If you are the home side I think you have to give 24 hours notice!
That's strange, especially with July's response, as I had a CL match too close to a league match, but was only home for the CL match. I was able to change it to a later time 2 hours before the match was originally due to play.
Rhondda Rovers (The Rebirth) - Season 5, Level 3
Career Progress:
League Titles - 3 Cup Winners - 1 Champions League Winners - 1