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do_adjust_relative() adds h/i/s to wall-clock fields before converting to a Unix timestamp. Near a spring-forward gap that produces a nonexistent time, which resolves to the wrong offset. Fix: zero out relative h/i/s/us before timelib_update_ts(), apply them to sse directly. Same technique as timelib_add_wall(). y/m/d, weekday relatives, and first_last_day_of still go through timelib_update_ts. Also fixes phpGH-15880.
Always fold microseconds into seconds before SSE arithmetic instead of guarding with if-checks. Handle negative remainders correctly.
Remove section headers and redundant cases. Add -72h backward through fall-back, +61 minutes across spring-forward gap, and DateTimeImmutable.
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