/**
 * Calendar
 */
var _date_cal = null;
function showCalendar(elementName) {
    if (_date_cal == null) {
        _date_cal = new Epoch('_date_cal','popup', document.getElementById(elementName));
    }
    var element = elementName;
    if (typeof elementName == "string") {
        element = document.getElementById(elementName);
    }
    _date_cal.setTarget(element);
    _date_cal.show();

}

function setToday(elementId){
    var today = new Date();
    var year = today.getFullYear();
    var month = today.getMonth()+1;
    if (month < 10){
        month = "0"+month;
    }
    var day = today.getDate();
    if (day < 10){
        day = "0"+day;
    }
    var formatedDate = year+""+month+""+day;
    document.getElementById(elementId).value = formatedDate;
}

function checkDate(date){
    if(date!=""){
        if(isNaN(date)|| date.length!=8){
            return true;
        }
    }
    return false;
}

function checkHour(hour){
    if(hour!=""){
        if(isNaN(hour) || hour > 23|| hour < 0){
            return true;
        }
    }
    return false;
}

function checkMin(min){
    if(min!=""){
        if(isNaN(min)|| min > 59|| min < 0){
            return true;
        }
    }
    return false;
}

/************* 日期檢查 *************
 1.日期字串格式必須為 yyyymmdd.
 2.必須搭配 isLeap() 來判斷閏年.
*************************************/
function dateValidate(dateStr)     
{   
    if(dateStr<0 || isNaN(dateStr) || (dateStr.length != 8))
	{
	    alert("日期格式錯誤, 請用yyyymmdd");
		return false;
	}

    var leap = 28;     
    if (isLeap(parseInt(dateStr.substring(0,4))))   
        leap = 29;     
    var mtmp = parseInt(dateStr.substring(4,6))         
    if (dateStr.substring(4,6) == '08')     
        mtmp = 8;     
    if (dateStr.substring(4,6) == '09')     
        mtmp = 9;  

    if (mtmp < 1 || mtmp > 12)     
    { 
	    alert("月錯誤");
	    return false;     
	}     
    var dayInMonth = new Array(12);     
    dayInMonth[1] = 31;     
    dayInMonth[2] = leap;     
    dayInMonth[3] = 31;     
    dayInMonth[4] = 30;     
    dayInMonth[5] = 31;     
    dayInMonth[6] = 30;     
    dayInMonth[7] = 31;     
    dayInMonth[8] = 31;     
    dayInMonth[9] = 30;     
    dayInMonth[10] = 31;     
    dayInMonth[11] = 30;     
    dayInMonth[12] = 31; 
		
    var dtmp = parseInt(dateStr.substring(6)); 
	if (dateStr.substring(6) == '08')     
        dtmp = 8;     
    if (dateStr.substring(6) == '09')     
        dtmp = 9;  
    if(dtmp < 1 || dtmp > dayInMonth[mtmp])     
    {        
	    alert("日錯誤");
	    return false;    
	}		
	return true;
}


/************* 閏年判斷 **************/ 
function isLeap (Year)     
{     
    if (((Year % 4)==0) && ((Year % 100)!=0) || ((Year % 400)==0))     
        return true;     
    else     
        return false;
}


/************* 字串轉日期 *************
 1.日期字串格式必須為 yyyymmdd.
 2.必須搭配 dateValidate(), isLeap() 來先判斷日期是否正確.
*************************************/
function str2Date(str)
{
    if(dateValidate(str))
	{
	    var yyyy = str.substring(0, 4);
	    var mm = str.substring(4, 6)-1;
	    var dd = str.substring(6, 8);
		return new Date(yyyy, mm, dd);
	}
	else
	{
	    return false;
	}
}


/************* 日期轉字串 *************
 1.傳入的日期格式必須為 Date.
 2.產生的日期字串格式為 yyyymmdd.
*************************************/
function date2Str(date)
{
    var yyyy = date.getFullYear();
	var mm = date.getMonth()+1;
	if (mm < 10)
	    mm = "0"+mm;
	var dd = date.getDate();
	if (dd < 10)
	    dd = "0"+dd;
	return yyyy+""+mm+""+dd;
}


