js acquisition time (this week, this quarter, this month...)_javascript skills

Js code

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/**
* Get the start date and stop date of this week, this quarter, this month, and last month
*/
var now = new Date(); //Current date
var nowDayOfWeek = now.getDay(); //Today’s day of the week
var nowDay = now.getDate(); //Current day
var nowMonth = now.getMonth(); //Current month
var nowYear = now.getYear(); //Current year
nowYear = (nowYear < 2000) ? 1900 : 0; //

var lastMonthDate = new Date(); //Last month’s date
lastMonthDate.setDate(1);
lastMonthDate.setMonth(lastMonthDate.getMonth()-1);
var lastYear = lastMonthDate.getYear();
var lastMonth = lastMonthDate.getMonth();

//Format date: yyyy-MM-dd
function formatDate(date) {
var myyear = date.getFullYear();
var mymonth = date.getMonth() 1;
var myweekday = date.getDate();

if(mymonth < 10){
mymonth = "0" mymonth;
}
if(myweekday < 10){
myweekday = "0" myweekday;
}
return (myyear "-" mymonth "-" myweekday) ;
}

//Get the number of days in a month
function getMonthDays(myMonth){
var monthStartDate = new Date(nowYear, myMonth, 1);
var monthEndDate = new Date(nowYear, myMonth 1, 1);
var days = (monthEndDate - monthStartDate)/(1000 * 60 * 60 * 24);
return days;
}

// Get the starting month of this quarter
function getQuarterStartMonth(){
var quarterStartMonth = 0;
if(nowMonth<3){
quarterStartMonth = 0;
}
if(2< nowMonth && nowMonth<6){
quarterStartMonth = 3;
}
if(5quarterStartMonth = 6;
}
if(nowMonth> 8){
quarterStartMonth = 9;
}
return quarterStartMonth;
}

//Get the start date of the week
function getWeekStartDate() {
var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);
return formatDate(weekStartDate);
}

//Get the stop date of this week
function getWeekEndDate() {
var weekEndDate = new Date(nowYear, nowMonth, nowDay (6 - nowDayOfWeek));
return formatDate(weekEndDate);
}

//Get the starting date of this month
function getMonthStartDate(){
var monthStartDate = new Date(nowYear, nowMonth, 1);
return formatDate(monthStartDate);
}

//Get the stop date of this month
function getMonthEndDate(){
var monthEndDate = new Date(nowYear, nowMonth, getMonthDays(nowMonth));
return formatDate(monthEndDate);
}

//Get the beginning of the previous month When
function getLastMonthStartDate(){
var lastMonthStartDate = new Date(nowYear, lastMonth, 1);
return formatDate(lastMonthStartDate);
}

//Get the last month stop When
function getLastMonthEndDate(){
var lastMonthEndDate = new Date(nowYear, lastMonth, getMonthDays(lastMonth));
return formatDate(lastMonthEndDate);
}

//get The start date of this quarter
function getQuarterStartDate(){

var quarterStartDate = new Date(nowYear, getQuarterStartMonth(), 1);
return formatDate(quarterStartDate);
}

//Or the stop date of this quarter
function getQuarterEndDate(){
var quarterEndMonth = getQuarterStartMonth() 2;
var quarterStartDate = new Date(nowYear, quarterEndMonth, getMonthDays(quarterEndMonth));
return formatDate(quarterStartDate);
}