import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;public class DateTest { public static void main(String[] args) { Date date = new Date(); Calendar cal = Calendar.getInstance(); cal.setTime(date);//date 换成已经已知的Date对象 cal.add(Calendar.HOUR_OF_DAY, -8);// before 8 hour SimpleDateFormat format = new SimpleDateFormat(yyyy-MM-dd HH:mm:ss); System.out.println(format.format(cal.getTime())); }}
public class Test { public static void main(String[] args) { ListDate dateList = new ArrayList(); dateList.add(DateUtil.stringToDate(2017-11-15 05:55:55)); dateList.add(DateUtil.stringToDate(2017-11-12 05:55:55)); dateList.add(DateUtil.stringToDate(2017-11-10 05:55:55)); System.out.println(Collections.max(dateList)); System.out.println(Collections.min(dateList)); }}