BUG: guess_datetime_format fails to infer timeformat

[yuanx749]

• closes BUG: to_datetime fails to infer timeformat depending on hour of day #57452(Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

[yuanx749]

Explanation of the fix:

The previous code below failed for date time str of the kind like "2023-11-09T20:23:46".

In L1006, parsed_formatted is parsed to the same "2023" for both "%H%M" and "%Y", then in L1010 format_guess[0] becomes "%H%M", rather than the correct "%Y". Noticing the order in datetime_attrs_to_format, I thus move "%Y" before "%H%M" to fix the bug.

pandas/pandas/_libs/tslibs/parsing.pyx

Lines 996 to 1013 in 63dc0f7

	for attrs, attr_format, padding in datetime_attrs_to_format:
	# If a given attribute has been placed in the format string, skip
	# over other formats for that same underlying attribute (IE, month
	# can be represented in multiple different ways)
	if set(attrs) & found_attrs:
	continue
	if parsed_datetime.tzinfo is None and attr_format in ("%Z", "%z"):
	continue
	parsed_formatted = parsed_datetime.strftime(attr_format)
	for i, token_format in enumerate(format_guess):
	token_filled = _fill_token(tokens[i], padding)
	if token_format is None and token_filled == parsed_formatted:
	format_guess[i] = attr_format
	tokens[i] = token_filled
	found_attrs.update(attrs)
	break

[MarcoGorelli]

it's been a while since I looked at this function :) taking a look today, thanks for the fix

[MarcoGorelli]

thanks @yuanx749 !