java - Date returned by resultset.getString was wrong at some time -

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i using mysql database.here have datetime field in table , in java code value using resultset.getstring method.it works fine returns wrong date or previous date.

here java code:

resultset.getstring("date_of_schedule")

it returns '2015-09-21' correctly return '2015-09-20' date.can explain me doing wrong.


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