//該方法有兩個參數，date是給定的日期型參數，days是需要在該日期進行加減的天數。 
//例如，add(2010-10-01,-3)返回從2010-10-01這一天往前退3天的日期即2010-09-28 
function addDate(date,days){ 
var d=new Date(date); 
d.setDate(d.getDate()+days); 
var m=d.getMonth()+1; 
var tmpDate = d.getFullYear()+ "/" + m + "/" + d.getDate(); 
var resultDate = new Date(tmpDate); 
return resultDate; 
} 
//對選擇的年月轉換為YYYY-MM-dd的格式 
function changeDateFormat(DateIn){ 
var year = 0; 
var month = 0; 
var Day = 0; 
var currentDate = ""; 
year = DateIn.getYear(); 
month = DateIn.getMonth() + 1; 
Day = DateIn.getDate(); 
currentDate = year + "-"; 
if(month > 10){ 
currentDate = currentDate + month + "-"; 
}else{ 
currentDate = currentDate + "0" + month + "-"; 
} 
if(Day > 10){ 
currentDate = currentDate + Day; 
}else{ 
currentDate = currentDate + "0" + Day; 
} 
return currentDate; 
} 
//根據選擇的周計算出本周的開始日和結束日 
function weekToDate(weekNumber,strWeekDay,dateIn){ 
//輸出的開始日 var outputDate_1 = ""; 
//輸出的結束日 var outputDate_2 = ""; 
var tmp_date= ""; 
//如果選擇的年月1號這一天恰好為sunday，該周monday的日期為這一天的日期-6 
if(strWeekDay == '0'){ 
outputDate_1 = addDate(dateIn,-6); 
} 
//如果選擇的年月1號這一天為monday,第二個參數設為0，以下以此類推。 
if(strWeekDay == '1'){ 
outputDate_1 = addDate(dateIn,0); 
} 
if(strWeekDay == '2'){ 
outputDate_1 = addDate(dateIn,-1); 
} 
if(strWeekDay == '3'){ 
outputDate_1 = addDate(dateIn,-2); 
} 
if(strWeekDay == '4'){ 
outputDate_1 = addDate(dateIn,-3); 
} 
if(strWeekDay == '5'){ 
outputDate_1 = addDate(dateIn,-4); 
} 
if(strWeekDay == '6'){ 
outputDate_1 = addDate(dateIn,-5); 
} 
if(weekNumber == '1'){ 
outputDate_2 = dateIn; 
} 
if(weekNumber == '2'){ 
outputDate_2 = addDate(outputDate_1,+7); 
} 
if(weekNumber == '3'){ 
outputDate_2 = addDate(outputDate_1,+14); 
} 
if(weekNumber == '4'){ 
outputDate_2 = addDate(outputDate_1,+21); 
} 
if(weekNumber == '5'){ 
outputDate_2 = addDate(outputDate_1,+28); 
} 
if(weekNumber == '1'){ 
//第1周的開始日結束日計算基點都是outputDate_1,因此單獨判斷 
document.getElementById("spnDate").value = changeDateFormat(outputDate_1); 
temp_date = addDate(outputDate_1,+6); 
document.getElementById("finishTime").value =changeDateFormat(temp_date); 
}else{ 
//第2周以后的開始日結束日都以outputDate_2為計算基點 
document.getElementById("spnDate").value = changeDateFormat(outputDate_2); 
temp_date = addDate(outputDate_2,+6); 
document.getElementById("finishTime").value =changeDateFormat(temp_date); 
} 
} 
function getFromToDateOfSelectedWeek(){ 
var year = document.getElementById("sltYear"); 
var optionYear=year.getElementsByTagName("option"); 
var strYear = "" ; 
for(var i=0;i<optionYear.length;++i) 
{ 
if(optionYear[i].selected){ 
strYear = optionYear[i].text; 
} 
} 
var month = document.getElementById("sltMonth"); 
var option = month.getElementsByTagName("option"); 
var strMonth = "" ; 
for(var i=0;i<option.length;++i) 
{ 
if(option[i].selected){ 
strMonth = option[i].text; 
} 
} 
//根據選擇的年月，組合成yyyy/mm/01的日期字符串 
var sltDate_tmp_0 = strYear+ "/" + strMonth + "/" + "1"; 
