Question 126359 in Android Studio Question posted in
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Android Studio – How can I calculate, How much time is left before tomorrow?

How can I calculate and format time like HH:mm, Of much time is left before tomorrow? with SimpleDateFormat.

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  1. 0 
    import java.time.LocalDateTime;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.Duration;


LocalDateTime tomorrowMidnight = LocalDateTime.of(LocalDate.now(), LocalTime.MIDNIGHT).plusDays(1);        
        
Duration duration = Duration.between(LocalDateTime.now(), tomorrowMidnight);
System.out.printf("%d:%d", duration.toHours(), duration.toMinutes()%60);
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  2. 0

    SimpleDateFormat and related legacy classes were years ago supplanted by the modern java.time classes defined in JSR 310.

    Determining “tomorrow” requires a time zone. Days start earlier as you move eastward through time zones.

    ZoneId z = ZoneId.of( "Asia/Tokyo" ) ;

    Capture the current moment as seen through that time zone.

    ZonedDateTime now = ZonedDateTime.now( z ) ;

    Now we are in a position to determine “tomorrow”, specifically the first moment of the following day.

    Extract the date portion.

    LocalDate today = now.toLocalDate() ;
LocalDate tomorrow = today.plus( 1 ) ;

    Get first moment. Note that we do not assume the day starts at 00:00 🕛. Some dates in some zones start at a different time of day, such as 01:00 🕐. Let java.time determine the first moment.

    ZonedDateTime startTomorrowTokyo = tomorrow.atStartOfDay( z ) ;

    Calculate time to elapse.

    Duration untilTomorrow = Duration.between ( now , startTomorrowTokyo ) ;

    Generate text in standard ISO 8601 format.

    String output = untilTomorrow.toString() ;

    If you insist on the risky ambiguous use of clock-time to represent the duration, you can build your own string by interrogating the Duration object. Call its to…Part methods.

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