I would suspect that the version of Time::Local installed on your machine is older than version 1.13.

From the changelog:

1.13    2006-08-09

...

- Fixed a bug that occurred around the DST change for Europe/London
  (and probably other time zones with a positive UTC offset). If
  given, the hour immediately after the change (2:00 AM for
  Europe/London), then the returned epoch was 3600 seconds too
  large. Reported by Roger Picton. See RT #11662.

In reply to Re: Timelocal, Localtime Bug? by thundergnat
in thread Timelocal, Localtime Bug? by alanonymous

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