Java Time: Get max number of weeks for particular year

user_2750966 0
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I only found a solution for Joda Time.

My solution works only if the last day is not in the first week:

LocalDate.now() // or any other LocalDate
  .withDayOfMonth(31)
  .withMonth(12)
  .get(weekFields.weekOfWeekBasedYear())

So what is the correct way in Java Time (like in Joda Time)?

week-number java-time date datetime java
4 Answers

If one wants to get the week number based on 7 days no matter when the week starts and how many days the first partial week of the year has, ChronoField.ALIGNED_WEEK_OF_YEAR might be helpful.

For example, the 1st of January 2016 based on the ISO-8601 definition (where a week starts on Monday and the first week has a minimum of 4 days) falls into week number 0, but in the aligned it is week number 1.

    LocalDate date = LocalDate.of(2016, 1, 1);

    int iso8601 = date.get(WeekFields.ISO.weekOfYear()); // result is 0

    int aligned = date.get(ChronoField.ALIGNED_WEEK_OF_YEAR); // result is 1
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