I believe I found what I was looking for with commons-io:
Calendar cal = Calendar.getInstance();
cal.add(Calendar.DAY_OF_MONTH, 1 * -1);
Date yesterday = cal.getTime();
System.out.println(yesterday);
// Test for newer files (2nd param [false] = get newer files)
String[] files = dir.list( new AgeFileFilter(yesterday,false) );
for ( int i = 0; i < files.length; i++ ) {
System.out.println(files[i]);
}