The first thing to remember is that every day of the week is different, so you need to adapt to what makes each day unique.
Most people work outside their home for a living, so they are busy working during the day Monday through Friday.
Friday evenings and Saturdays are usually the best times to get together with friends. But you can’t wait until Friday or Saturday to make plans with them because by then they will already have made them. So Monday, Tuesday, or Wednesday are good days for making plans with friends.
The season matters too. In the northern hemisphere, days are longer in summer than winter, so there is more daylight in the evening then. Warmer too.
Your energy level changes throughout the day too, so you should try to do things that require more mental effort when you’re at your most alert. Early afternoon is usually not a good time for this.