java取db时间差12小时


import java.time.Duration;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;

public class TimeDifferenceExample {
    public static void main(String[] args) {
        LocalDateTime dateTime1 = LocalDateTime.parse("2022-01-01T12:00:00");
        LocalDateTime dateTime2 = LocalDateTime.parse("2022-01-02T00:00:00");

        Instant instant1 = dateTime1.atZone(ZoneId.systemDefault()).toInstant();
        Instant instant2 = dateTime2.atZone(ZoneId.systemDefault()).toInstant();

        Duration duration = Duration.between(instant1, instant2);

        long diffInHours = duration.toHours();
        
        if (diffInHours == 12) {
            System.out.println("时间差为12小时");
        }
    }
}

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