build_time_t check_system_link_file compare_tm get_timezone_offset identify_system_timezone MAX_TEST_TIMES perfect_timezone_match pg_load_tz pg_TZDIR pgfnames pgfnames_cleanup scan_available_timezones score_timezone select_default_timezone T_DAY T_MONTH T_WEEK tzdirpath validate_zone zone_name_pref

T_MONTH #define T_MONTH   ((time_t) (60*60*24*31))