判断是不是同一天，同一周

public static boolean sameDay(Date d0,Date d2){
if(null == d0 || null == d2){
return false ;
}
Calendar c0 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c0.setTime(d0);
c2.setTime(d2);

if(c0.get(Calendar.YEAR) != c2.get(Calendar.YEAR)){
return false;
}

if(c0.get(Calendar.MONTH) != c2.get(Calendar.MONTH)){
return false;
}

if(c0.get(Calendar.DATE) != c2.get(Calendar.DATE)){
return false;
}

return true;
}

public static boolean isSameWeek(Date d0, Date d1) {
Calendar c0 = Calendar.getInstance();
Calendar c1 = Calendar.getInstance();
c0.setTime(d0);
c1.setTime(d1);
int subYear = c0.get(Calendar.YEAR) - c1.get(Calendar.YEAR);
if (0 == subYear) {
if (c0.get(Calendar.WEEK_OF_YEAR) == c1.get(Calendar.WEEK_OF_YEAR))
return true;
} else if (1 == subYear && 11 == c1.get(Calendar.MONTH)) {
if (c0.get(Calendar.WEEK_OF_YEAR) == c1.get(Calendar.WEEK_OF_YEAR))
return true;
} else if (-1 == subYear && 11 == c0.get(Calendar.MONTH)) {
if (c0.get(Calendar.WEEK_OF_YEAR) == c1
.get(Calendar.WEEK_OF_YEAR))
return true;
}
return false;
}