JAVA

compare two times in java

String startTime = "10:00";
    String endTime = "12:00";
    SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");
    Date d1 = sdf.parse(startTime);
    Date d2 = sdf.parse(endTime);
    long elapsed = d2.getTime() - d1.getTime(); 
    System.out.println(elapsed);

compare time in java

for ( Map.Entry<DayOfWeek , LocalTime> entry : dayToTimeMap.entrySet () ) {
    DayOfWeek key = entry.getKey ();
    LocalTime value = entry.getValue ();
    int comparison = key.compareTo ( today );
    if ( comparison < 0 ) { // if earlier day…
        earlier.add ( key );
    } else if ( comparison == 0 ) { //If same day…
        if ( value.isBefore ( now ) ) {
            earlier.add ( key );
        } else {  // Else same time as now or later than now…
            later.add ( key );
        }
    } else if ( comparison > 0 ) {
        later.add ( key );
    } else {
        throw new RuntimeException ( "Unexpectedly reached IF-ELSE for comparison: " + comparison );
    }
}