The string may be interpreted as a local time, a UTC time, or a time in some other time zone, depending on the contents of the string. -The string may be interpreted as a local time, a UTC time, or a time in some other time zone, depending on

A class representing a city, with an associated position, time zone name, and raw offset from UTC.

把北京时间转化为UTC时间，并修改某表的信息-Beijing into the UTC time, and modify information in a table

long String date 的各种格式之间的转换类(a conversion tool for time objects)