[Yongthyuan]

With RETURN_TIME_SPAN=True, an out-of-range month span raises ValueError and prevents search_dates() from returning other valid dates in the text:

from datetime import datetime
from dateparser.search import search_dates

search_dates(
    "the past 120000 months. 2024-01-15",
    languages=["en"],
    settings={"RETURN_TIME_SPAN": True, "RELATIVE_BASE": datetime(2026, 11, 3)},
)
# Before: ValueError: year -7974 is out of range
# After: [('2024-01-15', datetime(2024, 1, 15))]

The existing guard handles OverflowError from timedelta arithmetic, but month spans use relativedelta, which raises ValueError when the resulting year is outside the supported range. Catch both exceptions around span generation so an unrepresentable span is omitted while previously parsed dates are retained.

Six regression cases cover past and future month spans, including preservation of another date with both the split and ngram search strategies. All six fail on the unmodified base and pass with the fix.

Validation on macOS arm64, Python 3.12.13, with TZ=UTC:

• pytest tests/test_long_digit_runs.py tests/test_search.py -q: 462 passed, 31 subtests passed.
• pytest -q: 25,313 passed, 9 skipped, 4 xfailed, 508 subtests passed.
• tox -e pre-commit: passed (Ruff lint/format and zizmor).

Other supported Python versions and optional calendar/language-detection dependencies were not tested locally.

Assisted by Codex.

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