java 1.8 LocalDateTime
LocalDateTime now = LocalDateTime.now();
// 2019-06-27T10:10:42.135
System.out.println(now);
// 2019-06-27 10:10:42
System.out.println(now.format(DateTimeFormatter.ofPattern(DATE_TIME_PATTERN)));
// 2019年6月27日 星期四
System.out.println(now.format(DateTimeFormatter.ofLocalizedDate(FormatStyle.FULL)));
// 2019年6月27日
System.out.println(now.format(DateTimeFormatter.ofLocalizedDate(FormatStyle.LONG)));
// 2019-6-27
System.out.println(now.format(DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM)));
// 19-6-27
System.out.println(now.format(DateTimeFormatter.ofLocalizedDate(FormatStyle.SHORT)));
// 2019-6-27 10:16:32
System.out.println(now.format(DateTimeFormatter.ofLocalizedDateTime(FormatStyle.MEDIUM)));
// 2019年6月27日 上午10时16分32秒
System.out.println(now.format(DateTimeFormatter.ofLocalizedDateTime(FormatStyle.LONG)));
// 19-6-27 上午10:16
System.out.println(now.format(DateTimeFormatter.ofLocalizedDateTime(FormatStyle.SHORT)));
// 2019-06-27T10:00
System.out.println(now.truncatedTo(ChronoUnit.HOURS));
// 2019-06-27T00:00
System.out.println(now.truncatedTo(ChronoUnit.DAYS));
// 减两天
System.out.println(now.minusDays(2));
LocalDate today = LocalDate.now();
//获取当前日期2019-06-27
System.out.println(today);
// 今天的零点2019-06-27T00:00
System.out.println(today.atStartOfDay());
//1 - 7
System.out.println(today.range(ChronoField.DAY_OF_WEEK));
//1 - 365
System.out.println(today.range(ChronoField.DAY_OF_YEAR));
//1 - 30
System.out.println(today.range(ChronoField.DAY_OF_MONTH));
// 加两周
System.out.println(today.plusWeeks(2L));
// 当前时代 IsoEra 值：CE
System.out.println(today.getEra());
// 当前月的天数30
System.out.println(today.lengthOfMonth());
// 28
System.out.println(today.plusMonths(-4L).lengthOfMonth());
// 计算周期
System.out.println(today.until(ChronoLocalDate.from(LocalDate.now().plusMonths(2L))));
// 这个月的第一天
System.out.println(today.with(TemporalAdjusters.firstDayOfMonth()));
// 这个月的第二天
System.out.println(today.withDayOfMonth(2));
// 这个月的最后一天
System.out.println(today.with(TemporalAdjusters.lastDayOfMonth()));
// 这个月的第一个周一
System.out.println(today.with(TemporalAdjusters.firstInMonth(DayOfWeek.MONDAY)));
LocalTime time = LocalTime.now();
// 09:33:33.200
System.out.println(time);
// 09:33:33
System.out.println(time.withNano(0));
// 加一个小时10:33:33.200
System.out.println(time.plusHours(1));
// 减一个小时
System.out.println(time.plusHours(-1));
// 加一个小时
System.out.println(time.plus(1L, ChronoUnit.HOURS));
// 加一个小时
System.out.println(time.plus(Duration.ofHours(1L)));
//9
System.out.println(time.get(ChronoField.HOUR_OF_DAY));
// 0 - 23
System.out.println(time.range(ChronoField.HOUR_OF_DAY));
// 2019-06-27T09:49:22.241
System.out.println(time.atDate(LocalDate.now()));
// 调整时间
System.out.println(time.adjustInto(LocalTime.now()));
