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LocalDateTime获取当天、本周、本月的开始和结束时间、年总天数和年总周数

		// 获取当天日期
        LocalDate now = LocalDate.now();

        // 当天开始时间
        LocalDateTime todayStart = now.atStartOfDay();
        // 当天结束时间
        LocalDateTime todayEnd = LocalDateTime.of(now, LocalTime.MAX);

        // 周一
        LocalDate monday = now.with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY));
        // 周日
        LocalDate sunday = now.with(TemporalAdjusters.nextOrSame(DayOfWeek.SUNDAY));

        // 本周开始时间
        LocalDateTime weekStart = monday.atStartOfDay();
        // 本周结束时间
        LocalDateTime weekEnd = LocalDateTime.of(sunday, LocalTime.MAX);

        // 本月1号
        LocalDate firstDayOfMonth = now.with(TemporalAdjusters.firstDayOfMonth());
        // 本月最后一天
        LocalDate lastDayOfMonth = now.with(TemporalAdjusters.lastDayOfMonth());
        LocalDateTime firstDayOfMonthStart = firstDayOfMonth.atStartOfDay();
        LocalDateTime firstDayOfMonthEnd = LocalDateTime.of(lastDayOfMonth, LocalTime.MAX);

		// 年总天数
		int lengthOfYear = now.lengthOfYear();
		// 年总周数
		WeekFields weekFields = WeekFields.of(DayOfWeek.MONDAY, 4);
		int num = now().with(TemporalAdjusters.lastDayOfYear()).get(weekFields.weekOfWeekBasedYear());

        DateTimeFormatter pattern = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        System.out.println("当天开始时间 = " + todayStart.format(pattern) + "  时间戳 ：" + todayStart.toInstant(ZoneOffset.of("+8")).toEpochMilli());
        System.out.println("当天结束时间 = " + todayEnd.format(pattern) + "  时间戳 ：" + todayEnd.toInstant(ZoneOffset.of("+8")).toEpochMilli());
        System.out.println("本周开始时间 = " + weekStart.format(pattern) + "  时间戳 ：" + weekStart.toInstant(ZoneOffset.of("+8")).toEpochMilli());
        System.out.println("本周结束时间 = " + weekEnd.format(pattern) + "  时间戳 ：" + weekEnd.toInstant(ZoneOffset.of("+8")).toEpochMilli());
        System.out.println("本月开始时间 = " + firstDayOfMonthStart.format(pattern) + "  时间戳 ：" + firstDayOfMonthStart.toInstant(ZoneOffset.of("+8")).toEpochMilli());
        System.out.println("本月结束时间 = " + firstDayOfMonthEnd.format(pattern) + "  时间戳 ：" + firstDayOfMonthEnd.toInstant(ZoneOffset.of("+8")).toEpochMilli());