![]() That could be good for timestamp WITH time zone if, and only if, the rules defined by region's laws about time zone didn't ever change. ![]() That is when you want to store events in the future and that some kind of alert must be triggered when we got to that time. Now, with those two down, I can came with only one good reason to use timestamp WITHOUT time zone. But it is also considered an anti-pattern, simple because the correct solution for (1) is to configure the TimeZone setting to the given one timezone for the system and (2) is already solved, as PostgreSQL already stores everything on the same timezone (UTC). It is considered valid for some to use timestamp WITHOUT time zone in situations where (1) everything is in the same timezone or (2) the application layer handles the time zone and just store everything in a certain time zone (usually UTC). If no time zone is stated in the input string, then it is assumed to be in the time zone indicated by the system's TimeZone parameter, and is converted to UTC using the offset for the timezone zone. An input value that has an explicit time zone specified is converted to UTC using the appropriate offset for that time zone. What it does is to store every data in UTC time zone, as stated in the docs:įor timestamp with time zone, the internally stored value is always in UTC (Universal Coordinated Time, traditionally known as Greenwich Mean Time, GMT). Returns the year of the ISO week from x.This is stated in a lot of places, but I think it worth mentioning always when we compare the timestamp with time zone with timestamp without time zone types: the timestamp WITH time zone does not store the time zone information along with the timestamp. Returns the minute of the time zone offset from timestamp. Returns the hour of the time zone offset from timestamp. Returns the millisecond of the second from x. The value ranges from 1 (Monday) to 7 (Sunday). Convenience extraction functions # day ( x ) → bigint # This SQL-standard function uses special syntax for specifying the arguments. Most fields support all date and time types. The types supported by the extract function vary depending on theįield to be extracted. The extract function supports the following fields: Parses string into a timestamp with time zone using format. parse_datetime ( string, format ) → timestamp with time zone # format_datetime ( timestamp, format ) → varchar #įormats timestamp as a string using format. JodaTime’s DateTimeFormat pattern format. This specifier does not support 0 as a month or day. Consider using day_of_week() (it uses 1-7 instead of 0-6). When parsing, two-digit year format assumes range 1970. Year for the week, where Monday is the first day of the week, numeric, four digits used with %v Year for the week where Sunday is the first day of the week, numeric, four digits used with %V 6), where Sunday is the first day of the week 53), where Monday is the first day of the week used with %xĭay of the week ( 0. 53), where Sunday is the first day of the week used with %X 53), where Monday is the first day of the week 53), where Sunday is the first day of the week Time of day, 24-hour (equivalent to %H:%i:%s) Time of day, 12-hour (equivalent to %h:%i:%s %p) 31) įraction of second (6 digits for printing: 000000. The following table,īased on the MySQL manual, describes the format specifiers:ĭay of the month with English suffix ( 0th, 1st, 2nd, 3rd, …)ĭay of the month, numeric ( 01. The MySQL date_parse and str_to_date functions. The functions in this section use a format string that is compatible with SELECT human_readable_seconds ( 96 ) - 1 minute, 36 seconds SELECT human_readable_seconds ( 3762 ) - 1 hour, 2 minutes, 42 seconds SELECT human_readable_seconds ( 56363463 ) - 93 weeks, 1 day, 8 hours, 31 minutes, 3 seconds MySQL date functions # from_unixtime_nanos ( unixtime ) → timestamp(9) with time zone # The number of seconds since 00:00:00 in double data type. Using hours and minutes for the time zone offset. from_unixtime ( unixtime, hours, minutes ) → timestamp(3) with time zone Returns the UNIX timestamp unixtime as a timestamp with time zone from_unixtime ( unixtime, zone ) → timestamp(3) with time zone Returns the UNIX timestamp unixtime as a timestamp with time zone. ![]() SELECT current_timezone () - America/New_York SELECT with_timezone ( TIMESTAMP ' 09:08:07.321', 'America/Los_Angeles' ) - 09:08:07.321 America/Los_Angeles from_unixtime ( unixtime ) → timestamp(3) with time zone # ![]()
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