[JavaScript] 자동 하이픈 날짜

<script type = "text/javascript" >

    function DateCheck(obj, type) { // 날짜 체크

        if (obj.value != "") {
            var date = obj.value;
            var temp1 = type == 0 ? auto_hyphen_from(date) : auto_hyphen_to(date);
            obj.value = temp1;
        }
    }

function auto_hyphen_from(date) {

    var RegNotNum = /[^0-9]/g;
    var dataForm = "$1-$2-$3";
    var RegDate = /([0-9]{4})([0-9]{2})([0-9]+)/;
    var temp1 = date.replace(RegNotNum, "");

    if (temp1.length < 8) {
        var dateTime = new Date();
        var chkYear = dateTime.getFullYear();
        var chkMonth = dateTime.getMonth();
        var chkDate = dateTime.getDate();
        var newDate = chkYear + "-" + (chkMonth.toString().length < 2 ? ("0" + chkMonth) : chkMonth) + "-" + chkDate;
        return auto_hyphen_from(newDate);
    } else if (temp1.length > 8) {
        var date = temp1.substring(0, 8);
        return auto_hyphen_from(date);
    }

    while (RegDate.test(temp1)) {
        temp1 = temp1.replace(RegDate, dataForm);
    }

    if (isValidDate(temp1)) {
        return temp1;
    } else {
        var dateTime = new Date();
        var chkYear = dateTime.getFullYear();
        var chkMonth = dateTime.getMonth();
        var chkDate = dateTime.getDate();
        var newDate = chkYear + "-" + (chkMonth.toString().length < 2 ? ("0" + chkMonth) : chkMonth) + "-" + chkDate;

        return auto_hyphen_to(newDate);
    }

}

function auto_hyphen_to(date) {

    var RegNotNum = /[^0-9]/g;
    var dataForm = "$1-$2-$3";
    var RegDate = /([0-9]{4})([0-9]{2})([0-9]+)/;
    var temp1 = date.replace(RegNotNum, "");

    if (temp1.length < 8) {

        var dateTime = new Date();
        var chkYear = dateTime.getFullYear();
        var chkMonth = dateTime.getMonth() + 1;
        var chkDate = dateTime.getDate();
        var newDate = chkYear + "-" + (chkMonth.toString().length < 2 ? ("0" + chkMonth) : chkMonth) + "-" + chkDate;

        return auto_hyphen_to(newDate);

    } else if (temp1.length > 8) {

        var date = temp1.substring(0, 8);

        return auto_hyphen_to(date);

    }

    while (RegDate.test(temp1)) {

        temp1 = temp1.replace(RegDate, dataForm);

    }

    if (isValidDate(temp1)) {

        return temp1;

    } else {

        var dateTime = new Date();
        var chkYear = dateTime.getFullYear();
        var chkMonth = dateTime.getMonth() + 1;
        var chkDate = dateTime.getDate();
        var newDate = chkYear + "-" + (chkMonth.toString().length < 2 ? ("0" + chkMonth) : chkMonth) + "-" + chkDate;

        return auto_hyphen_to(newDate);

    }
}

function isValidDate(param) {

    try {

        param = param.replace(/-/g, '');

        // 자리수가 맞지않을때
        if (isNaN(param) || param.length != 8) {

            return false;

        }

        var year = Number(param.substring(0, 4));
        var month = Number(param.substring(4, 6));
        var day = Number(param.substring(6, 8));
        var dd = day / 0;

        if (month < 1 || month > 12) {

            return false;
        }

        var maxDaysInMonth = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
        var maxDay = maxDaysInMonth[month - 1];

        // 윤년 체크
        if (month == 2 && (year % 4 == 0 && year % 100 != 0 || year % 400 == 0)) {
            maxDay = 29;
        }

        if (day <= 0 || day > maxDay) {
            return false;
        }

        return true;

    } catch (err) {

        return false;

    }

}

<
/script>