JS實現處理時間，年月日，星期的公共方法示例

Date.prototype.getWeek = function(){
 var firstDayOfYear = new Date(this.getFullYear(),0,1);
 var millOfDay = 24*60*60*1000;
 return Math.ceil((((this - firstDayOfYear) / millOfDay) + firstDayOfYear.getDay()+1)/7);
};
/*
01 October 2013-10:20:20
01 November 2013-10:20:20
01 December 2013-10:20:20
08 October 2013-01:55 pm
*/
var monthMapping = {
 "January" : "01",
 "February" : "02",
 "March" : "03",
 "April" : "04",
 "May" : "05",
 "June" : "06",
 "July" : "07",
 "August" : "08",
 "September" : "09",
 "October" : "10",
 "November" : "11",
 "December" : "12"
};
function formatAmPm() {
 var dateTimeStr = arguments[0] ; 
 var dateStr = dateTimeStr.split("-");
 if (lang.currentLang == "zh_CN" || lang.currentLang == "zh_TW"){
 var s_year = lang.getMessage('yearCn') ;
 var s_month = lang.getMessage('monthCn') ;
 var s_day = lang.getMessage('dayCn') ;
 var dateArray = dateStr[0].split(" ") ;
 var s_time = dateStr[1].split(" ")[1] == "am" ? lang.getMessage('amCn') :lang.getMessage('pmCn') ;
 var ret = dateArray[2] + s_year + monthMapping[dateArray[1]] + s_month + dateArray[0] + s_day + " " + s_time + dateStr[1].split(" ")[0] ; 
 if ( arguments.length > 1 ){
 /*admin feature ,so using en date*/
 ret = arguments[1] ? dateStr[0] : dateStr[1] ;
 }
 return ret ;
 } 
 else{
 if ( arguments.length > 1 ){
 return arguments[1] ? dateStr[0] : dateStr[1] ; 
 }
 else{
 return dateStr[0] + " " + dateStr[1] ;
 }
 } 
}
function formatDate(dateTime, pattern) {
 if(pattern == "" || pattern == null) {
 pattern = "/";
 }
 var date = new Date(dateTime);
 var year = date.getFullYear();
 var month = date.getMonth()+1;
 month = month <10 ? '0'+month : month;
 var day = date.getDate();
 day = day <10 ? '0'+day : day;
 return month + pattern + day + pattern + year;
}
function formatDateDDMMYYYY(dateTime) {
 var ymd = dateTime.split(" ")[0];
 var dateArray = ymd.split("-");
 return dateArray[2]+"."+dateArray[1]+"."+dateArray[0];
}
/**
* 
* @param dateTime YYYY-MM-DD hh:mm:ss
*/
function formatDateDDMMYY(dateTime){
 var ymd = dateTime.split(" ")[0];
 var dateArray = ymd.split("-");
 return dateArray[2]+"."+dateArray[1]+"."+dateArray[0].substring(2);
}
/**********************calculate date*****************************/
var MONTH = [
 {key:"Jan.",value:1},
 {key:"Feb.",value:2},
 {key:"Mar.",value:3},
 {key:"Apr.",value:4},
 {key:"May.",value:5},
 {key:"Jun.",value:6},
 {key:"Jul.",value:7},
 {key:"Aug.",value:8},
 {key:"Sept.",value:9},
 {key:"Oct.",value:10},
 {key:"Nov.",value:11},
 {key:"Dec.",value:12} 
 ];
var DAYS = [31,28,31,30,31,30,31,31,30,31,30,31];
function getYears(){
 var years = [];
 var date = new Date();
 var year = date.getFullYear();
 var minYear = year - 10; 
 for(var currentYear=minYear;currentYear <= year;currentYear++){
 years.push(currentYear);
 }
 return years;
};
function fillinMonthOptions(id,currentMonth){
 $("#" + id).get(0).options.length = 0;
 for(var i= 0;i<MONTH.length; i++){
 if (MONTH[i].value == currentMonth){
 $("#" + id).append("<option value="+MONTH[i].value+" selected=\"selected\">"+MONTH[i].key+"</option>");
