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I am working on an application where I need to calculate the elapsed time between two time stamps which are stored in the database in the format '2018-03-29T09:54:31+05:30'. The time stamp is of type TIMESTAMP WITH TIME ZONE in Postgres DB and I am using Hibernate for ORM and Spring boot for the application framework.
I have created a pojo class like below with JPA annotations and it is able to persist the object into DB successfully.

java
@Entity
@Table(name = "test")
public class Test implements Serializable {

private static final long serialVersionUID = -1696559289659951778L;

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "test_time_stamp") @Type(type="timestamp-with-timezone") private LocalDateTime testTimeStamp;
public Test() {
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public LocalDateTime getTestTimeStamp() {
return testTimeStamp;
}
public void setTestTimeStamp(LocalDateTime testTimeStamp) {
this.testTimeStamp = testTimeStamp;
}
@Override
public String toString() {
return "Test [id=" + id + ", testTimeStamp=" + testTimeStamp + "]";
}
}

Now I am trying to calculate the elapsed time between two time stamps which are retrieved from DB and I am getting them in the same format.

For example:
2018-03-29T09:54:31+05:30
2018-03-29T10:00:31+05:30

When I am trying to subtract these two objects using localDateTime1 - localDateTime2, it is throwing java.time.DateTimeException saying that Cannot subtract due to different offsets. I know that the reason for this exception is that I am storing LocalDateTime in my pojo class but I have no control over this because it was written by someone else before me.

I want to know what would be the best way to resolve this issue without changing my pojo class and without having any side effect on my existing code?
<|end|> assistantTo resolve the issue of calculating elapsed time between timestamps with different offsets without changing your existing POJO class or affecting other parts of your codebase, you can follow these steps: ### Steps to Calculate Elapsed Time 1. **Convert `LocalDateTime` to `OffsetDateTime`:** Since your timestamps include timezone information (offset), you should first convert them to `OffsetDateTime`. This will allow you to handle the offsets properly. 2. **Calculate Duration Between Two `OffsetDateTime` Objects:** Once converted to `OffsetDateTime`, you can easily calculate the duration between them using `java.time.Duration`. Here's how you can implement these steps: java import java.time.LocalDateTime; import java.time.OffsetDateTime; import java.time.ZoneOffset; import java.time.Duration; public class TimeDifferenceCalculator { public static void main(String[] args) { // Example timestamps LocalDateTime localDateTime1 = LocalDateTime.parse("2018-03-29T09:54:31"); LocalDateTime localDateTime2 = LocalDateTime.parse("2018-03-29T10:00:31"); // Assume offset is +05:30 for both timestamps OffsetDateTime offsetDateTime1 = localDateTime1.atOffset(ZoneOffset.of("+05:30")); OffsetDateTime offsetDateTime2 = localDateTime2.atOffset(ZoneOffset.of("+05:30")); // Calculate duration Duration duration = Duration.between(offsetDateTime1, offsetDateTime2); // Output the duration in seconds or any other unit System.out.println("Elapsed time in seconds: " + duration.getSeconds()); System.out.println("Elapsed time in minutes: " + duration.toMinutes()); System.out.println("Elapsed time in hours: " + duration.toHours()); } } ### Explanation - **Convert to `OffsetDateTime`:** Use `atOffset(ZoneOffset.of("+05:30"))` to convert `LocalDateTime` to `OffsetDateTime`. This step ensures that the timezone information is preserved. - **Calculate Duration:** Use `Duration.between()` to calculate the difference between two `OffsetDateTime` objects. This method correctly handles any differences in offsets. ### Benefits - **No Changes to POJO:** You don't need to modify your existing POJO class. - **No Side Effects:** This approach only affects how you handle timestamps for calculating durations and doesn't impact other parts of your application. - **Correct Handling of Offsets:** By using `OffsetDateTime`, you ensure that timezone differences are correctly accounted for. This approach allows you to work around the limitations of using `LocalDateTime` for timestamps with timezone information while maintaining compatibility with your existing codebase.