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  1. import java.time.DayOfWeek;
  2. import java.time.LocalDate;
  3. import java.time.Month;
  4. import java.time.temporal.TemporalAdjusters;
  5. import java.time.temporal.WeekFields;
  6. import java.util.Locale;
  7.  
  8. public class Main {
  9.     public static void main(String[] args) {
  10.         // A sample LocalDate
  11.         LocalDate date = LocalDate.of(2011, Month.JANUARY, 21);
  12.  
  13.         LocalDate dateOnSameOrPreviousMon = date.with(
  14.                 TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY));
  15.  
  16.         LocalDate dateOnSameOrNextSun = date.with(
  17.                 TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY));
  18.  
  19.         System.out.println(dateOnSameOrPreviousMon);
  20.         System.out.println(dateOnSameOrNextSun);
  21.  
  22.         // ###### The first day of the week is Locale-sensitive ######
  23.         LocalDate now = LocalDate.now();
  24.  
  25.         // First day of a week in the US is Sunday
  26.         DayOfWeek firstDayOfWeekUs = now
  27.                 .with(WeekFields.of(Locale.US).dayOfWeek(), 1)
  28.                 .getDayOfWeek();
  29.         System.out.println(firstDayOfWeekUs);
  30.  
  31.         // First day of a week in the UK is Monday
  32.         DayOfWeek firstDayOfWeekUk = now
  33.                 .with(WeekFields.of(Locale.UK).dayOfWeek(), 1)
  34.                 .getDayOfWeek();
  35.         System.out.println(firstDayOfWeekUk);
  36.  
  37.         // ###### Thus, the first and last days of the week of the given date:
  38.  
  39.         // In the US
  40.         LocalDate dateOnFirstDayOfWeekUs = date.with(
  41.                 TemporalAdjusters.previousOrSame(firstDayOfWeekUs));
  42.         LocalDate dateOnLaststDayOfWeekUs = dateOnFirstDayOfWeekUs.plusDays(6);
  43.         System.out.println(dateOnFirstDayOfWeekUs);
  44.         System.out.println(dateOnLaststDayOfWeekUs);
  45.  
  46.         // In the UK
  47.         LocalDate dateOnFirstDayOfWeekUk = date.with(
  48.                 TemporalAdjusters.previousOrSame(firstDayOfWeekUk));
  49.         LocalDate dateOnLaststDayOfWeekUk = dateOnFirstDayOfWeekUk.plusDays(6);
  50.         System.out.println(dateOnFirstDayOfWeekUk);
  51.         System.out.println(dateOnLaststDayOfWeekUk);
  52.     }
  53. }
Success #stdin #stdout 0.14s 59808KB
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Standard input is empty
stdout
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2011-01-17
2011-01-23
SUNDAY
MONDAY
2011-01-16
2011-01-22
2011-01-17
2011-01-23
https://ideone.com/jE5fOJ
language:
Java (HotSpot 12)
created:
1 year ago
visibility:
secret

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