Passage: On 1 July 2013, Okazaki moved to 1. FSV Mainz 05. He scored his first goal for Mainz on his debut in a 3–2 win against his former club Stuttgart on the opening matchday of the 2013–14 Bundesliga season. At the end of the season he ended with 15 league goals.

Question: When did Okazaki move to 1?
1 July 2013