Do you plan dinner menus ahead of time, or the day of?

I try to plan my menus in advance-subject to change of course.

My son works at an upscale grocery store that sells mostly organic. We buy fresh food every day. We get what's on sale and what looks good. We have almost no food waste.

I plan meals by the week, before I go to the grocery store. I hate wasting time or money. Here are some recent dinner plans; send me a message offlist if you have any questions, or would like any recipes.
Week of 11/1
Sunday – chili
Monday – peanut noodles
Tuesday – stirfry
Wednesday – lasagna
Thursday – curry
Friday – breakfast: oatmeal pancakes and fruit salad
Saturday – out

Week of 10/25
Sunday – bean and vegetable sloppy joes
Monday – Mexican lasagna
Tuesday – southwest falafel
Wednesday – stirfry
Thursday – zucchini enchiladas
Friday – stroganoff
Saturday – Halloween black and orange quesadillas

Week of 10/18
Sunday – black bean soup, quesadillas, avocado salad
Monday – lentil tacos
Tuesday – mushroom stroganoff
Wednesday – stirfry
Thursday – peanut noodles
Friday – Mediterranean stew

funny you should ask.... at this moment I am printing out week by week from my gmail calendar the month of nov.

Usually I plan week by week but we have house guests this month and Im doing the 3 day breast cancer walk so I am doing more extensive planing.... that way I can make some items in batches of 2 or 3 to cover multiple dinners.

Weekly plan

bi-weekly menu
I also make 2 of everything and freeze a meal.
Pull and heat when needed.

I plan meals for a month. It takes some time but it sure takes care of the hassle of trying to decide what's for dinner at 5 p.m.

I make a menu of meals for the week, but it's always subject to change. I make sure that when I go grocery shopping, I'll have enough for at least 7 meals in the house. But if I decide that I don't want (or don't have time to make) whatever's on the menu for one night, I can switch it up with another meal.

I make a 2 week menu out and then go grocery shopping. I don't have it mapped for day to day but i do know what we are having in a 14 day time period.

I plan what I'm going to make for the week so I can do my shopping accordingly. But I don't plan it day by day. It's more of, "We'll have lasagna, spaghetti, pizza, etc. this week," instead of, "We'll have lasagna Sunday, spaghetti Monday, pizza Tuesday, etc." That way I can make whatever I feel like making that night, but the semi-schedule helps me make sure I've got what I need to make it without having to make an extra trip to the store.