On Sabbaths and Jewish holidays. (The holidays can occur on any day of the week.)
Friday
September 11th can be on any day of the week
On a very hot day that continues for a week
Tuesday- D-Day occurred on a Tuesday.
The time of day or day of week does not seem to matter.
Thursday
Tuesday
Saturday.
It was a Thursday.
Monday
There is no day of the week that can be said to have the most sunlight.