Java8中LocalDate的使用---项目中日期处理

// 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));