C#中如何根據月份來確定每月的最大天數

#region 根據月份來確定每月的最大天數  
     
private int SetDate(string time)  
{  
    int intYear;  
    int intMonth;  
    int intDay;             
    string year = time.Substring(0,4);  
    string month = time.Substring(4,2);  
    int.TryParse(year, out intYear);  
    int.TryParse(month, out intMonth);  
    if (intMonth == 02)  
    {  
        if (intYear % 400 == 0 || (intYear % 4 == 0 && intYear % 100 != 0))//判斷是不是閏年    
        {  
            intDay = 29;  
        }  
        else
        {  
            intDay = 28;  
        }  
    }  
    switch (intMonth)  
    {  
        case 04:  
        case 06:  
        case 09:  
        case 11: intDay = 30; break;  
        default: intDay = 31; break;  
    }  
    return intDay;  
}  
#endregion

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