函数NEW_TIME用于将一个日期和时间值从一个时区转换到另外一个时区。这个函数返回值类型为DATE。语法如下:

NEW_TIME(DATE, time_zone1, time_zone2)

其中参数time_zone1和time_zone2必须是从下面列表中列Time Zone中取出的字符串类型 值。

Time Zone Offset from UTC Description
AST UTC+4 Atlantic Standard Time
ADT UTC+3 Atlantic Daylight Time
BST UTC+11 Bering Standard Time
BDT UTC+10 Bering Daylight Time
CST UTC+6 Central Standard Time
CDT UTC+5 Central Daylight Time
EST UTC+5 Eastern Standard Time
EDT UTC+4 Eastern Daylight Time
GMT UTC Greenwich Mean Time
HST UTC+10 Alaska-Hawaii Standard Time
HDT UTC+9 Alaska-Hawaii Daylight Time
MST UTC+7 Mountain Standard Time
MDT UTC+6 Mountain Daylight Time
NST UTC+3:30 Newfoundland Standard Time
PST UTC+8 Pacific Standard Time
PDT UTC+7 Pacific Daylight Time
YST UTC+9 Yukon Standard Time
YDT UTC+8 Yukon Daylight Time

下面是一个关于函数NEW_TIME的示例:

SELECT NEW_TIME(TO_DATE('08-13-07 10:35:15','MM-DD-YY HH24:MI:SS'),'AST', 'PST') "Pacific Standard Time" FROM DUAL;

Pacific Standard Time
---------------------  
 13-AUG-07 06:35:15
(1 row)