//將日期字符串轉換為日期型 
var sltDate_tmp_1 = new Date(sltDate_tmp_0); 
//取得該月1號所在的星期數 
var weekDay = sltDate_tmp_1.getDay(); 
//獲取頁面選擇的周數 
var weekNumber = document.getElementById("weekNumber"); 
var optionWeek=weekNumber.getElementsByTagName("option"); 
var strWeek = "" ; 
var tmp_date= ""; 
var outputDate_1 = ""; 
var outputDate_2 = ""; 
for(var i=0;i<optionWeek.length;++i) 
{ 
if(optionWeek[i].selected){ 
strWeek = optionWeek[i].text; 
} 
} 
//選擇第1周時計算該年月1號這一天為monday到sunday各種可能性，返回該周monday到sunday的日期 
//以下判斷以此類推 
if(strWeek == '1'){ 
if(weekDay == '0'){ 
weekToDate(strWeek,'0',sltDate_tmp_1); 
} 
if(weekDay == '1'){ 
weekToDate(strWeek,'1',sltDate_tmp_1); 
} 
if(weekDay == '2'){ 
weekToDate(strWeek,'2',sltDate_tmp_1); 
} 
if(weekDay == '3'){ 
weekToDate(strWeek,'3',sltDate_tmp_1); 
} 
if(weekDay == '4'){ 
weekToDate(strWeek,'4',sltDate_tmp_1); 
} 
if(weekDay == '5'){ 
weekToDate(strWeek,'5',sltDate_tmp_1); 
} 
if(weekDay == '6'){ 
weekToDate(strWeek,'6',sltDate_tmp_1); 
} 
} 
if(strWeek == '2'){ 
if(weekDay == '0'){ 
weekToDate(strWeek,'0',sltDate_tmp_1); 
} 
if(weekDay == '1'){ 
weekToDate(strWeek,'1',sltDate_tmp_1); 
} 
if(weekDay == '2'){ 
weekToDate(strWeek,'2',sltDate_tmp_1); 
} 
if(weekDay == '3'){ 
weekToDate(strWeek,'3',sltDate_tmp_1); 
} 
if(weekDay == '4'){ 
weekToDate(strWeek,'4',sltDate_tmp_1); 
} 
if(weekDay == '5'){ 
weekToDate(strWeek,'5',sltDate_tmp_1); 
} 
if(weekDay == '6'){ 
weekToDate(strWeek,'6',sltDate_tmp_1); 
} 
} 
if(strWeek == '3'){ 
if(weekDay == '0'){ 
weekToDate(strWeek,'0',sltDate_tmp_1); 
} 
if(weekDay == '1'){ 
weekToDate(strWeek,'1',sltDate_tmp_1); 
} 
if(weekDay == '2'){ 
weekToDate(strWeek,'2',sltDate_tmp_1); 
} 
if(weekDay == '3'){ 
weekToDate(strWeek,'3',sltDate_tmp_1); 
} 
if(weekDay == '4'){ 
weekToDate(strWeek,'4',sltDate_tmp_1); 
} 
if(weekDay == '5'){ 
weekToDate(strWeek,'5',sltDate_tmp_1); 
} 
if(weekDay == '6'){ 
weekToDate(strWeek,'6',sltDate_tmp_1); 
} 
} 
if(strWeek == '4'){ 
if(weekDay == '0'){ 
weekToDate(strWeek,'0',sltDate_tmp_1); 
} 
if(weekDay == '1'){ 
weekToDate(strWeek,'1',sltDate_tmp_1); 
} 
if(weekDay == '2'){ 
weekToDate(strWeek,'2',sltDate_tmp_1); 
} 
if(weekDay == '3'){ 
weekToDate(strWeek,'3',sltDate_tmp_1); 
} 
if(weekDay == '4'){ 
weekToDate(strWeek,'4',sltDate_tmp_1); 
} 
if(weekDay == '5'){ 
weekToDate(strWeek,'5',sltDate_tmp_1); 
} 
if(weekDay == '6'){ 
weekToDate(strWeek,'6',sltDate_tmp_1); 
} 
} 
if(strWeek == '5'){ 
if(weekDay == '0'){ 
weekToDate(strWeek,'0',sltDate_tmp_1); 
} 
if(weekDay == '1'){ 
weekToDate(strWeek,'1',sltDate_tmp_1); 
} 
if(weekDay == '2'){ 
weekToDate(strWeek,'2',sltDate_tmp_1); 
} 
if(weekDay == '3'){ 
weekToDate(strWeek,'3',sltDate_tmp_1); 
} 
if(weekDay == '4'){ 
weekToDate(strWeek,'4',sltDate_tmp_1); 
} 
if(weekDay == '5'){ 
weekToDate(strWeek,'5',sltDate_tmp_1); 
} 
if(weekDay == '6'){ 
weekToDate(strWeek,'6',sltDate_tmp_1); 
} 
} 
}