判断输入日期格式是否正确！

int Date(const char * strDate)
{
	char strYear[5],strMonth[3],strDay[3];
	int iYear=0,iMonth=0,iDay=0;
	
	memset(strYear,0,sizeof(strYear));
	memset(strMonth,0,sizeof(strMonth));
	memset(strDay,0,sizeof(strDay));
	
	if(strDate==NULL) 
	{
		return 0;
	}
	
	if(strlen(strDate)!=8) 
	{
		return 0;
	}
	
	if(isN(strDate)==-1) 
	{
		return 0;
	}
	
	memcpy(strYear,strDate,4);
	memcpy(strMonth,strDate+4,2);
	memcpy(strDay,strDate+4+2,2);
	
	iYear=atoi(strYear);
	iMonth=atoi(strMonth);
	iDay=atoi(strDay);
	
	if((iYear<1900) || (iYear>2056)) 
	{
		return 0;
	}
	
	if(iMonth<1 || iMonth>12) 
	{
		return 0;
	}
	
	switch(iMonth)
	{
		 case 1: case 3: case 5: case 7: case 8: case 10: case 12:
		 	 if(iDay<1 || iDay>31) 
		 	 {
		 	 	return 0;
		 	 }
		 	 break;
		 case 4: case 6: case 9: case 11:
		 	 if(iDay<1 || iDay>30) 
		 	 {
		 	 	return 0;
		 	 }
		 	 break;
		 case 2:
		   if(iYear % 4 ==0 && iYear % 100 !=0 || iYear % 400 ==0)	/*是闰年*/
		   {
		   	 if(iDay<1 || iDay>29) 
		   	 {
		   	 	return 0;
		   	 }
		   }
		   else
		   {
		     if(iDay<1 || iDay>28) 
		     {
		     	return 0;     
		     }
		   }
		 	 break;
	}
	return 1;
}