tzdataアップデート

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かなり前ですがサマータイムの施行日が変更されています。日本は全く関係ありませんが、ちょこちょことDSTを採用する国があったり、もともとサポートしていなかったのでサポートした国があったりといろいろあるのでtzdataをアップデートすることにしました。

tzdataはただのデータなのでそれだけでは何も利用することはありませんが、仮にシステムの環境変数TZが定義されていなかった場合、/etc/localtimeの時間帯を調べます。/etc/localtimeを更新しておかないとUTCになってしまったりといろいろあるのでとりあえずアップデートだけしておきましょう

# cp /usr/share/zoneinfo/Asia/Tokyo /etc/localtime

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