CODEWITHSUNDEEP
javadatetime
user12601909
user12601909

Reputation:

Get milliseconds between two times

This question has probably been answered before. But here I go.

I have a String object with value "21:48" and another String object with value "23:23". How can I calculate the milliseconds between these two times?

Upvotes: 0

Views: 2613

Answers (3)

Glains
Glains

Reputation: 2873

Using Java time, you can obtain the total amount of milliseconds between two date-time objects by creating a Duration object.

Duration duration = // TODO
long millis = duration.toMillis();

You did specify 21:48 and 23:23 as String input values. You can use the LocalTime class to represent this concept of hours, minutes and seconds.

LocalTime lt1 = LocalTime.parse("21:48");
LocalTime lt2 = LocalTime.parse("23:23");

Duration ldd = Duration.between(lt1, lt2);
long millis = duration.toMillis(); // 5700000

Please note that this Duration only relates to the LocalTime. If you want to measure the real amount of milliseconds, you have to consider that time-zones may apply daylight saving time.

// in Germany, for example, at 2020-10-25 on 03:00 clocks are turned backward 1 hour 
ZoneId berlin = ZoneId.of("Europe/Berlin");
LocalDateTime ldt1 = LocalDateTime.of(LocalDate.parse("2020-10-24"), lt1);
LocalDateTime ldt2 = LocalDateTime.of(LocalDate.parse("2020-10-25"), lt2);

ZonedDateTime zdt1 = ZonedDateTime.of(ldt1, berlin);
ZonedDateTime zdt2 = ZonedDateTime.of(ldt2, berlin);

// does not consider DST (one hour is missing)
Duration d1 = Duration.between(ldt1, ldt2);
long ms1 = d1.toMillis(); // 92100000

// does consider DST (extra hour applied)
Duration d2 = Duration.between(zdt1, zdt2);
long ms2 = d2.toMillis(); // 95700000

Upvotes: 3

hd1
hd1

Reputation: 34677

Using Joda-Time:

DateTime zero = new DateTime(time); 
long millis = new org.joda.time.Period(DateTime.now()).toDurationFrom(zero).getMillis();

Upvotes: -1

Arvind Kumar Avinash
Arvind Kumar Avinash

Reputation: 79620

You can do it using the modern date-time API as shown below:

import java.time.LocalTime;
import java.time.temporal.ChronoUnit;

public class Main {
    public static void main(String[] args) {
        long millis = LocalTime.parse("21:48").until(LocalTime.parse("23:23"), ChronoUnit.MILLIS);
        System.out.println(millis);
    }
}

Output:

5700000

Learn more about the modern date-time API at Trail: Date Time.

Upvotes: 3

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