there will be an error (time difference) of one hour.

Not quite. The result is sometimes a day off. There are no hours in the output, so I don't know how it can be an hour off.

During one hour of the year, the returned date will be only 13 days away, and
during another hour of the year, the returned date will be 15 days away.

In reply to Re^5: Adding to a date using Time::localtime by ikegami
in thread Adding to a date using Time::localtime by Anonymous Monk

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