JodaTime: how to find a future time in a different timezone

Question

I need to find the point in time, when it will next be 7:00 in the morning in Auckland (in New Zealand)

I am using joda-time 2.6

    <dependency>
        <groupId>joda-time</groupId>
        <artifactId>joda-time</artifactId>
        <version>2.6</version>
    </dependency>

When testing with the following

import org.joda.time.DateTime;
import org.joda.time.DateTimeZone;
import org.joda.time.format.DateTimeFormat;
import org.joda.time.format.DateTimeFormatter;

public class FindDateTimeInFuture {
    static DateTimeFormatter formatter = DateTimeFormat.forPattern("yyyy-MM-dd HH:mm:ss.SSS z Z");

    public static void main(String[] args) {
        // Use UTC as application wide default
        DateTimeZone.setDefault(DateTimeZone.UTC);

        System.out.println("now UTC         = " + formatter.print(DateTime.now()));

        System.out.println("now in Auckland = " + formatter.print(DateTime.now(DateTimeZone.forID("Pacific/Auckland"))));

        System.out.println("7 AM Auckland   = " + formatter.print(DateTime.now(DateTimeZone.forID("Pacific/Auckland")).withTime(7, 0, 0, 0)));
    }
}

If I run the above after Midnight in Auckland, it is fine, it is

now UTC         = 2016-09-01 13:37:26.844 UTC +0000
now in Auckland = 2016-09-02 01:37:26.910 NZST +1200
7 AM Auckland   = 2016-09-02 07:00:00.000 NZST +1200
                           ^ ok, in the future

But, if I run the above before Midnight in Auckland, I get the 7 AM in the past ...

now UTC         = 2016-09-01 09:37:48.737 UTC +0000
now in Auckland = 2016-09-01 21:37:48.831 NZST +1200
7 AM Auckland   = 2016-09-01 07:00:00.000 NZST +1200
                           ^ ko, in the past

Is there a way to tell joda-time to go forward when changing the time ?

Answer 1

I think the most obvious solution may be correct one

DateTime nowAuckland = 
    DateTime.now(DateTimeZone.forID("Pacific/Auckland"));
boolean addDay = nowAuckland.getHourOfDay() >= 7;
DateTime aucklandAt700 = nowAuckland.withTime(7, 0, 0, 0);
if (addDay) {
    aucklandAt700 = aucklandAt700.plusDays(1);
}

You can just check if there is already more than 7:00 at Auckland and if so just increment number of days.