log_timezone pg_get_timezone_name pg_get_timezone_offset pg_gmtime pg_interpret_timezone_abbrev pg_localtime pg_next_dst_boundary pg_strftime pg_time_t pg_timezone_initialize pg_tz pg_tz_acceptable pg_tzenum pg_tzenumerate_end pg_tzenumerate_next pg_tzenumerate_start pg_tzset pg_tzset_offset session_timezone TZ_STRLEN_MAX

pg_tzset_offset() pg_tz * pg_tzset_offset ( long  gmtoffset )