std::time
Weekday
enum Weekday : char (String name, String abbrev)
{
MONDAY = { "Monday", "Mon" },
TUESDAY = { "Tuesday", "Tue" },
WEDNESDAY = { "Wednesday", "Wed" },
THURSDAY = { "Thursday", "Thu" },
FRIDAY = { "Friday", "Fri" },
SATURDAY = { "Saturday", "Sat" },
SUNDAY = { "Sunday", "Sun" },
}