+DateUtil.between(data1, date2, DateUnit.MINUTE)+" minutes");
         System.out.println("Difference between two times "+DateUtil.between(data1, date2, DateUnit.SECOND)+" seconds");
         System.out.println("Difference between two times "+DateUtil.between(data1, date2, DateUnit.MS)+" milliseconds");
     }
}

Fourth, the console output is as follows

There is a difference of 0 days between the two times
6 hours difference between the two times
The difference between the two times is 360 minutes
The difference between the two times is 21600 seconds
The difference between the two times is 21600000 milliseconds

5. Method extension

## Convert string time to Date type output: 2022-09-07 12:23:25
DateUtil. parse("2022-09-07 12:23:25");
## Convert Date type to string time Output: 2022-09-07 16:42:05
DateUtil. format(new Date(), "yyyy-MM-dd HH:mm:ss");