JS实现处理时间，年月日，星期的公共方法示例

本文实例讲述了js实现处理时间，年月日，星期的公共方法。分享给大家供大家参考，具体如下：

在项目中用到的，用js 来得到年月日，星期，当前多少个周的函数，备忘在这里，以后参考。

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);
  }
}

ps：这里再为大家推荐几款比较实用的天数计算在线工具供大家使用：

在线日期/天数计算器：

在线日期计算器/相差天数计算器：

在线日期天数差计算器：

在线天数计算器：

更多关于javascript相关内容感兴趣的读者可查看本站专题：《javascript时间与日期操作技巧总结》、《javascript+html5特效与技巧汇总》、《javascript错误与调试技巧总结》、《javascript数据结构与算法技巧总结》及《javascript数学运算用法总结》

希望本文所述对大家javascript程序设计有所帮助。