Final answer:
The prince moves up the wedding time because he wants to get married as soon as possible.
Step-by-step explanation:
The prince moves up the wedding time because he wants to get married as soon as possible. This can be seen in the examples from the references, such as the quote from 'The Wedding-Journey of a Princess' which states 'They had decided to be married as soon as possible'. It is common for couples to want to start their life together as soon as they can, so the prince is likely eager to marry the person he loves.