Just looked for dining reservations, today. For a party of 3
1900 Park Fare - 8:40pm
50's Primetime Cafe - 7:55pm
Artist Point - 7:50pm
Biergarten - 6:35p, 7:25pm
Boatwrights - 7:55pm
Boma - 7:55pm
Bongos - 7:30pm, 7:45pm
California Grill - 9:20pm
Cape May Cafe - 7:30pm
Captains Grille - 7:10pm
Chef Mickey's - 9:15pm
Chefs de France - 8:10pm
Citricos - 7:50pm, 8:05pm
Coral Reef - 8:10pm
Frontera Cocina - 7:30pm
Grand Floridian Cafe - 7:05pm, 7:35pm
Hollywood & Vine - 6:00pm, 6:25pm
House of Blues - 7:45pm
Jiko - 7:50pm, 8:10pm
Skipper Canteen - 8:30pm
Kona Cafe - 8:10pm
La Hacienda de San Angel - 9:00pm
Las Ventanas - 7:00pm, 7:15pm
Liberty Tree Tavern - 8:00pm
Mama Melrose's - 6:35pm, 7:25pm
Maya Grill - 7:30pm, 7:45pm
Moniseur Paul - 7:45pm, 8:00pm
Nine Dragons Restaurant - 6:35pm, 6:50pm
Olivia's Cafe - 7:35pm, 7:50pm
Paradiso 37 - 8:45pm
Raglan Road - 7:30pm
Restaurant Marrakesh - 6:20pm, 7:05pm
San Angel Inn - 8:15pm
Sanaa - 8:25pm
Sci-Fi Dine In - 9:00pm
Teppan Edo - 9:00pm
Boathouse - 8:00pm
Crystal Palace - 8:45pm
Wolfgang Puck - 8:00pm
Garden Grill - 7:55pm
Hollywood Brown Derby - 6:45pm
Turf Club Bar and Grill - 7:45pm
The Wave - 7:20pm, 7:45pm
Tiffins - 7:00pm
Tokyo Dining - 8:10pm
Tony's Town Square Restaurant - 6:15pm
Trail's End - 7:00pm, 7:30pm
Trattoria al Forno - 8:25pm
Tusker House - 7:20pm
Tutto Italia - 8:15pm
Via Napoli - 8:40pm
Whispering Canyon - 7:35pm, 7:50pm
Wolfgang Puck Grand Cafe - 8:30pm
Yachtsman Steakhouse - 8:15pm
So, no, you can't get same day dining anywhere
Sure that's probably not everyday, but at 5:40pm ... look at all that. Are times ideal? Probably not but if people want to be flexible ... and of course it also depends on party size, etc. I chose 3. Someone could choose 1 and see almost nothing. Someone could choose 2 and see half that ... or not. I'm not checking all that, LOL