Could you correct my English?
Summer time has started from last Sunday in Italy, which changed the time difference from eight hours to seven hours between Italy and Japan. It isn't used in Japan. If it were, it would be nice, but they say adopting summer time there is difficult and meaningless because Japan covers a wide area in north and south. Anyway, I'm off to work now, since it isn't getting dark yet, I feel weird.

Shinji,
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I only needed to correct the first phrase... well done :)
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"Summer time has started from last Sunday in Italy" is not correct. You could write one of the these instead:
Summer time started from last Sunday in Italy. OR Summer time has started in Italy
When referring to a specfic time (last Sunday) do not use "has" or "have" in the verb.
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Regards,
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Jas
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Could you correct my English?
Summer time has started from last Sunday in Italy, which changed the time difference from eight hours to seven hours between Italy and Japan. It isn't used in Japan. If it were, it would be nice, but they say adopting summer time there is difficult and meaningless because Japan covers a wide area in north and south. Anyway, I'm off to work now, since it isn't getting dark yet, I feel weird.