时差程序

import org.apache.commons.lang.time.DateUtils;import java.text.SimpleDateFormat;@Testpublic void testDate() throws Exception {    long t1 = new SimpleDateFormat("dd.MM.yyyy").parse("20.03.2013").getTime();    long now = System.currentTimeMillis();    String result = null;    long diff = Math.abs(t1-now);    if(diff < DateUtils.MILLIS_PER_MINUTE){         result =  "few seconds ago";    }else if(diff < DateUtils.MILLIS_PER_HOUR){         result = (int)(diff/DateUtils.MILLIS_PER_MINUTE) + " minuts ago";    }else if(diff < DateUtils.MILLIS_PER_DAY){        result =  (int)(diff/DateUtils.MILLIS_PER_HOUR) + " hours ago";    }else if(diff < DateUtils.MILLIS_PER_DAY * 2){        result = new SimpleDateFormat("'yesterday at' hh:mm a").format(t1);    }else if(diff < DateUtils.MILLIS_PER_DAY * 365){        result = new SimpleDateFormat(" MMM d 'at' hh:mm a").format(t1);    } else{        result = new SimpleDateFormat("MMM d ''yy 'at' hh:mm a").format(t1);    }    result = result.replace("AM", "am").replace("PM", "pm");    System.out.println(result);}