date: date doesn't accept spaces after month

[Devel08]

discovered by @cakebaker in #14614
uutils:

$ cargo run date -d "01.01. 2008 3:00 p.m."
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
     Running `target/debug/coreutils date -d '01.01. 2008 3:00 p.m.'`
date: invalid date '01.01. 2008 3:00 p.m.'

GNU:

$ date -d "01.01. 2008 3:00 p.m."
Tue Jan  1 03:00:00 PM EET 2008

Tests

coreutils/tests/by-util/test_date.rs

Lines 3306 to 3310 in 41c3451

	#[test]
	#[ignore = "GNU compat: see uutils/coreutils#14649"]
	fn test_date_allow_spaces_after_month() {
	new_ucmd!().arg("01.01. 2008 03:00 p.m.").succeeds();
	}