//预产期&四维时间计算器
function testYZ() 
{
    if (document.health.year.value == "" || document.health.month.value == "" || document.health.day.value == "") {
        alert("请填写完整年月日!");
        return false;
    }
    if (document.health.year.value > 2050 || document.health.year.value < 1990) {
        alert("请填写正确年份!");
        document.health.year.focus();
        return false;
    }
    if (document.health.month.value > 12 || document.health.month.value < 1) {
        alert("请填写正确月份!");
        document.health.month.focus();
        return false;
    }
    if (document.health.day.value > 31 || document.health.day.value < 1) {
        alert("请填写正确日子!");
        document.health.day.focus();
        return false;
    }
    if (!isDate(document.health.year.value, document.health.month.value, document.health.day.value)) {
        alert("年月日组合有错,请重新填写!");
        return false;
    }

    function isDate(year, month, day) {
        // month argument must be in the range 1 - 12
        month = month - 1; // javascript month range : 0- 11
        var tempDate = new Date(year, month, day);
        if ((year2k(tempDate.getFullYear()) == year) && (month == tempDate.getMonth()) && (day == tempDate.getDate())) {
            return true;
        }
        else {
            return false;
        }
    }

    function year2k(d) {
        return (d < 1000) ? d + 1900 : d;
    }
   
    var m = parseInt(document.health.month.value,10)-1;
    var stime = new Date(document.health.year.value,m,parseInt(document.health.day.value,10));
    var yuchan2 = new Date(document.health.year.value,m,parseInt(document.health.day.value,10));
	
	var tail=[health.year.value,health.month.value,health.day.value];
	tail=(new Date(tail.join('/'))).getTime();////你的末次月经时间的毫秒表示
	
	//将末次月经第一天+平均月经周期天数+252天
	var ycq=new Date(tail+(30+252)*86400000);//预产期日期
	var tailmon=ycq.getMonth()+1;
    var nowt = new Date();
	var nowtime = nowt.getTime();
	var chatime = nowtime - Date.parse(stime);
	var chaweek = Math.floor((chatime) / (1000 * 60 * 60 * 24 * 7));
	var ccday = chaweek*7;
	if (chaweek < 3) chaweek = 0;
	if (chaweek > 43) alert("亲，您的预产期已经过了!");
	var days;
	var days1;
	if (chaweek < 42 && chaweek > 0){
		days = 133;
		days1 = 85;
	}
	if (chaweek < 30 && chaweek > 28){
		days = 91;
		days1 = 71;
	}
	if (chaweek > 43 || chaweek == 0){
		days = 0;
		days1 = 0;
	}
	
	if (chaweek == 0){
		$(".date").text(" ");
		$(".date1").text("亲，您还没有怀孕吧！");
	}else if(chaweek>43){
		$(".date").text(" ");
		$(".date1").text("亲，您的预产期已经过了!");
	}else{
		$(".date").text(ccday);	
		$(".date1").text(ycq.getFullYear() +"年"+tailmon +"月"+ycq.getDate() +"日");
	}
	

}

Date.prototype.format = function(format)
{
 var o ={
		'M+' : this.getMonth()+1, //month
		'd+' : this.getDate(),    //day
		'h+' : this.getHours(),   //hour
		's+' : this.getSeconds(), //second
		'm+' : this.getMinutes(), //minute
		'q+' : Math.floor((this.getMonth()+3)/3),  //quarter 
		'S' : this.getMilliseconds() //millisecond     
	};
   if(/(y+)/.test(format)){format=format.replace(RegExp.$1,(this.getFullYear()+'').substr(4 - RegExp.$1.length));}
  for(var k in o){     
		 if(new RegExp('('+ k +')').test(format)){format = format.replace(RegExp.$1,RegExp.$1.length==1 ? o[k] : ('00'+ o[k]).substr((''+ o[k]).length));}}
 return format; 
};