[Repo Assist] fix(python): DateTime.TryParse preserves Unspecified kind for naive strings; use fromisoformat in DateTimeOffset.parse

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🤖 This is an automated pull request from Repo Assist.

Closes #3654

Root Cause

Bug 1 — DateTime.TryParse with naive strings (date.py)

parse() unconditionally called datetime.fromisoformat(string).astimezone(). For a naive string like "2018-10-01T11:12:55" (no timezone component), fromisoformat returns a naive datetime with tzinfo=None. Calling .astimezone() on a naive datetime first assumes the input represents local wall-clock time and then converts it to a timezone-aware datetime in the local timezone. This produced DateTimeKind.Local instead of the correct DateTimeKind.Unspecified.

Bug 2 — DateTimeOffset.parse robustness (date_offset.py)

parse() always delegated to dateutil.parser.parse, even for ISO 8601 strings that Python 3.12+'s built-in datetime.fromisoformat() handles correctly and without extra dependencies.

Fix

date.py — only call .astimezone() when fromisoformat returns a timezone-aware datetime:

parsed = datetime.fromisoformat(string)
if parsed.tzinfo is not None:
    return parsed.astimezone()
return parsed  # Keep naive datetime as-is (DateTimeKind.Unspecified)

date_offset.py — try fromisoformat first, fall back to dateutil for non-ISO formats:

try:
    parsed_dt = datetime.fromisoformat(string)
except ValueError:
    from dateutil import parser
    parsed_dt = parser.parse(string)

This means "2018-07-02T12:23:45+02:00" is now parsed via the stdlib (faster, no timezone ambiguity), while "9/10/2014 1:50:34 PM" still goes through dateutil as before.

Tests Added

• test DateTime.TryParse preserves Unspecified kind for naive strings — verifies "2018-10-01T11:12:55" gives DateTimeKind.Unspecified and the correct date/time values
• test DateTimeOffset.TryParse with timezone offset returns correct value — verifies "2018-07-02T12:23:45+02:00" round-trips correctly to DateTimeOffset(2018, 7, 2, 12, 23, 45, 0, TimeSpan.FromHours(2.))

Trade-offs

• The date_offset.py change does NOT use dateutil for ISO strings, but dateutil is still used as a fallback. No existing tests lose coverage.
• The date.py fix aligns DateTimeKind semantics with .NET behaviour. Existing tests that only check year/month/day sums are unaffected; tests relying on timezone-aware results for naive strings would need to be fixed (none currently exist).

Note

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[github-actions]

Python Type Checking Results (Pyright)

Metric	Value
Total errors	18
Files with errors	4
Excluded files	4
New errors	✅ No

Excluded files with errors (4 files)

These files have known type errors and are excluded from CI. Remove from pyrightconfig.ci.json as errors are fixed.

File	Errors	Status
temp/tests/Python/test_applicative.py	12	Excluded
temp/tests/Python/test_hash_set.py	3	Excluded
temp/tests/Python/test_nested_and_recursive_pattern.py	2	Excluded
temp/tests/Python/fable_modules/thoth_json_python/encode.py	1	Excluded