`DayOfWeek` uses 1-7 for Sun-Sat

[smoelius]

The DayOfWeek implementation expects 1-7 to represent Sun-Sat:

saffron/saffron/src/parse.rs

Lines 338 to 352 in bb34024

	/// A day of the week, 1-7 (Sun-Sat)
	#[derive(Debug, Clone, Copy, PartialEq, Eq)]
	pub struct DayOfWeek(chrono::Weekday);
	impl Sealed for DayOfWeek {}
	impl ExprValue for DayOfWeek {
	const MAX: u8 = 7;
	const MIN: u8 = 1;
	fn max() -> Self {
	Self(chrono::Weekday::Sat)
	}
	fn min() -> Self {
	Self(chrono::Weekday::Sun)
	}
	}

But many Cron sources (e.g., this one) say that 1-7 should represent Mon-Sun, and that 0 should be an additional representation for Sunday.

[Hexagon]

For anyone interested, croner has similar (and more) features but uses standard POSIXand OCPS Cron compliant weekdays (0 is sunday). See https://github.com/Hexagon/croner-rust#why-croner-instead-of-cron-or-saffron