March 15th seems like the correct date but maybe the fact that february is short screws that up a little bit. If he has a warrant for not paying a fine, that could also push the release date back a little bit. The jail would probably explain it to him if he asked. Sentence credit calculation errors are pretty common. Attorneys, judges and jailors didn't get where they are by being good at math ;) Good luck!
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Well good time is calculated by the jail, however normally a peron serves 4 of 6 months. So his out date would be in march...not February
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I agree with the first two answers.
The reason March 15th is correct is you get one day of good time for every 4 days served without incident. So, it is not 2/3 good time. It is 1/5 or 20%.
You also have to subtract any credit for time served he receive prior to beginning his sentence (i.e., night of his arrest, days it took for bail to be posted, etc.)