How to detect if a date is within this or next week in java?

Question

If I have a date of an event, such as 2011-01-03, how to detect if it is within this or next week in java ? Any sample code ?

Edit :

I thought it was a simple qu

Answer 1

for those that has to stick to JDK 7 and can't use joda.time, I wrote this method and tested.

public static boolean inSameWeek(Date date1, Date date2) {
    if (null == date1 || null == date2) {
        return false;
    }

    Calendar earlier = Calendar.getInstance();
    Calendar later = Calendar.getInstance();

    if (date1.before(date2)) {
        earlier.setTime(date1);
        later.setTime(date2);
    } else {
        earlier.setTime(date2);
        later.setTime(date1);
    }
    if (inSameYear(date1, date2)) {
        int week1 = earlier.get(Calendar.WEEK_OF_YEAR);
        int week2 = later.get(Calendar.WEEK_OF_YEAR);
        if (week1 == week2) {
            return true;
        }
    } else {
        int dayOfWeek = earlier.get(Calendar.DAY_OF_WEEK); 
        earlier.add(Calendar.DATE, 7 - dayOfWeek);
        if (inSameYear(earlier.getTime(), later.getTime())) {
            int week1 = earlier.get(Calendar.WEEK_OF_YEAR);
            int week2 = later.get(Calendar.WEEK_OF_YEAR);
            if (week1 == week2) {
                return true;
            }
        }
    }
    return false;
}

public static boolean inSameYear(Date date1, Date date2) {
    if (null == date1 || null == date2) {
        return false;
    }
    Calendar cal1 = Calendar.getInstance();
    cal1.setTime(date1);
    int year1 = cal1.get(Calendar.YEAR);
    Calendar cal2 = Calendar.getInstance();
    cal2.setTime(date2);
    int year2 = cal2.get(Calendar.YEAR);
    if (year1 == year2)
        return true;

    return false;
}

Answer 2

Most answers here do not satisfy me. They either use the outdated Calendar-API (excusable in old answers given in times before Java 8, and it is hence not fair to criticize such answers), or they are even partially wrong or unnecessarily complex. For example, the most upvoted answer by Jon Skeet suggests to determine the first day of week by the Joda-expression new LocalDate().withDayOfWeek(DateTimeConstants.SUNDAY). But such code uses the ISO-definition of a week starting on Monday with the consequence that if the current date is not on Sunday the code would produce next Sunday and not previous Sunday as desired by the OP. Joda-Time is incapable of handling non-ISO weeks.

Another minor flaw of other answers is not to care about if the current AND NEXT week contains a given date - as requested by the OP. So here my improved suggestion in modern Java:

LocalDate today = LocalDate.now(); // involves the system time zone and clock of system
LocalDate startOfCurrentWeek =
  today.with(TemporalAdjusters.previousOrSame(DayOfWeek.SUNDAY));
LocalDate endOfNextWeek =
  startOfCurrentWeek.plusDays(13);

LocalDate event = LocalDate.of(2011, 1, 3); // input of example given by OP

boolean matchingResult =
  !(event.isBefore(startOfCurrentWeek) || event.isAfter(endOfNextWeek));

Side note: The question has inspired me to add a small enhancement to the class DateInterval in my library Time4J how to determine the current calendar week in a very generic way.

Answer 3

Hint: use Calendar. Create new instance of it for your sample event date. Then, compare WEEK_OF_YEAR for current date, and the date of your event.

Answer 4

It partly depends on what you mean by "this week" and "next week"... but with Joda Time it's certainly easy to find out whether it's in "today or the next 7 days" as it were:

LocalDate event = getDateFromSomewhere();
LocalDate today = new LocalDate();
LocalDate weekToday = today.plusWeeks(1);
LocalDate fortnightToday = weekToday.plusWeeks(1);

if (today.compareTo(event) <= 0 && event.compareTo(weekToday) < 0)
{
    // It's within the next 7 days
}
else if (weekToday.compareTo(event) <= 0 && event.compareTo(fornightToday) < 0)
{
    // It's next week
}

EDIT: To get the Sunday to Saturday week, you'd probably want:

LocalDate startOfWeek = new LocalDate().withDayOfWeek(DateTimeConstants.SUNDAY);

then do the same code as the above, but relative to startOfWeek.

Answer 5

How about this :

Calendar c=Calendar.getInstance();
c.set(Calendar.DAY_OF_WEEK,Calendar.SUNDAY);
c.set(Calendar.HOUR_OF_DAY,0);
c.set(Calendar.MINUTE,0);
c.set(Calendar.SECOND,0);
DateFormat df=new SimpleDateFormat("EEE yyyy/MM/dd HH:mm:ss");
System.out.println(df.format(c.getTime()));      // This past Sunday [ May include today ]
c.add(Calendar.DATE,7);
System.out.println(df.format(c.getTime()));      // Next Sunday
c.add(Calendar.DATE,7);
System.out.println(df.format(c.getTime()));      // Sunday after next

The result :

Sun 2010/12/26 00:00:00
Sun 2011/01/02 00:00:00
Sun 2011/01/09 00:00:00

Any day between the first two is this week, anything between the last two is next week.

Answer 6

Although old question - is still relevant. The most upvoted answer here is correct wrt to Joda-time and wrt to JDK8 as well with some syntax changes. Here's one that might help those who are looking around in JDK8 world.

 public static boolean isLocalDateInTheSameWeek(LocalDate date1, LocalDate date2) {
    LocalDate sundayBeforeDate1 = date1.with(TemporalAdjusters.previousOrSame(DayOfWeek.SUNDAY));
    LocalDate saturdayAfterDate1 = date1.with(TemporalAdjusters.nextOrSame(DayOfWeek.SATURDAY));
    return  ((date2.isEqual(sundayBeforeDate1) || date2.isAfter(sundayBeforeDate1)) 
            && (date2.isEqual(saturdayAfterDate1) || date2.isBefore(saturdayAfterDate1)));
}