It only closes around a certain time to make it more realistic. You'll be able to go into the restaurant when it's morning in the game.
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the seven stars restaurant is only open between 9a.m and 11p.m
From 9:00 to 23:00.
The Seven Star Restaurant in Pokémon Pearl should be open between 9am and 11pm in-game time. There are currently no reported glitches of it staying closed within its opening times, so just go there and go in.
What has this got to do with Pokemon Diamond.
At level seven it will become either a Cascoon or a Silcoon depending on whether it is a male or female. Then at level 10 it will evolve into a Beautifly or a Dustox.