clock change

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Old 10-31-2007
clock change


We had a AIX box built last year but was set to the correct GMT time, but using DST time zone. In march this year the clocks went forward without issues. (if I remember a couple of weeks early due to the DST zone)

This year we decided to change the clock to the correct time zone before the clock change at the weekend.

Therefore the timezone was set to BST, however this weekend (28th October) the clock didnt change.

Now we dont really know AIX and have a third party do all the work. What we have been told is there is some file that needs changing and was missed when they set the clock to BST. But one of the questions is why didnt the clocks adjust automatically when set to DST on Sunday.

My next question is

We have now been told that to change the clock to BST correct time, we have to stop our applications/stop oracle and reboot the server so it will automatically change when the clocks jump forward/backwards.

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CTIME(3)						     Library Functions Manual							  CTIME(3)

ctime, localtime, gmtime, asctime, timezone, tzset - convert date and time to ASCII SYNOPSIS
void tzset() char *ctime(clock) time_t *clock; #include <time.h> char *asctime(tm) struct tm *tm; struct tm *localtime(clock) time_t *clock; struct tm *gmtime(clock) time_t *clock; char *timezone(zone, dst) DESCRIPTION
Tzset uses the value of the environment variable TZ to set up the time conversion information used by localtime. If TZ does not appear in the environment, the TZDEFAULT file (as defined in tzfile.h) is used by localtime. If this file fails for any reason, the GMT offset as provided by the kernel is used. In this case, DST is ignored, resulting in the time being incorrect by some amount if DST is currently in effect. If this fails for any reason, GMT is used. If TZ appears in the environment but its value is a null string, Greenwich Mean Time is used; if TZ appears and begins with a slash, it is used as the absolute pathname of the tzfile(5)-format file from which to read the time conversion information; if TZ appears and begins with a character other than a slash, it's used as a pathname relative to the system time conversion information directory, defined as TZDIR in the include file tzfile.h. If this file fails for any reason, GMT is used. Programs that always wish to use local wall clock time should explicitly remove the environmental variable TZ with unsetenv(3). Ctime converts a long integer, pointed to by clock, such as returned by time(2) into ASCII and returns a pointer to a 26-character string in the following form. All the fields have constant width. Sun Sep 16 01:03:52 1973 Localtime and gmtime return pointers to structures containing the broken-down time. Localtime corrects for the time zone and possible day- light savings time; gmtime converts directly to GMT, which is the time UNIX uses. Asctime converts a broken-down time to ASCII and returns a pointer to a 26-character string. The structure declaration from the include file is: struct tm { int tm_sec; /* 0-59 seconds */ int tm_min; /* 0-59 minutes */ int tm_hour; /* 0-23 hour */ int tm_mday; /* 1-31 day of month */ int tm_mon; /* 0-11 month */ int tm_year; /* 0- year - 1900 */ int tm_wday; /* 0-6 day of week (Sunday = 0) */ int tm_yday; /* 0-365 day of year */ int tm_isdst; /* flag: daylight savings time in effect */ char **tm_zone; /* abbreviation of timezone name */ long tm_gmtoff; /* offset from GMT in seconds */ }; Tm_isdst is non-zero if a time zone adjustment such as Daylight Savings time is in effect. Tm_gmtoff is the offset (in seconds) of the time represented from GMT, with positive values indicating East of Greenwich. Timezone remains for compatibility reasons only; it's impossible to reliably map timezone's arguments (zone, a "minutes west of GMT" value and dst, a "daylight saving time in effect" flag) to a time zone abbreviation. If the environmental string TZNAME exists, timezone returns its value, unless it consists of two comma separated strings, in which case the second string is returned if dst is non-zero, else the first string. If TZNAME doesn't exist, zone is checked for equality with a built-in table of values, in which case timezone returns the time zone or daylight time zone abbreviation associated with that value. If the requested zone does not appear in the table, the difference from GMT is returned; e.g. in Afghanistan, timezone(-(60*4+30), 0) is appropri- ate because it is 4:30 ahead of GMT, and the string GMT+4:30 is returned. Programs that in the past used the timezone function should return the zone name as set by localtime to assure correctness. FILES
/usr/share/zoneinfotime zone information directory /etc/localtime local time zone file SEE ALSO
gettimeofday(2), getenv(3), time(3), tzfile(5), environ(7) NOTE
The return values point to static data whose content is overwritten by each call. The tm_zone field of a returned struct tm points to a static array of characters, which will also be overwritten at the next call (and by calls to tzset). 4th Berkeley Distribution November 27, 1996 CTIME(3)