private static int millisToDays ( long millisLocal ) { // We assume millisLocal is midnight of some date. What we are basically trying to do // here is go from local-midnight to UTC-midnight (or whatever time that happens to be). long millisUtc = millisLocal + localTimeZone . getOffset ( millisLocal ) ; int days ; if ( millisUtc >= 0L ) { days = ( int ) ( millisUtc / MILLIS_PER_DAY ) ; } else { days = ( int ) ( ( millisUtc - 86399999 /*(MILLIS_PER_DAY - 1)*/ ) / MILLIS_PER_DAY ) ; } return days ; }
Return number of days since the unix epoch .