/************* 加減月份 *************
 1.必須搭配 dateValidate(), isLeap(), date2Str 來先判斷日期是否正確.
 2.日期字串格式必須為 yyyymmdd.
 3.產生的日期字串格式為 yyyymmdd.
*************************************/
function addMonth(baseDateStr, addedMonthNum)
{
    if(dateValidate(baseDateStr))
	{
	    var yyyy = baseDateStr.substring(0, 4);
	    var mm = baseDateStr.substring(4, 6)-1-(-addedMonthNum);
	    var dd = baseDateStr.substring(6, 8);
		var addedMonthDate = new Date(yyyy, mm, dd);
		return date2Str(addedMonthDate);
	}
	else
	{
	    return false;
	}
}



/************* 加減天數 *************
 1.必須搭配 dateValidate(), isLeap(), date2Str 來先判斷日期是否正確.
 2.日期字串格式必須為 yyyymmdd.
 3.產生的日期字串格式為 yyyymmdd.
*************************************/
function addDay(baseDateStr, addedDayNum)
{
    if(dateValidate(baseDateStr))
	{
	    var yyyy = baseDateStr.substring(0, 4);
	    var mm = baseDateStr.substring(4, 6)-1;
	    var dd = baseDateStr.substring(6, 8)-(-addedDayNum);
		var addedMonthDate = new Date(yyyy, mm, dd);
		return date2Str(addedMonthDate);
	}
	else
	{
	    return false;
	}
}


/************* 兩個日期的差距(也可當做檢查起迄日期) *************
 1.必須搭配 dateValidate(), isLeap(), str2Date 來先判斷日期是否正確.
 2.日期字串格式必須為 yyyymmdd.
 3.回傳的單位為"天"(dateStr2減dateStr1).
*************************************/
function daysDistance(dateStr1, dateStr2)
{
    if(dateValidate(dateStr1) && dateValidate(dateStr2))
	{
	    var date1 = Date.parse(str2Date(dateStr1));
		var date2 = Date.parse(str2Date(dateStr2));
		return Math.ceil((date2-date1)/(24*60*60*1000));
	}
	else
	{
	    return false;
	}
}


/************* 民國年的日期轉為西元年的日期(yyyymmdd) *************
 1.日期字串格式必須為 yymmdd, (yy為民國年).
 2.回傳的格式為yyyymmdd.
*************************************/
function twDate2Ad(dateStr)
{
    var yy = dateStr.substring(0, 2)-(-1911);
    var mm = dateStr.substring(2, 4);
    var dd = dateStr.substring(6);
	return yy+""+mm+""+dd;
}


/************* 西元年的日期(yyyymmdd)轉為民國年 *************
 1.日期字串格式必須為 yyyymmdd.
 2.回傳的格式為 yymmdd, (yy為民國年).
*************************************/
function ad2TwDate(dateStr)
{
    var yyyy = dateStr.substring(0, 4)-1911;
    var mm = dateStr.substring(4, 6);
    var dd = dateStr.substring(6);
	return yyyy+""+mm+""+dd;
}

/************* 日期區間檢查 *************
檢查兩個日期是否為有效區間
*************************************/
function isValidDateRange(date1, date2) {
	if (parseInt(date2.substring(0,4)) < parseInt(date1.substring(0,4))){
		alert(parseInt(date2.substring(0,4))+'<'+parseInt(date1.substring(0,4)));
		return false;
	}
	else if (parseInt(date2.substring(4,6)) < parseInt(date1.substring(4,6))) {
		alert(parseInt(date2.substring(4,6))+'<'+parseInt(date1.substring(4,6)));
		return false;
	}
	else if (parseInt(date2.substring(6,8)) < parseInt(date1.substring(6,8))) {
		alert(parseInt(date2.substring(6,8))+'<'+parseInt(date1.substring(6,8)));
		return false;
	}
	return true;
}


/********** Add by Brenda Hou for B2C Begin **********/

/**
 * 比對民國日期區間
 * @param openerObjS 起始日期物件
 * @param openerObjE 結束日期物件
 * @param fName      欄位名稱
 * @return
 * @author Brenda Hou 2011/08/19
 */
function checkDatePeriodByROC(openerObjS,openerObjE, fName){
    var sDate=openerObjS.value;
    if(sDate == "") return true;
    var sYear=sDate.substring(0, sDate.indexOf("/"));
    sYear = Math.abs(sYear) + 1911;
    sDate = sYear + sDate.substring(sDate.indexOf("/"));
    
    var eDate=openerObjE.value;
    if(eDate == "") return true;
    var eYear=eDate.substring(0, eDate.indexOf("/"));
    eYear = Math.abs(eYear) + 1911;
    eDate = eYear + eDate.substring(eDate.indexOf("/"));

    var startDate=new Date(sDate);
    var endDate=new Date(eDate);
//    alert(startDate.getFullYear() + " " + startDate.getMonth() + " " + startDate.getDate());
//    alert(endDate.getFullYear() + " " + endDate.getMonth() + " " + endDate.getDate());
    
    if(startDate > endDate){
        alert(fName + "(起)不得大於" + fName + "(迄)");
        openerObjS.focus();
        return false;
    }else{
        return true;
    }
    return true;
}

