Gets the first day-of-week. !(p) The first day-of-week varies by culture. For example, the US uses Sunday, while France and the ISO-8601 standard use Monday. This method returns the first day using the standard {@code DayOfWeek} enum.
@return the first day-of-week, not null
See Implementation
Gets the first day-of-week. !(p) The first day-of-week varies by culture. For example, the US uses Sunday, while France and the ISO-8601 standard use Monday. This method returns the first day using the standard {@code DayOfWeek} enum.
@return the first day-of-week, not null