java - I cannot update my Date column? error: datatruncation -

mysql datatype column "logindate" date. why error?

private void comparedate(){     sql = "select curdate()";     date currentdate = lastlogin;     try{         ps = con.preparestatement(sql);         rs = ps.executequery();         while(rs.next()){             currentdate = rs.getdate(1);         }     }catch(sqlexception e){         system.out.println(e);     }      if(currentdate.compareto(lastlogin) == 1){         system.out.println(currentdate);         system.out.println(lastlogin);         sql = "update customers set logindate="+currentdate+", nflixcredit=3 username='"+username+"'";         try{             ps = con.preparestatement(sql);             ps.executeupdate();         }catch(sqlexception e){             system.out.println(e);         }     } } 

2015-05-30

2015-05-29

error -

com.mysql.jdbc.mysqldatatruncation: data truncation: incorrect date value: '1980' column 'logindate' @ row 1

what using not prepared statement.

change to

   sql = "update customers set logindate=?, nflixcredit=3 username=?";     try{         ps = con.preparestatement(sql);         ps.setdate(1,currentdate);         ps.setstring(2,username);         ps.executeupdate();     }catch(sqlexception e){ 

in case tostring() method of date called , date long