/**
 * 比對民國日期區間
 * @param openerObjS 起始日期物件
 * @param openerObjE 結束日期物件
 * @param msg        警告訊息
 * @return
 * @author Brenda Hou 2011/08/19
 */
function checkDatePeriodByROCMsg(openerObjS,openerObjE, msg){
    var sDate=openerObjS.value;
    if(sDate == "") return true;
    var sYear=sDate.substring(0, sDate.indexOf("/"));
    sYear = Math.abs(sYear) + 1911;
    sDate = sYear + sDate.substring(sDate.indexOf("/"));
    
    var eDate=openerObjE.value;
    if(eDate == "") return true;
    var eYear=eDate.substring(0, eDate.indexOf("/"));
    eYear = Math.abs(eYear) + 1911;
    eDate = eYear + eDate.substring(eDate.indexOf("/"));

    var startDate=new Date(sDate);
    var endDate=new Date(eDate);
//    alert(startDate.getFullYear() + " " + startDate.getMonth() + " " + startDate.getDate());
//    alert(endDate.getFullYear() + " " + endDate.getMonth() + " " + endDate.getDate());
    
    if(startDate > endDate){
        alert(msg);
        openerObjS.focus();
        return false;
    }else{
        return true;
    }
    return true;
}

/********** Add by 2295 for B2C日期區間上限檢核 End   **********/
function checkDateQueryIsValid(openerObjS,openerObjE, openerObjKey,msg){
    var sDate=openerObjS.value;
    if(sDate == "") return true;
    var sYear=sDate.substring(0, sDate.indexOf("/"));
    sYear = Math.abs(sYear) + 1911;
    sDate = sYear + sDate.substring(sDate.indexOf("/"));
    //alert("sDate="+sDate);
    var eDate=openerObjE.value;
    if(eDate == "") return true;
    var eYear=eDate.substring(0, eDate.indexOf("/"));
    eYear = Math.abs(eYear) + 1911;
    eDate = eYear + eDate.substring(eDate.indexOf("/"));
    //alert("eDate="+eDate);
    var startDate=new Date(sDate);
    var endDate=new Date(eDate);
    //alert("startDate="+startDate.getFullYear() + " " + startDate.getMonth() + " " + startDate.getDate());
    //alert("endDate="+endDate.getFullYear() + " " + endDate.getMonth() + " " + endDate.getDate());
    var key = openerObjKey.value;
    //alert("startDate.date2Str="+date2Str(startDate));
    //alert("key="+key);
    var afterMonth = addMonth(date2Str(startDate), key);
    //alert("alert.mm+"+key+"="+afterMonth);
    var yyyy = afterMonth.substring(0,4);
    var mm = afterMonth.substring(4,6);
    var dd = afterMonth.substring(6,8);
    var afterDate = new Date(yyyy+"/"+mm+"/"+dd);
    //alert("afterDate="+afterDate.getFullYear() + " " + afterDate.getMonth() + " " + afterDate.getDate());
    if(endDate > afterDate){
    	msg = msg.replace("{0}", key);
        alert(msg);
        openerObjS.focus();
        //alert(" endDate > afterDate");
        return false;
    }else{
    	//alert(" endDate <= afterDate");
        return true;
    }
}

/********** Add by 2295 for B2C日期區間上限檢核 End   **********/


//add by KT 日期格式為100/02/20
function checkDateRange(StartDate,EndDate, key,msg){
	var myStartDate = new Date(StartDate);
	var myEndDate = new Date(EndDate);
	// 天數，86400000是24*60*60*1000，除以86400000就是有幾天
	if ( (((myEndDate - myStartDate)/ 86400000)/(30*key)) > 1 ){
		alert(msg);
		return false;
	}else{
		return true;
	}
}