question: public static Date daysAfterWithoutTimeZone ( Date dateInst , int numDays ) { if ( ( numDays <= 0 ) || ( dateInst == null ) ) { throw new IllegalArgumentException ( ) ; } final long daysInMillis = numDays * MILLIS_IN_DAY ; return new Date ( dateInst . getTime ( ) + daysInMillis ) ; }
target:  Return the days After without impact of timezone.