Time in Fortress

import java.time.*;
import java.time.temporal.ChronoUnit;

public class TimeExample {
    public static void main(String[] args) {
        // We'll start by getting the current time.
        Instant now = Instant.now();
        System.out.println(now);

        // You can build a time struct by providing the
        // year, month, day, etc. Times are always associated
        // with a ZoneId, i.e. time zone.
        ZonedDateTime then = ZonedDateTime.of(2009, 11, 17, 20, 34, 58, 651387237, ZoneId.of("UTC"));
        System.out.println(then);

        // You can extract the various components of the time
        // value as expected.
        System.out.println(then.getYear());
        System.out.println(then.getMonth());
        System.out.println(then.getDayOfMonth());
        System.out.println(then.getHour());
        System.out.println(then.getMinute());
        System.out.println(then.getSecond());
        System.out.println(then.getNano());
        System.out.println(then.getZone());

        // The Monday-Sunday Weekday is also available.
        System.out.println(then.getDayOfWeek());

        // These methods compare two times, testing if the
        // first occurs before, after, or at the same time
        // as the second, respectively.
        System.out.println(then.isBefore(ZonedDateTime.now()));
        System.out.println(then.isAfter(ZonedDateTime.now()));
        System.out.println(then.isEqual(ZonedDateTime.now()));

        // The Duration class represents the interval between two times.
        Duration diff = Duration.between(then.toInstant(), now);
        System.out.println(diff);

        // We can compute the length of the duration in
        // various units.
        System.out.println(diff.toHours());
        System.out.println(diff.toMinutes());
        System.out.println(diff.getSeconds());
        System.out.println(diff.toNanos());

        // You can use plus to advance a time by a given
        // duration, or with a minus to move backwards by a
        // duration.
        System.out.println(then.plus(diff));
        System.out.println(then.minus(diff));
    }
}

This Java code demonstrates various operations with dates, times, and durations using the java.time package, which was introduced in Java 8.

Here’s a breakdown of the main differences and similarities:

In Java, we use Instant for a point in time and ZonedDateTime for a date and time with a time zone.
The time.Date() function in Go is replaced by ZonedDateTime.of() in Java.
Java’s Duration class is similar to Go’s, representing a time span between two instants.
Methods like Before(), After(), and Equal() in Go are replaced by isBefore(), isAfter(), and isEqual() in Java.
The Sub() method in Go is replaced by Duration.between() in Java.
Java’s plus() and minus() methods are equivalent to Go’s Add() method with positive and negative durations.

To run this program, save it as TimeExample.java, compile it with javac TimeExample.java, and then run it with java TimeExample. The output will be similar to the Go example, showing various time and duration operations.

Remember that Java’s date and time API provides even more functionality than what’s shown here. For more complex date and time manipulations, you might want to explore classes like LocalDate, LocalTime, Period, and others in the java.time package.

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