question: public static boolean isYesterday ( Date date ) { Calendar calendar = Calendar . getInstance ( ) ; calendar . add ( Calendar . DAY_OF_MONTH , - 1 ) ; int nowYear = calendar . get ( Calendar . YEAR ) ; int nowMonth = calendar . get ( Calendar . MONTH ) ; int nowMonthDay = calendar . get ( Calendar . DAY_OF_MONTH ) ; calendar . setTimeInMillis ( date . getTime ( ) ) ; int thenYear = calendar . get ( Calendar . YEAR ) ; int thenMonth = calendar . get ( Calendar . MONTH ) ; int thenMonthDay = calendar . get ( Calendar . DAY_OF_MONTH ) ; return ( thenYear == nowYear ) && ( thenMonth == nowMonth ) && ( thenMonthDay == nowMonthDay ) ; }
target:  Is the specific date yesterday