KarpelesLab / strtotime / 24298518120

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Fix month overflow in "first/last day of next/last month" expressions

When the base date is the last day of a month and the target month has
fewer days (e.g., Jan 31 → Feb), using time.AddDate(0, ±1, 0) overflows
into the following month. Compute the reference using day=1 so "first
day of next month" from Jan 31 correctly lands on Feb 1, not Mar 1.

Fixes parseFirstLastDayOfDate, parseNumberedWeekday, and
tryParseFirstLastDayOfExpression.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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