如何檢索過去90天的星期五日期？

Question

我想在下拉列表中顯示過去90天的所有星期結束日期。如何檢索過去90天的星期五日期？

Answer 1

爲了給你一個想法（因爲你標記了JAVA），在JAVA中，這可以使用Date API來完成。對於測試，我只是檢查5周，你可以一直到90周。請注意，這提供了一個想法，可以優化，可能是的

public static void main(String[] args) { 
    try { 
     LocalDateTime localDateTime = LocalDate.now().atStartOfDay(); 
     DayOfWeek dotw = localDateTime.getDayOfWeek(); 
     String dayOfTheWeek = dotw.name(); 

     for (int daysOfTheWeek = 1; daysOfTheWeek < 7; daysOfTheWeek++) { 
      if (dayOfTheWeek.equals(DayOfWeek.FRIDAY.name())) { 
       break; 
      } else { 
       localDateTime = LocalDate.now().atStartOfDay().minusDays(daysOfTheWeek); 
       dotw = localDateTime.getDayOfWeek(); 
       dayOfTheWeek = dotw.name(); 
      } 
     } 
     ArrayList<LocalDate> localDates = new ArrayList<LocalDate>(); 

     for (int weekCount = 0; weekCount < 5; weekCount++) { 
      localDates.add(localDateTime.minusWeeks(weekCount).toLocalDate()); 
     } 
     System.out.println(localDates); 

    } catch (final Throwable t) { 
     t.printStackTrace(); 
    } 
}