Assuming "J.C" refers to Jesus Christ, His birthday is typically celebrated as Christmas, the 25th of December, although His actual birthday has never been accurately pinpointed historically.

One hypothesis is that He was born in the year 6 BC, during the month of March, although some say that the correct timeframe is summer (possibly July). There are a multitude of other guesses, some based on pre-existing (and sometimes conflicting) calendars and traditional Jewish holidays. For more information, visit: http://en.wikipedia.org/wiki/Chronology_of_Jesus#Year_of_birth
Source(s):
http://www.didyouknow.cd/xmas/Jesus.htm
http://en.wikipedia.org/wiki/Chronology_of_Jesus#Year_of_birth

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Well, the best known JC who has a known birthday is JC Penney. He was born Sept. 16th 1875. If you meant someone else you will have to be more specific.
Source(s):
http://en.wikipedia.org/wiki/James_Cash_Penney

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Many expets point to the springtime for the birth of Jesus Christ. I don't recall all the evidence but that seems to be where the scholars like to put it.
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