JS 获得两个时间间隔天数

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J#HTML

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>

</head>
<body>
<input type=text value="2008-02-04" id="gmtStartDay">
<input type=text value="2008-03-04" id ="gmtEndDay">
<input type=button id=bt value="OK" onclick="javascript:checkDiffDays();"/>
</body>
<script language=javascript>

//计算两个日期的差值,并弹出窗口，提醒错误
function checkDiffDays() {
    var gmtStartDay = document.getElementById("gmtStartDay").value;
    var gmtEndDay = document.getElementById("gmtEndDay").value;
    var diffDays = getDiffDays(gmtStartDay,gmtEndDay);
	if (diffDays > 90) {
		alert("间隔时间无效，间隔时间不能大于90天！");
		return false;
	}
	alert(diffDays);
	return true;
}


//得到两个日期的间隔时间的天数
function getDiffDays(date1,date2) {
    var regexp=/^(\d{1,4})[-|\.]{1}(\d{1,2})[-|\.]{1}(\d{1,2})$/;
    var monthDays=[0,3,0,1,0,1,0,0,1,0,0,1];
    regexp.test(date1);
    var date1Year=RegExp.$1;
    var date1Month=RegExp.$2;
    var date1Day=RegExp.$3;

    regexp.test(date2);
    var date2Year=RegExp.$1;
    var date2Month=RegExp.$2;
    var date2Day=RegExp.$3;
	
	if (validatePeriod(date1Year,date1Month, date1Day, date2Year, date2Month, date2Day)) {
		var firstDate = new Date(date1Year, date1Month, date1Day);
		var secondDate = new Date(date2Year, date2Month, date2Day);
		
		var result = Math.floor((secondDate.getTime() - firstDate.getTime()) / (1000*3600*24));
		for(j = date1Year; j < date2Year; j++) {
			if (isLeapYear(j)) {
				monthDays[1] = 2;
			} else {
				monthDays[1] = 3;
			}
			for(i = date1Month -1 ; i < date2Month; i++) {
				result = result - monthDays[i]
			}
		}
		return result;
	} else {
		return ;
	}
	if(validatePeriod(date1Year,date1Month,date1Day,date2Year,date2Month,date2Day)){
    	firstDate=new Date(date1Year,date1Month,date1Day);
         secondDate=new Date(date2Year,date2Month,date2Day);
      
         result=Math.floor((secondDate.getTime()-firstDate.getTime())/(1000*3600*24));
         for(j=date1Year;j<=date2Year;j++){
             if(isLeapYear(j)){
                 monthDays[1]=2;
             }else{
                 monthDays[1]=3;   
             }
             for(i=date1Month-1;i<date2Month;i++){
                 result=result-monthDays[i];
             }
         }
         return result;
     }else{
      return 'the first field must before the second date.';
     }
}

//判断年份是否是闰年
function isLeapYear(year) {
	if (year % 4 == 0 && (year % 100 != 0) || (year % 400 == 0)) {
		return true;
	}
	return false;
}

//判断前后两个日期
function validatePeriod(fyear, fmonth, fday, byear, bmonth, bday) {
	if (fyear < byear) {
		return true;
	} else if (fyear == byear) {
		if (fmonth < bmonth) {
			return true;
		} else if (fmonth == bmonth) {
			if (fday <= bday) {
				return true;
			} else {
				return false;
			}
		} else {
			return false;
		}
	} else {
		return false;
	}
}
</script>
</html>