timezone programming question: converting UTC to local time
I am looking for a way to convert a UTC time to the corresponding local time in any given timezone, not necessarily the
timezone that the process is running in. Something like localtime_r(const time_t *utc, const char *name_of_timezone,
struct tm *res) would do. It has to be MT-safe, so I can't just save TZ, change TZ to the desired timezone, call
localtime() and then restore TZ.
[418 byte] By [
mxiong] at [2007-11-25 23:41:41]

# 2
Except for the mapping of placename to timezone, I think most of your questions can be answered by the "ctime" manpage. You'll need a mutex to serialize access to these functions while the TZ is set to a particular value, and I recommend that you use the *_r variant of the calls.
An old, but useful book, "Advanced UNIX Programming" by Marc J. Rochkind, devotes several pages to times, dates, and timezones.
... Dave