Java求出人生中第多少天

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package smile.xlw.test;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;/** * 描述：<br> * 作者：liqijing <br> * 修改日期：2015-5-23下午07:58:08 <br> * E-mail: lijinginsistsmile@163.com <br> */public class DateTime {public static void main(String[] args) { int count = getday("1994-07-25"); System.out.println("人生中第"+count+"天"); String date = getReDay(7607,"1994-07-25"); System.out.println(date);  String dateTime = getReservationVisiDay(10); System.out.println("十天后："+dateTime);}/** * 方法名称: getday<br> * 描述：根据你输入出生日期到当今天人生中第多少天 * 例如：1994-07-25到2015-05-23（7607） * 作者: lijing * 修改日期：2015-5-23下午07:35:40 * @param date * @return */public static int getday(String date){SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");Date time = null ;try {time = sdf.parse(date);} catch (ParseException e) {// TODO Auto-generated catch blocke.printStackTrace();}Calendar cal = Calendar.getInstance();cal.setTime(new Date());Calendar endday = Calendar.getInstance();cal.setTime(time);return getIntervalDays(cal, endday);}/** * 方法名称: getIntervalDays<br> * 描述：根据你输入出生日期到当今天人生中第多少天 * 1994-07-25到2015-05-23（7607） * 作者: lijing * 修改日期：2015-5-23下午07:35:37 * @param startday * @param endday * @return */ public static int getIntervalDays(Calendar startday,Calendar endday){       if(startday.after(endday)){   Calendar cal=startday;   startday=endday;   endday=cal;}    long sl=startday.getTimeInMillis();long el=endday.getTimeInMillis();long ei=el-sl;           return (int)(ei/(1000*60*60*24));}  /** * 方法名称: getReservationVisiDay<br> * 描述：当前日期加+day * 例如：当期日期2015-05-23+10() * 作者: liqijing * 修改日期：2015-5-23下午07:17:23 * @param day * @return */public static String getReservationVisiDay(int day){String thatDay = "" ;if("今天".equals(day)){thatDay = new SimpleDateFormat("yyyy-MM-dd").format(new Date());} else {Calendar cal = Calendar.getInstance();cal.setTime(new Date());cal.add(Calendar.DATE, day);thatDay = (new SimpleDateFormat("yyyy-MM-dd")).format(cal.getTime());}return thatDay ;}/** * 方法名称: getReDay<br> * 描述：根据你传入天数，出生日期 * 作者: liqijing * 修改日期：2015-5-23下午07:35:34 * @param day * @return */public static String getReDay(int day,String dayTime){String thatDay = "" ;Date date = null;try {date = new SimpleDateFormat("yyyy-MM-dd").parse(dayTime);} catch (ParseException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}if("今天".equals(day)){thatDay = new SimpleDateFormat("yyyy-MM-dd").format(new Date());} else {Calendar cal = Calendar.getInstance();cal.setTime(date);cal.add(Calendar.DATE, day);thatDay = (new SimpleDateFormat("yyyy-MM-dd")).format(cal.getTime());}return thatDay ;}}
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