html输入某天得到周几,JS计算某天后几天的日期/某天几个周后的周几日期

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获取本周、上一周和下一周周一至周日时间

function setWeekTime(weekTime){

var time=new Array();

if(weekTime=='last'){

time=getLastWeekDate();

}

if(weekTime=='this'){

time=getThisWeekDate();

}

if(weekTime=='next'){

time=getNextWeekDate();

}

document.getElementById("monday").value=time[0];

document.getElementById("tuesday").value=time[1];

document.getElementById("wednesday").value=time[2];

document.getElementById("thursday").value=time[3];

document.getElementById("friday").value=time[4];

document.getElementById("saturday").value=time[5];

document.getElementById("sunday").value=time[6];

}

//获得本周的周一和周末

function getThisWeekDate(){

var now = new Date();

var week=new Array();

var currentWeek = now.getDay();

if ( currentWeek == 0 ){

currentWeek = 7;

}

var monday = now.getTime() -(currentWeek-1)*24*60*60*1000; //星期一

var tuesday =now.getTime() - (currentWeek-2)*24*60*60*1000; //星期二

var wednesday = now.getTime() -(currentWeek-3)*24*60*60*1000; //星期三

var thursday = now.getTime() -(currentWeek-4)*24*60*60*1000; //星期四

var friday =now.getTime() - (currentWeek-5)*24*60*60*1000; //星期五

var saturday = now.getTime() -(currentWeek-6)*24*60*60*1000; //星期六

var sunday = now.getTime() +(7-currentWeek)*24*60*60*1000; //星期日

week=weektoday(monday,tuesday,wednesday,thursday,friday,saturday,sunday);

return week;

}

//获得上周的周一和周末

function getLastWeekDate(){

var now = new Date();

var week=new Array();

var currentWeek = now.getDay();

if ( currentWeek == 0 ){

currentWeek = 7;

}

var monday =now.getTime() - (currentWeek+6)*24*60*60*1000; //星期一

var tuesday =now.getTime() - (currentWeek+5)*24*60*60*1000; //星期二

var wednesday = now.getTime() -(currentWeek+4)*24*60*60*1000; //星期三

var thursday = now.getTime() -(currentWeek+3)*24*60*60*1000; //星期四

var friday =now.getTime() - (currentWeek+2)*24*60*60*1000; //星期五

var saturday = now.getTime() -(currentWeek+1)*24*60*60*1000; //星期六

var sunday =now.getTime() -(currentWeek)*24*60*60*1000; //星期日

week=weektoday(monday,tuesday,wednesday,thursday,friday,saturday,sunday);

return week;

}

//获得下周的周一至周末

function getNextWeekDate(){

var now = new Date();

var week=new Array();

var currentWeek = now.getDay();

if ( currentWeek == 0 ){

currentWeek = 7;

}

var monday = now.getTime() -(currentWeek-8)*24*60*60*1000; //星期一

var tuesday= now.getTime() -(currentWeek-9)*24*60*60*1000; //星期二

var wednesday = now.getTime() -(currentWeek-10)*24*60*60*1000; //星期三

var thursday = now.getTime() -(currentWeek-11)*24*60*60*1000; //星期四

var friday= now.getTime() -(currentWeek-12)*24*60*60*1000; //星期五

var saturday = now.getTime() -(currentWeek-13)*24*60*60*1000; //星期六

var sunday = now.getTime() -(currentWeek-14)*24*60*60*1000; //星期日

week=weektoday(monday,tuesday,wednesday,thursday,friday,saturday,sunday);

return week;

}

function weektoday(monday,tuesday,wednesday,thursday,friday,saturday,sunday){

var days=new Array();

var new_monday = changeTime(new Date(monday));//星期一

var new_tuesday= changeTime(new Date(tuesday)); //星期二

var new_wednesday = changeTime(new Date(wednesday)); //星期三

var new_thursday = changeTime(new Date(thursday)); //星期四

var new_friday= changeTime(new Date(friday)); //星期五

var new_saturday = changeTime(new Date(saturday));//星期六

var new_sunday = changeTime(new Date(sunday));//星期日

days[0]=new_monday;

days[1]=new_tuesday;

days[2]=new_wednesday;

days[3]=new_thursday;

days[4]=new_friday;

days[5]=new_saturday;

days[6]=new_sunday;

return days;

}

function changeTime(str){

var fullDate = "";

var tmpMonth = "";

var tmpDay = "";

var tmpYear = "";

tmpMonth = str.getMonth() + 1;

if(tmpMonth < 10){

tmpMonth = "0" + tmpMonth;

}

tmpDay = str.getDate();

if(tmpDay < 10){

tmpDay = "0" + tmpDay;

}

tmpYear = str.getFullYear();

return(tmpMonth+"/"+tmpDay+"/"+tmpYear);

}

function getDayOfWeek(){

var myDate = document.getElementById("mydate").value;

var temp = document.getElementById("tmp").value;

var tmpMonth = "";

var tmpDay = "";

var tmpYear = "";

tmpMonth = myDate.substring(0,2);

tmpday = myDate.substring(3,5);

tmpYear = myDate.substring(6,10);

var now = new Date(tmpYear,tmpMonth-1,tmpday);

var currentWeek = now.getDay();

if ( currentWeek == 0 ){

currentWeek = 7;

}

var weekDay;

temp = temp.toUpperCase();

if (temp.indexOf("M")==0) {

weekDay = 1;

} else if (temp.indexOf("T")==0) {

weekDay = 2;

} else if (temp.indexOf("M")==0) {

weekDay = 3;

} else if (temp.indexOf("H")==0) {

weekDay = 4;

} else if (temp.indexOf("F")==0) {

weekDay = 5;

} else if (temp.indexOf("S")==0) {

weekDay = 6;

} else if (temp.indexOf("U")==0) {

weekDay = 7;

}

var weeks = temp.substring(1);

var days = weeks * 7 + weekDay;

var weekday = now.getTime() -(currentWeek-days)*24*60*60*1000;

var formatDate = new Date(weekday);

document.getElementById("newdate").value=changeTime(formatDate);

}

function getNextDay(){

var strDate = document.getElementById("tmpdate").value;

var temp = document.getElementById("days").value;

if("" == strDate || "" == temp){

return "";

} else {

var tmpMonth = "";

var tmpDay = "";

var tmpYear = "";

tmpMonth = strDate.substring(0,2);

tmpday = strDate.substring(3,5);

tmpYear = strDate.substring(6,10);

var date = new Date(tmpYear,tmpMonth-1,tmpday);

//alert(date);

temp = new Number(temp);

date.setDate(date.getDate() + temp);

//alert(date);

tempStr = changeTime(date);

document.getElementById("newdate1").value=tempStr;

}

}

星期一		星期二		星期三
星期四		星期五		星期六
星期日

根据时间日期获下一个周几的时间 第一个框是输入日期； 第二个框输入: M (Mon) T (Tue) W (Wed) H (Thu) F (Fri) S (Sat) U (Sun) M1代表一周后的周一，M2两周后的周一

根据时间日期获取几天后的日期 第一个框是输入日期； 第二个框输入一个数字，表示几天后