如何检索最后90天的星期五日期？

Question

我想在下拉列表中显示过去90天的所有周结束日期。如何检索最后90天的星期五？

Answer 1

只是为了给你一个想法（因为你标记了JAVA），在JAVA中这可以使用Date API来完成。对于测试我只需要检查5周，你可以一直到90周。请注意，这提供了一个想法，可以优化，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();
    }
}