자바스크립트 날짜 계산 - 오늘, 어제, 내일, 전일, 전전일 등

/** 

날짜 

*/

function formatDate(date) {

    var mymonth = date.getMonth() + 1;

    var myweekday = date.getDate();

    return (date.getFullYear() + "-" + ((mymonth < 10) ? "0" : "") + mymonth + "-" + ((myweekday < 10) ? "0" : "") + myweekday);

}

function SetYesterday(begin, end) {

    var obj1 = document.getElementById(begin);

    var obj2 = document.getElementById(end);

    var mydate = new Date();

    mydate.setDate(mydate.getDate() - 1);

    obj1.value = formatDate(mydate);

    if (obj2 != null) {

        obj2.value = obj1.value;

    }

}

function SetWeek(begin, end) {

    var obj1 = document.getElementById(begin);

    var obj2 = document.getElementById(end);

    var now = new Date();

    var nowDayOfWeek = now.getDay();

    var nowDay = now.getDate();

    var nowMonth = now.getMonth();

    var nowYear = now.getYear();

    nowYear += (nowYear < 2000) ? 1900 : 0;

    var weekStartDate = new Date(nowYear, nowMonth, nowDay - nowDayOfWeek);

    var weekEndDate = new Date(nowYear, nowMonth, nowDay + (6 - nowDayOfWeek));

    obj1.value = formatDate(weekStartDate);

    obj2.value = formatDate(weekEndDate);

}

function Set7Days(begin, end) {

    var obj1 = document.getElementById(begin);

    var obj2 = document.getElementById(end);

    var mydate = new Date();

    mydate.setDate(mydate.getDate() - 7);

    obj1.value = formatDate(mydate);

    obj1.focus();

    obj2.value = formatDate(new Date());

    obj2.focus();

}

function Set30Days(begin, end) {

    var obj1 = document.getElementById(begin);

    var obj2 = document.getElementById(end);

    var mydate = new Date();

    mydate.setDate(mydate.getDate() - 30);

    obj1.value = formatDate(mydate);

    obj1.focus();

    obj2.value = formatDate(new Date());

    obj2.focus();

}

function Set90Days(begin, end) {

    var obj1 = document.getElementById(begin);

    var obj2 = document.getElementById(end);

    var mydate = new Date();

    mydate.setDate(mydate.getDate() - 90);

    obj1.value = formatDate(mydate);

    obj1.focus();

    obj2.value = formatDate(new Date());

    obj2.focus();

}

// 이번달

function SetCurrentMonthDays(begin, end) {

    var obj1 = document.getElementById(begin);

    var obj2 = document.getElementById(end);

    var d2, d22;

    d2 = new Date();

    d22 = new Date(d2.getYear(), d2.getMonth());

    

    var d3, d33;

    d3 = new Date();

    d33 = new Date(d3.getYear(), d3.getMonth() + 1, "");

    

    obj1.value = formatDate(d22);

    obj1.focus();

    obj2.value = formatDate(d33);

    obj2.focus();

}

// 이전달

function SetPrevMonthDays(begin, end) {

    var obj1 = document.getElementById(begin);

    var obj2 = document.getElementById(end);

    var d2, d22;

    d2 = new Date();

    d22 = new Date(d2.getYear(), d2.getMonth() -1);

    var d3, d33;

    d3 = new Date();

    d33 = new Date(d3.getYear(), d3.getMonth(), "");

    obj1.value = formatDate(d22);

    obj1.focus();

    obj2.value = formatDate(d33);

    obj2.focus();

}

<form>

<input type="text" name="BeginDate" /> ~ <input type="text" name="EndDate" />

</form>

<a alt="어제" onclick="SetYesterday('BeginDate', 'EndDate')">어제</a>

<a alt="이번주" onclick="SetWeek('BeginDate', 'EndDate')">이번주</a>

<a alt="최근7일" onclick="SetWeek('BeginDate', 'EndDate')">최근7일</a>

<a alt="지난달" onclick="SetPrevMonthDays('BeginDate', 'EndDate')">지난달</a>

<a alt="이번달" onclick="SetCurrentMonthDays('BeginDate', 'EndDate')">이번달</a>

<a alt="최근30일" onclick="Set30Days('BeginDate', 'EndDate')">최근30일</a>

<a alt="최근90일" onclick="Set90Days('BeginDate', 'EndDate')">최근90일</a>