KarpelesLab / strtotime / 24114079161

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Fix PHP bugs: DST spring-forward, multi-relative, AM/PM time format

Bug fixes:
- addDaysPHP: detect DST gap clock shift and use duration-based add
  (PHP falls forward past gap, Go falls backward)
- parseDateTimeFormat: reject when unconsumed text follows timezone
  offset, preventing "-10 day" from being parsed as TZ offset -10:00
- parseDateTimeTZRelative: support multiple relative expressions
  ("2004-04-07 00:00:00 -10 day +2 hours")
- parseTimeBeforeDate: handle "HH:MM:SS AM/PM" format with separate
  AM/PM token ("10:00:00 AM July 1 2005 UTC")

Add 10 new test cases from PHP bug regressions to CSV.

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

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