// 获取当前日期
LocalDate now = LocalDate.now(); // 设置日期
LocalDate now2 = LocalDate.of(2099, 2, 28); // 解析日期，格式必须是yyyy-MM-dd
LocalDate now3 = LocalDate.parse("2018-01-12"); DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/MM/dd"); String formatRs = now.format(dtf); // 取本月第一天
LocalDate firstDay = now.with(TemporalAdjusters.firstDayOfMonth()); LocalDate firstDay2 = now.withDayOfMonth(1); // 取本月第2天
LocalDate secondDay = now.withDayOfMonth(2); LocalDate nextMonthDay = now.with(TemporalAdjusters.firstDayOfNextMonth()); LocalDate nextYearDay = now.with(TemporalAdjusters.firstDayOfNextYear()); // 明年的这一天
LocalDate localDate = now.plusYears(1); // 当前日期加上往后推20天
LocalDate plusDate = now.plus(20, ChronoUnit.DAYS); LocalDate plusYear = now.plus(10, ChronoUnit.YEARS); // 当前日期往前推10天
LocalDate minusDay = now.minusDays(10); LocalDate minusYear = now.minus(10, ChronoUnit.YEARS); //localDate转Date
ZoneId zoneId = ZoneId.systemDefault(); ZonedDateTime zdt = now.atStartOfDay(zoneId); Instant instant = zdt.toInstant(); Date fromDate = Date.from(instant); // Date转LocalDate
Date date = new Date(); Instant instantToUse = date.toInstant(); ZoneId zoneIdToUse = ZoneId.systemDefault(); LocalDate localDateToShow = instantToUse.atZone(zoneIdToUse).toLocalDate(); // 比较日期大小
boolean b1 = localDateToShow.equals(LocalDate.of(2018, 04, 27)); boolean b2= localDateToShow.equals(LocalDate.of(2018, 04, 26)); // 判断日期前后 -> false
boolean b3 = localDateToShow.isAfter(LocalDate.of(2018, 04, 26));//false
boolean b4 = localDateToShow.isAfter(LocalDate.of(2018, 04, 25));//true
boolean b5 = localDateToShow.isBefore(LocalDate.of(2018, 04, 26));//false
boolean b6 = localDateToShow.isBefore(LocalDate.of(2018, 04, 25));//false
boolean b7 = localDateToShow.isBefore(LocalDate.of(2018, 04, 27));//true // 计算两个日期之间的时间间隔 格式为：x年x月x天
Period between = Period.between(localDateToShow, LocalDate.of(2018, 05, 28)); long bwDays = ChronoUnit.DAYS.between(localDateToShow, LocalDate.of(2018, 05, 28));