 }
 else{
 $("#" + id).append("<option value="+MONTH[i].value+">"+MONTH[i].key+"</option>");
 }
 }
};
function fillinAllMonthOptions(monthIds,currentMonth){
 //var monthIds = ["loginMonth_1","loginMonth_2","auditMonth_1","auditMonth_2"];
 for (var i=0;i<monthIds.length;i++){
 fillinMonthOptions(monthIds[i],currentMonth);
 }; 
};
function fillinYearOptions(id,years,currentYear){
 $("#" + id).get(0).options.length = 0;
 for(var i= 0;i<years.length; i++){
 if (years[i] == currentYear){
 $("#" + id).append("<option value="+years[i]+" selected=\"selected\">"+years[i]+"</option>");
 }
 else{
 $("#" + id).append("<option value="+years[i]+">"+years[i]+"</option>");
 }
 }
};
function fillinAllYearOptions(yearIds,currentYear){
 //var yearIds = ["loginYear","auditYear"];
 years = getYears();
 for(var i= 0;i<yearIds.length; i++){
 fillinYearOptions(yearIds[i],years,currentYear);
 }
};
function isLeapYear(year){
 return (year % 4 === 0) && (year % 100 !==0) || (year % 400 === 0);
}
/*get days of a month*/
function getMonthDays(year,month){
 var monthDays = DAYS[month-1];
 if (isLeapYear(year) && month == 2){
 monthDays = 29;
 }
 return monthDays;
}
function fillinDay(id,monthDays){
 $("#" + id).get(0).options.length = 0;
 for(var i=1;i<=monthDays;i++){
 $("#" + id).append("<option value="+i+">"+i+"</option>");
 }
}
function fiilinDays(year,month,dayIds){
 var monthDays = getMonthDays(year,month);
 for(var i=0;i<dayIds.length;i++){
 fillinDay(dayIds[i],monthDays);
 }
}
function getWeeksOfYear(year){
 var firstDayOfYear = new Date(year,0,1);
 var days = firstDayOfYear.getDay() + (isLeapYear(year) ? 366 : 365);
 return Math.ceil(days/7);
}
function getCurrentWeekNo(){
 var currentDate = new Date();
 var firstDay = new Date(currentDate.getFullYear(),0,1);
 var dayms = 24 * 60 * 60 * 1000;
 var numday = ((currentDate - firstDay) / dayms );
 var weeks = Math.ceil((numday + firstDay.getDay() + 1) / 7);
 return weeks;
}
function getWeekRangeOfWeek(year,weekNo){
 var tmpDate = new Date("1/20/" + year);
 var numOfDaysPastSinceLastMonday = tmpDate.getDay()-1;
 tmpDate.setDate(tmpDate.getDate() - numOfDaysPastSinceLastMonday);
 var weekNoToday = tmpDate.getWeek();
 var weeksInFuture = weekNo - weekNoToday;
 tmpDate.setDate(tmpDate.getDate() + (7 * weeksInFuture) );
 var rangeFrom = tmpDate.getDate() + "/" + MONTH[tmpDate.getMonth()].key;
 tmpDate.setDate(tmpDate.getDate() + 6);
 var rangeTo = tmpDate.getDate() + "/" + MONTH[tmpDate.getMonth()].key ;
 return weekNo + "_#_" + rangeFrom + "_#_" + rangeTo ;
}
function fillinWeek(weekId,year){
 $("#" + weekId).get(0).options.length = 0;
 var weeksOfYear = getWeeksOfYear(year);
 var weeks = [];
 for(var i=0;i<weeksOfYear;i++){
 weeks.push(getWeekRangeOfWeek(year,i+1));
 }
 for(var j=0;j<weeks.length;j++){
 var week = weeks[j].split("_#_");
 $("#" + weekId).append("<option value="+week[0]+">"+week[0] + "(" + week[1]+"-"+week[2]+")</option>");
 }
}
function fillinWeeks(year,weekIds){
 for (var i=0;i<weekIds.length;i++){
 fillinWeek(weekIds[i],year);
 }
}