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遍歷兩個(gè)日期之間天數(shù)的算法

package pkg.chart;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class Test {
public static void main(String[] args) throws ParseException {
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
Long startM = sdf.parse("2009-1-14").getTime();
Long endM = sdf.parse("2010-1-14").getTime();
long result = (endM - startM) / (24 * 60 * 60 * 1000);
System.out.println("差:" + result + "天");

Date startDate = sdf.parse("2009-01-14");
Calendar startTime = Calendar.getInstance();
startTime.clear();
startTime.setTime(startDate);
for (int i = 0; i < (int)result;i++) {
String str = startTime.get(Calendar.YEAR) + "-"
+ startTime.get(Calendar.MONTH) + "-"
+ startTime.get(Calendar.DAY_OF_MONTH);
System.out.println(str);
startTime.add(Calendar.DAY_OF_YEAR, 1);
}
}
}


package demo;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * 遍歷兩個(gè)日期之間天數(shù)的算法
 *
 */
public class MyTest {
 public static void main(String[] args) throws ParseException {
  String start = "2007-01-27";
  String end = "2008-03-04";
  //字符串轉(zhuǎn)換成日期
  SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd");
  Date startDate=format.parse(start);
  Calendar startTime=Calendar.getInstance();
  startTime.clear();
  startTime.setTime(startDate);
  int startYear = startTime.get(Calendar.YEAR);
  int startMonth = startTime.get(Calendar.MONTH);
  int startDay = startTime.get(Calendar.DAY_OF_MONTH);
  Date endDate=format.parse(end);
  Calendar endTime=Calendar.getInstance();
  endTime.clear();
  endTime.setTime(endDate);
  int endYear = endTime.get(Calendar.YEAR);
  int endMonth = endTime.get(Calendar.MONTH);
  int endDay = endTime.get(Calendar.DAY_OF_MONTH);
  System.out.println("注意西方的月份從0到11，中國(guó)的月份從1到12");
  System.out.println("下面輸入的是中國(guó)的日期.注意其中的轉(zhuǎn)換問(wèn)題");
  System.out.println("start date : " + start);
  System.out.println("end date : " + end);
  
  int count = 0;
  for (int x = startYear; x <= endYear; x++) {
   //羅馬歷法產(chǎn)生年份公元1582年
   int gregorianCutoverYear = 1582;
   boolean isLeapYear = x >= gregorianCutoverYear ?
     ((x%4 == 0) && ((x%100 != 0) || (x%400 == 0))) :
      (x%4 == 0);
   //判斷是否是閏年
   //java方法
   //boolean isLeapYear = (new GregorianCalendar()).isLeapYear(x);
   
   String isBigYear = "是平年";
   if (isLeapYear) {
    isBigYear = "是閏年";
   }
   System.out.println(x + "年" + isBigYear);
   
   //獲取開(kāi)始月的最大天數(shù)
   //java方法
   //SimpleDateFormat aFormat=new SimpleDateFormat("yyyy-MM-dd");
   //Date date = aFormat.parse(start);
   //Calendar time = Calendar.getInstance();
   //time.clear();
   //time.setTime(date);
   //int max=time.getActualMaximum(Calendar.DAY_OF_MONTH);//本月份的天數(shù)
   //System.out.println(max);
   
   //獲取開(kāi)始月的最大天數(shù)；大月是1，3，5，7，8，10，12；小月是4，6，9，11；特殊月是2
   int max = 0;
   if (startMonth == 1) {
    if (isLeapYear) {
     max = 29;
    }
    if (!isLeapYear) {
     max = 28;
    }
   }
   if (startMonth == 3 || startMonth == 5 || startMonth == 8 || startMonth == 10) {
    max = 30;
   }
   if (startMonth == 0 || startMonth == 2 || startMonth == 4 || startMonth == 6 || startMonth == 7 || startMonth == 9 || startMonth == 11) {
    max = 31;
   }
   
   //循環(huán)每個(gè)月
   //如果在日期范圍內(nèi)月份循環(huán)時(shí)自增到了一年的最后一個(gè)月就將月份初始化到一月份
   int y = 0;
   //如果是開(kāi)始日期的第一個(gè)年的月數(shù)就從開(kāi)始月數(shù)循環(huán)
   if (x == startYear) {
    y = startMonth;
   }
   for (; y < 12; y++) { 
    
    //獲取當(dāng)月的最大天數(shù)；大月是1，3，5，7，8，10，12；小月是4，6，9，11；特殊月是2
    max = 0;
    if (y == 1) {
     if (isLeapYear) {
      max = 29;
     }
     if (!isLeapYear) {
      max = 28;
     }
    }
    if (y == 3 || y == 5 || y == 8 || y == 10) {
     max = 30;
    }
    if (y == 0 || y == 2 || y == 4 || y == 6 || y == 7 || y == 9 || y == 11) {
     max = 31;
    }
    
    int ty = y + 1;
    System.out.println(x + "年" + ty + "月");
    
    //循環(huán)每一天
    int z = 1;
    //如果是開(kāi)始日期的第一個(gè)月的天數(shù)就從開(kāi)始天數(shù)循環(huán)
    if (x == startYear && y == startMonth) {
     z = startDay;
    }
    for (; z <= max; z++) {
     count++;
     
     System.out.println( x + "年" + ty + "月" + z + "日"); 
     
     if (x == endYear && y == endMonth && z == endDay) {
      break;
     }
    }

    //如果已經(jīng)遍歷過(guò)了截至日期的最后月份就中止月份的循環(huán)
    if (x == endYear && y == endMonth) {
     break;
    }
   
   }
  }
  
  System.out.println(start + " 到 " + end + " 的天數(shù)差：" + count);
  
 }

}

posted on 2009-01-14 11:10 liudecai_zan@126.com 閱讀(4999) 評(píng)論(10)  編輯  收藏 所屬分類: 在路上