Java 8 Date & Time API

Android官方文档里

java.time.temporal: lower level access to the fields.
java.time.format: customization options.

The offset-based date-time types OffsetTime and OffsetDateTime, are intended primarily for use with network protocols and database access. For example, most databases cannot automatically store a time-zone like ‘Europe/Paris’, but they can store an offset like ‘+02:00’.

获取当前月份

Month.from(Instant.now().atZone(ZoneId.of("Asia/Bangkok"));

Instant

An Instant represents a specific moment in time using GMT.

Daylight Saving Time

The United States observes daylight savings time on March 12, 2017, by moving the clocks forward an hour at 2 a.m.

In the United States, daylight savings time ends on November 5th, 2017 at 02:00 a.m. and we repeat the previous hour.

实验如下：

LocalDate localDate = LocalDate.of(2017, Month.NOVEMBER, 5);
LocalTime localTime = LocalTime.of(1, 0);
ZoneId zone = ZoneId.of("America/New_York");
ZonedDateTime z = ZonedDateTime.of(localDate, localTime, zone);
for (int i = 0; i < 6; i++) {
    System.out.println(z.plusHours(i));
}

输出如下：

2017-11-05T01:00-04:00[America/New_York]
2017-11-05T01:00-05:00[America/New_York]
2017-11-05T02:00-05:00[America/New_York]
2017-11-05T03:00-05:00[America/New_York]
2017-11-05T04:00-05:00[America/New_York]
2017-11-05T05:00-05:00[America/New_York]