Java 使用LocalDate获取上周时间、本月时间等

		// 获取当前时间
        LocalDate currentDate = LocalDate.now();

        // 获取当前日期所在的星期几
        DayOfWeek currentDayOfWeek = currentDate.getDayOfWeek();
        // 计算需要减去的天数
        int daysToSubtract = currentDayOfWeek.getValue() - DayOfWeek.MONDAY.getValue();
        // 获取本周一的日期
        LocalDate thisMonday = currentDate.minusDays(daysToSubtract);
        // 获取上周一的日期
        LocalDate lastMonday = thisMonday.minusDays(7);

        // 计算需要增加的天数
        int daysToAdd = DayOfWeek.SUNDAY.getValue() - currentDayOfWeek.getValue();
        // 获取本周日的日期
        LocalDate thisSunday = currentDate.plusDays(daysToAdd);
        // 获取上周日的日期
        LocalDate lastSunday = thisSunday.minusDays(7);

        System.out.println("上周一的时间: " + lastMonday.toString());
        System.out.println("上周日的时间: " + lastSunday);


        // 获取上月一号的时间
        LocalDate firstDayOfLastMonth = currentDate.with(TemporalAdjusters.firstDayOfMonth()).minusMonths(1);
        System.out.println("上月一号的时间: " + firstDayOfLastMonth);

        // 获取为本月一号的时间
        LocalDate firstDayOfCurrentMonth = currentDate.with(TemporalAdjusters.firstDayOfMonth());
        // 上个月的最后一天的时间
        LocalDate last = firstDayOfCurrentMonth.minusDays(1);
        // 获取上个月的总天数
        int dayOfMonth = last.getDayOfMonth();
        System.out.println(dayOfMonth);

        System.out.println("上个月月末的时间: " + last);

        // 获取上个月的YearMonth对象
        YearMonth lastMonth = YearMonth.now().minusMonths(1);
        // 获取上个月的总天数
        int daysInLastMonth = lastMonth.lengthOfMonth();
        System.out.println("上个月的总天数: " + daysInLastMonth);