Hagrid’s first visit to Harry in Harry Potter and the Philosopher’s Stone, during which he learns that he is a wizard, occurs on his birthday, July 31.
In the movie, the two head to Diagon Alley the next day to buy school supplies before Hagrid takes Harry to King’s Cross Station to catch the Hogwarts Express.
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In the book, however, Harry has to go back to the Dursleys for the rest of the summer. Vernon actually takes him to the station on September 1st, which is when the train leaves for Hogwarts.
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Based solely on what we see in the movie, Harry arrives at Hogwarts a month early.
Moving forward, in almost every movie, the first few chapters of the corresponding book are condensed to get Harry to Hogwarts faster, making his long summers on Privet Drive seem short.