A lot of stuff on the Sims 3 happens at a certain time every day. These things can be important to know. So I would like to make a compilation of all of them. If you have one, post it and I will add it.
I'll start off:
Time that Nectar ages: 12:00 A.M.
Time that sprinklers go on when upgraded to auto-water: 4:00 A.M.
Time when you can call/invite people over: 6:00 A.M.
Time that Death Fish spawn surface at the graveyard: 12:00 A.M.
Time the relic stores restock: 12:00 A.M.
Time plants grow: 5:00 A.M.
Aging time, no birthday cake: 8:00 P.M.
Vacation ending time: 24:00 or 12:00 A.M.
Bistro opens at: 11:00 A.M.
Time to claim money from businesses: 9:00 A.M. on Mondays
5/10/15/20% off sales at grocery store/bookstore start at: 9:00 A.M.
Mail comes at: Between 8:00 and 9:00 A.M. (in other words, if i send out a metal to be smelted at 7:30 A.M., I will still get it at 9:00 A.M. when the mail comes that day
Time where its too late to chat/hang out with someone: 11:00 P.M.