Readable dates in java

JavaDate.java

/**
 *
 * @author gavindmello
 */

import java.time.*;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;


public class JavaDate {
    
    /*
      Accepts timestamp in long, should be in milliseconds though
    */
    public String getTimeString(long timestamp) {
        Timestamp t = new Timestamp(timestamp);
        String timeString = t.toLocalDateTime().toLocalDate().toString();
        
        String yesterday = LocalDate.now().minusDays(1L).toString();
        String today = LocalDate.now().toString();
        
        
        if (timeString.equals(yesterday)) {
            return "yesterday";
        }
        
        if (timeString.equals(today)) {
            return "today";
        }
        
        SimpleDateFormat sdf = new SimpleDateFormat("MMMM d, yyyy, h:mm a");
        String date = sdf.format(timestamp);
        return date;
    }

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {

        JavaDate s = new JavaDate();
        System.out.println(s.getTimeString((long)1485561600*1000));
        
    }
    
}