日期格式验证

以前写了几个日期格式的验证，但是都不太完美。在网上搜了一下，并测试了这个用正则表达式的验证，非常完美其，而且还有瑞年判断。(代码并非本人所写)

1、用正则表达式验证日期格式(C#) 

/**//// <summary>
        /// 验证日期格式
        /// </summary>
        /// <param name="dtime">日期字符串</param>
        /// <returns>bool</returns>
        public static bool IsDateTime(string dtime)
        ...{
            bool flag = true;
            string strMode = @"^((d{2}(([02468][048])|([13579][26]))[-/s]?
                    ((((0?[13578])|(1[02]))[-/s]?((0?[1-9])|([1-2][0-9])|(3[01])))|
                    (((0?[469])|(11))[-/s]?((0?[1-9])|([1-2][0-9])|(30)))|
                    (0?2[-/s]?((0?[1-9])|([1-2][0-9])))))|(d{2}(([02468][1235679])|
                    ([13579][01345789]))[-/s]?((((0?[13578])|(1[02]))[-/s]?((0?[1-9])|
                    ([1-2][0-9])|(3[01])))|(((0?[469])|(11))[-/s]?((0?[1-9])|([1-2][0-9])|
                    (30)))|(0?2[-/s]?((0?[1-9])|(1[0-9])|(2[0-8]))))))";
            Regex dt = new Regex(strMode,RegexOptions.Compiled);
            Match m = dt.Match(dtime);

            if(!m.Success)
            ...{
                flag = false;
            }
            return flag;
        }

2、JavaScript 实现的日期格式验证

<script  language="javascript" type="text/javascript">
 function ChkBirthday(sender, args) 
        ...{ 
            var check=/^([1-2]d...{3})-(0?[1-9]|11|12|10)-([1-2]?[0-9]|0[1-9]|30|31)$/;
            if(Form1.Birthday.value!="")
            if (!check.exec(Form1.Birthday.value)) 
            ...{    
              args.IsValid = false; 
            }
            else
            ...{
              var y=(Form1.Birthday.value).split("-")[0];
              var m=(Form1.Birthday.value).split("-")[1];
              var d=(Form1.Birthday.value).split("-")[2];
                if(m==1||m==3||m==5||m==7||m==8||m==10|m==12)
                ...{
                    if(d<0||d>31)
                    ...{
                        args.IsValid = false;
                    }
                    else
                    ...{
                        args.IsValid = true; 
                    }
                }
                else
                ...{
                    if(m==2)     //平月
                    ...{
                        if(y%400==0||(y%4==0&&y%100!=0))       //闰年
                        ...{
                            if(d<1||d>29)
                            ...{args.IsValid = false;}
                            else
                            ...{args.IsValid = true;}
                        }
                        else       //平年
                        ...{
                            if(d<1||d>28)
                            ...{args.IsValid = false;}
                            else
                            ...{args.IsValid = true;}
                        }      
                    }
                    else          //小月
                    ...{
                        if(d<1||d>30)
                        ...{args.IsValid = false;}
                        else
                        ...{args.IsValid = true;}
                    }
                }
              }
              }
        // --> 
        </script>