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<?php foreach (\DateTimeZone::listIdentifiers(\DateTimeZone::ALL_WITH_BC) as $tz) { try { new \DateTimeZone($tz); if (preg_match('{\AEtc/GMT[+-]\d+\z}', $tz)) { echo "OK: $tz", PHP_EOL; } } catch (\Throwable $ex) { echo "FAIL: $tz", PHP_EOL; } }
Output for git.master, git.master_jit, rfc.property-hooks
OK: Etc/GMT+0 OK: Etc/GMT+1 OK: Etc/GMT+10 OK: Etc/GMT+11 OK: Etc/GMT+12 OK: Etc/GMT+2 OK: Etc/GMT+3 OK: Etc/GMT+4 OK: Etc/GMT+5 OK: Etc/GMT+6 OK: Etc/GMT+7 OK: Etc/GMT+8 OK: Etc/GMT+9 OK: Etc/GMT-0 OK: Etc/GMT-1 OK: Etc/GMT-10 OK: Etc/GMT-11 OK: Etc/GMT-12 OK: Etc/GMT-13 OK: Etc/GMT-14 OK: Etc/GMT-2 OK: Etc/GMT-3 OK: Etc/GMT-4 OK: Etc/GMT-5 OK: Etc/GMT-6 OK: Etc/GMT-7 OK: Etc/GMT-8 OK: Etc/GMT-9

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