How to find next dates of some specific day occured after specific date using java?

Question

String specificDate=2013+"-"+06+"-"+20;
String day="Monday";

How to find the next date where Monday comes that is after that specificDate?

Sounds like a homework problem. You can use java.util.Calendar and then increment it until you get to the next Monday. — dplass, Jun 20 '13 at 11:11

score 3 · Answer 1 · answered Jun 20 '13 at 11:12

3

You either want to look at Java's Calendar or JodaTime, given you're looking at rules over dates, I'd recommend Joda.

answered Jun 20 '13 at 11:12

Jim

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AllTooSir · Answer 2 · 2013-06-20T11:21:19.667

1

 Calendar now = Calendar.getInstance();  
 SimpleDateFormat sdf = new SimpleDateFormat(formatString);
 now.setTime(sdf.parse(dateString));
 int weekday = now.get(Calendar.DAY_OF_WEEK);  
 if (weekday != Calendar.MONDAY)  
 {  

     int days = (Calendar.SATURDAY - weekday + 2) % 7;  
     now.add(Calendar.DAY_OF_YEAR, days);  
 }  
 Date monday = now.getTime();

edited Jun 20 '13 at 11:21

answered Jun 20 '13 at 11:12

AllTooSir

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score 1 · Answer 3 · answered Jun 20 '13 at 11:12

You should really use a higher level Date library to do that for you. Unfortunately, java's built in Date and Calendar class are far less than ideal. You can take a look at this library, which has come the de facto standard for date manipulation among Java developers, until the new JDK design is finalized.

http://joda-time.sourceforge.net/

score 1 · Answer 4 · answered Jun 20 '13 at 11:15

You should use the Calendar class for that.

Calendar c1 = Calendar.getInstance();  
c1.set(2013, Calendar.JUNE, 20);

int weekday = now.get(Calendar.DAY_OF_WEEK);  
if (weekday != Calendar.MONDAY) {
    // calculate how much to add
    // the 2 is the difference between Saturday and Monday
    int days = (Calendar.SATURDAY - weekday + 2) % 7;
    now.add(Calendar.DAY_OF_YEAR, days);
}

score 1 · Answer 5 · answered Jun 20 '13 at 11:17

1

try this

    Calendar c = new GregorianCalendar(2013, 5, 20);
    int diff = Calendar.MONDAY - c.get(Calendar.DAY_OF_WEEK);
    if (diff < 0) {
        diff = 7 + diff;
    }
    c.add(Calendar.DATE, diff);
    Date monday = c.getTime();

answered Jun 20 '13 at 11:17

Evgeniy Dorofeev

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Joni · Answer 6 · 2013-06-21T07:26:00.233

The easiest way to do this with the standard API is setting the day of week to Monday and then advancing one week:

Calendar c = Calendar.getInstance();
c.set(Calendar.DAY_OF_WEEK, Calendar.MONDAY); // Sets c to this week's Monday
c.add(Calendar.DATE, 7);                      // Advances c to next week's Monday

Note that if the first day of the week in your culture is Sunday and the date your start with is a Sunday, the set method moves the date to the following Monday-not the preceding one-and you end up calculating second Monday after the given date. If the first day of the week is Monday everything works as expected.

score 1 · Answer 7 · edited May 23 '17 at 12:08

For Java 8, you could use something like...

LocalDate date = LocalDate.of(2013, Month.JUNE, 20);
LocalDate nextWed2 = date.with(TemporalAdjusters.nextOrSame(DayOfWeek.MONDAY));

or...

LocalDate date = LocalDate.of(2013, Month.JUNE, 20);
LocalDate nextWed2 = date.with(TemporalAdjusters.next(DayOfWeek.MONDAY));

if the select date was MONDAY, but you wanted the next MONDAY

As demonstrated here in much more detail

Or if you prefer to use JodaTime...

    LocalDate date = new LocalDate(2013, DateTimeConstants.JUNE, 20);
    LocalDate nextMonday = new LocalDate(date);
    if (date.getDayOfWeek() >= DateTimeConstants.FRIDAY) {
        nextMonday = date.plusWeeks(1);
    }
    nextMonday = nextMonday.withDayOfWeek(DateTimeConstants.FRIDAY);

Which is based on this answer

How to find next dates of some specific day occured after specific date using java?

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