Date parsing rejects valid date 2026-07-31

[Techcable]

Right now the date parsing rejects the date 2026-07-31, as it thinks there are only 30 days in July.

This means the valid nightly version rustc 1.99.0-nightly (ad3d0bc14 2026-07-31) is rejected with a vauge error message.

This is because date.rs:max_days_of_month is implemented incorreclty:

rustversion-detect/src/date.rs

Lines 222 to 228 in b0e37fa

	fn max_days_of_month(x: u32) -> u32 {
	match x {
	1 => 31,
	2 => 29,
	_ => 30 + ((x + 1) % 2),
	}
	}