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MDEV-31684 Add timezone information to DATE_FORMAT

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Before starting to go over the format string, prepare the current time
zone information incase '%z' or '%Z' is encountered.
This information can be obtained as given below:

A) If timezone is not set ( meaning we are working with system timezone):
Get the MYSQL_TIME representation for current time and GMT time using
current thread variable for timezone and timezone variable for UTC
respectively. This MYSQL_TIME variable will be used to calculate time
difference. Also convert current time in second to tm structure to
get system timezone information.

B) If timezone is set as offset:
Get timezone information using current timezone information and store
in appropriate variable.

C) If timezone is set as some place (example: Europe/Berlin)
Get timezone information by searching the timezone. During internal
timezone search, information like timeoffset from UTC and abbrevation
is stored in another relevant structure. Hence use the same information.
This commit is contained in:
Rucha Deodhar
2023-08-04 00:28:13 +05:30
parent 5fc19e7137
commit 94eb819296
10 changed files with 292 additions and 59 deletions
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48
mysql-test/main/date_formats.test
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@ -256,3 +256,51 @@ select time_format('2001-01-01 02:02:02', '%d %T');
select time_format('01 02:02:02', '%d %T');
select time_format('01 02:02:02', '%T');
select time_format('2001-01-01 02:02:02', '%T');
--echo #
--echo # Beginning of 11.3 test
--echo #
--echo # MDEV-31684: Add timezone information to DATE_FORMAT
--echo #
SET @old_timezone= @@time_zone;
--echo # Using named timezones
SET TIME_ZONE='Japan';
SELECT DATE_FORMAT('2009-10-04 22:23:00', '%z %Z') AS current_timezone;
SET @@time_zone='Europe/Moscow';
SELECT DATE_FORMAT('1965-02-17 22:23:00', '%z %Z') AS current_timezone;
SELECT DATE_FORMAT('1965-12-31 22:23:00', '%z %Z') AS current_timezone;
SELECT DATE_FORMAT('1985-06-01', '%z %Z');
--echo # Using positive and negative offset
SET TIME_ZONE= '-05:30';
SELECT DATE_FORMAT('2009-10-04 22:23:00', '%z %Z') AS current_timezone;
SET TIME_ZONE= '+04:30';
SELECT DATE_FORMAT('2009-10-04 22:23:00', '%z %Z') AS current_timezone;
--echo # Using UTC
SET TIME_ZONE='UTC';
SELECT DATE_FORMAT('2009-10-04 22:23:00', '%z %Z') AS current_timezone;
--echo # using system time
--echo #
--echo # output depends on system time information. Hence replacing
--echo # to avoid result diff test failures.
--echo #
SET @@time_zone= default;
--replace_regex /[+-][0-9]* [A-Z]*/+|-HH:MM ABC/
SELECT DATE_FORMAT('2009-10-04 22:23:00', '%z %Z') AS current_timezone;
SET @@time_zone= @old_timezone;
--echo # End of 11.3 test