Sunday is one of the seven days of the week in general.
Background[]
Sunday is considered the first day of the week (but may be seventh depending on other types of calendars).
In William Shakespeare, in one of his plays, Kate was to be married on sunday;
- "Kate, we will be married o' Sunday."
Behind the scenes[]
Sunday is the only specific day of the week mentioned in any official King's Quest source. It can be assumed that other days of the week exist, but they are not mentioned by name.