critical impact:

tm data structure - differences (CrCh117)

Problem description

The tm_gmtoff and tm_zone fields are not available in the tm data structure on HP-UX.

On Tru64 UNIX, the tm_gmtoff field in the tm data structure specifies the seconds east of Greenwich (UTC). For example, -18000 means 5 hours west of Greenwich. The tm_zone field is a string that is an abbreviation for the current time zone (for example, EST, PDT, GMT).

Identifiers

tm_gmtoff

tm_zone

See also

• Background information on date and time impacts
• timezone(3)

Solution description

Modify your code.

If your application makes use of the tm_gmtoff and tm_zone structure fields, modify it to use the HP-UX timezone and tzname external variables. For example:

tm_gmtoff = -timezone
tm_zone   = tzname[tm_isdst]

Note: It is no longer possible to have different a tm data structure using different time zone information. Time zone information is global across a single process.

The TZ environment variable is also interpreted differently. Please review the impact statement on the tzset routine for more information.

See also

• ctime(3C)
• CrCh29 timezone - time zone data is implemented differently

Problem summary