I want to get all the weeks in a year with the start and end working day date for each week in java starting at current date?

Question

Example

As per today's date 24 june 2019 (which is week 24 in a year) then it should show the below details.

data:[
 week:24
 {
 startDate:24-06-2019,
 endDate: 28-06-2019
},
week: 25 
{
  startDate: 01-07-2019,
  endDate: 05-07-2019
}

Similar data for one year. How can I achieve this data in java. As I am new to java I am struggling to solve this issue. Please help with your explanation or code if possible.

PS: There are 53 weeks in a year.

Answer 1

I would perform this with a good old loop :

public void workingDayOfYear() {
    LocalDate date = LocalDate.of(2019, 6, 24); // Java 8 date
    int initialWeekOfyear = date.get(WeekFields.of(Locale.UK).weekOfWeekBasedYear());
    int weekOfYear = initialWeekOfyear;
    do {
        LocalDate firstDayOfWeek = date.with(WeekFields.of(Locale.UK).dayOfWeek(), 1L);
        LocalDate lastWorkingDayOfWeek = date.with(WeekFields.of(Locale.UK).dayOfWeek(), 5L);

        StringBuilder result = new StringBuilder("Week : ");
        result.append(weekOfYear);
        result.append(", start=");
        result.append(firstDayOfWeek);
        result.append(", end=");
        result.append(lastWorkingDayOfWeek);

        System.out.println(result.toString());
        date = date.plusWeeks(1);
    } while ((weekOfYear = date.get(WeekFields.of(Locale.UK).weekOfWeekBasedYear())) != initialWeekOfyear);
}

Output:

Week : 26, start=2019-06-24, end=2019-06-28

Week : 27, start=2019-07-01, end=2019-07-05

...

Week : 24, start=2020-06-08, end=2020-06-12

Week : 25, start=2020-06-15, end=2020-06-19

Notice that the 53rd week you need is in fact the first week of 2020.