Java Date Problem while exporting on excel page

I am 开发者_如何学Goexporting report to excel from .jsp. The date viewed on jsp is in "2010-06-30" format. I want the exact format on excel, but it got changed automatically to "6/30/2010" format on excel file. I also tried by using java.util.Date API, still unable to get same format date on excel.

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but it got changed automatically to "6/30/2010" format on excel file

What is the default format of dates in excel? This is most likely the reason.