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<?php define('ROTATE_PERIOD', 2); echo date('Y_m_d_H_') . sprintf("%02d", (floor(date('i') / ROTATE_PERIOD) * ROTATE_PERIOD)); echo "\n"; echo date('Y_m_d_H_', strtotime( '' )); echo "\n"; echo sprintf("%05d", (floor(date('i', strtotime( '-13 minutes' )) / ROTATE_PERIOD) * ROTATE_PERIOD)); echo "\n"; echo strtotime( '-1 days' );

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