PHP_DATE_TIMEZONE_GROUP_UTC 2067 ext/date/php_date.c REGISTER_TIMEZONE_CLASS_CONST_STRING("UTC", PHP_DATE_TIMEZONE_GROUP_UTC); PHP_DATE_TIMEZONE_GROUP_UTC 4463 ext/date/php_date.c if (what & PHP_DATE_TIMEZONE_GROUP_UTC && strncasecmp(id, "UTC", 3) == 0) return 1;