按周獲取時間

給出年份，周次獲取給定年份的給定周次的開始日期和結束日期

Java代碼

public static String[] getDate(int year,int week){

//		Calendar ca = Calendar.getInstance();
//			ca.set(Calendar.WEEK_OF_YEAR, 47);
	//year,week,
	int  year1, year2, month1, month2, day1, day2,  sum = 0;       
	int[] days = new int[] { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };   //閏年
	int i;      
//	Scanner scan = new Scanner(System.in);      
//	System.out.print("年：");       
//	year = scan.nextInt();       
//	System.out.print("周次：");       
//	week = ((Scanner) scan).nextInt();       
	if (year < 0) {       
		System.out.println("年份錯誤，必須大於等於0");   
		return null;        }      
	if (week < 1 || week > 54) {   
		System.out.println("周次錯誤，必須位於 1 .. 53 之間");   
		return null;      
		}        
	sum += 7 * (week - 1);   
	//修正總天數     
	Calendar c = Calendar.getInstance();   
	c.set(year, 0, 1);       
	switch (c.get(Calendar.DAY_OF_WEEK))      
	{            
	case Calendar.TUESDAY:     
	{                  
		sum -= 1;             
		break;           
		}         
	case Calendar.WEDNESDAY:   
	{                    
		sum -= 2;       
		break;           
		}         
	case Calendar.THURSDAY:        
	{                   
		sum -= 3;       
		break;                } 
	case Calendar.FRIDAY:           
	{                   
		sum -= 4;            
		break;              
		}          
	case Calendar.SATURDAY:     
	{                  
		sum -= 5;       
		break;           
		}        
	case Calendar.SUNDAY:    
	{                  
		sum -= 6;                 
		break;              
	}         
	default:              
		break;    
	}      
	if ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0)) 
	{            days[1] = 29;        }      
	for (i = 0; i < days.length; i++) {       
		if (sum >= days[i]) {             
			sum -= days[i];  
			}           
		else {      
			break;        
			}        }     
	year1 = year;      
	month1= i + 1;     
	day1 = sum + 1;                //修改開始日期    
	if (day1 < 1)  {           
		day1 += days[11];           
		month1 = 12;        
		year1--;        }   
	year2 = year1;       
	month2 = month1;      
	day2 = day1 + 6;  
	if (day2 > days[month1 - 1]) { 
		day2 -= days[month1 - 1];     
		month2++;          
		if (month2 > 12) {         
			month2 = 1;       
			year2++;            
			}        
		}   
	String[] sarr = new String[2];
	String	ma,da,mb,db;
		if(month1<10){
			ma = "0"+month1;
		}else{
			ma = month1+"";
		}
		if(month2<10){
			mb = "0"+month2;
		}else{
			mb = month2+"";
		}
		if(day1<10){
			da = "0"+day1;
		}else{
			da = day1+"";
		}
		if(day2<10){
			db = "0"+day2;
		}else{
			db = day2+"";
		}
	sarr[0] = year1+"-"+ma+"-"+da+" 00:00:00";
	sarr[1] = year2+"-"+mb+"-"+db+" 23:59:59";	
	System.out.printf("%d年第%d周 : %d年%d月%d日 ~ %d年%d月%d日", year, week, year1, month1, day1, year2, month2, day2);
			return sarr;
	}