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The PostgreSQL 9.0 Reference Manual - Volume 1A - SQL Language Reference
by The PostgreSQL Global Development Group
Paperback (6"x9"), 454 pages
ISBN 9781906966041
RRP £14.95 ($19.95)

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The time-of-day types are time [ (p) ] without time zone and time [ (p) ] with time zone. time alone is equivalent to time without time zone.

Valid input for these types consists of a time of day followed by an optional time zone. (See Table 6-11 and Table 6-12.) If a time zone is specified in the input for time without time zone, it is silently ignored. You can also specify a date but it will be ignored, except when you use a time zone name that involves a daylight-savings rule, such as America/New_York. In this case specifying the date is required in order to determine whether standard or daylight-savings time applies. The appropriate time zone offset is recorded in the time with time zone value.

Table 6-11: Time Input
Example Description
04:05:06.789 ISO 8601
04:05:06 ISO 8601
04:05 ISO 8601
040506 ISO 8601
04:05 AM same as 04:05; AM does not affect value
04:05 PM same as 16:05; input hour must be \leq12
04:05:06.789-8 ISO 8601
04:05:06-08:00 ISO 8601
04:05-08:00 ISO 8601
040506-08 ISO 8601
04:05:06 PST time zone specified by abbreviation
2003-04-12 04:05:06 America/New_York time zone specified by full name
Table 6-12: Time Zone Input
Example Description
PST Abbreviation (for Pacific Standard Time)
America/New_York Full time zone name
PST8PDT POSIX-style time zone specification
-8:00 ISO-8601 offset for PST
-800 ISO-8601 offset for PST
-8 ISO-8601 offset for PST
zulu Military abbreviation for UTC
z Short form of zulu

Refer to section 6.5.3 Time Zones for more information on how to specify time zones.

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