public static void main(String[] args) {LocalDate nowDate = LocalDate.now();System.out.println("本年第一天:" + nowDate.with(TemporalAdjusters.firstDayOfYear()));System.out.println("本年最后一天:" + nowDate.with(TemporalAdjusters.lastDayOfYear()));// 本季度第一天int month = nowDate.getMonthValue();LocalDate firstDayOfQuarter;if (month <= 3) {firstDayOfQuarter = LocalDate.of(nowDate.getYear(), Month.JANUARY, 1);} else if (month <= 6) {firstDayOfQuarter = LocalDate.of(nowDate.getYear(), Month.APRIL, 1);} else if (month <= 9) {firstDayOfQuarter = LocalDate.of(nowDate.getYear(), Month.JULY, 1);} else {firstDayOfQuarter = LocalDate.of(nowDate.getYear(), Month.OCTOBER, 1);}System.out.println("本季度第一天:" + firstDayOfQuarter);System.out.println("本季度最后一天:" + nowDate.plusMonths(3 - nowDate.getMonthValue() % 3).with(TemporalAdjusters.lastDayOfMonth()));System.out.println("本月第一天:" + nowDate.with(TemporalAdjusters.firstDayOfMonth()));System.out.println("本月最后一天:" + nowDate.with(TemporalAdjusters.lastDayOfMonth()));// DayOfWeek可指定一周从星期几开始System.out.println("本周第一天:" + nowDate.with(DayOfWeek.MONDAY));System.out.println("本周最后一天:" + nowDate.with(DayOfWeek.SUNDAY));}
结果示例：
