Same to you

Swiss speakers of English tend to say "same to you" where I would say "you too": that is, after someone says something nice like "have a good time" or "have a nice day." I would only say "same to you" after something mean, as a response to an insult, say. I assume this is just a feature of my personal usage; other native speakers of English must use "same to you" the same way the Swiss do, or they wouldn't put it that way, presumably. But perhaps it's a Helvetism from Swiss German or from French? In any case, this morning when my daughter Sara wished me a nice morning when she left for kindergarten, I said, "You too!" (Sometimes, I think I should say REM instead of U2.)