javascript holiday validation

I want to validate the first field and show content in other. Check date and show description.

My script is working except when I introduce var Date

$(document).ready(function () {
    $('#holidayDate').datepicker();
    var availableTags = ["New years Day", "Martin Luther King Day", "Groundhog Day", "Valentine's Day", "Washington's Birthday",
        "Easter", "Earth Day", "National Arbor Day", "Mother's Day", "Memorial Day", "Flag Day", "Father's Day", "Independence Day",
        "Labor Day", "Columbus Day", "Halloween", "Veterans Day", "Thanksgiving Day", "Pearl Harbor Remembrance Day", "Christmas Day"
    ];
    $("#tags").autocomplete({
        source: availableTags
    });
    var Date = [Date().january().third().monday(), Date().february().third().monday()];
    $('#holidayDate').change(function () {
        var dateString = $(this).val().substring(0, 5);
        switch (dateString) {
        case '01/01':
            res = availableTags[0];
            break;
        case Date[0]:
            res = availableTags[1];
            break;
        case '02/02':
            res = availableTags[2];
            break;
        case '02/14':
            res = availableTags[3];
            break;
        case Date[1]:
            res = availableTags[4];
            break;
        case '04/22':
            res = availableTags[6];
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        case '06/14':
            res = availableTags[10];
            break;
        case '07/04':
            res = availableTags[12];
            break;
        case '10/31':
            res = availableTags[15];
            break;
        case '11/11':
            res = availableTags[16];
            break;
        case '12/07':
            res = availableTags[18];
            break;
        case '12/25':
            res = availableTags[19];
            break;
        }
        $('#tags').val(res);
    });
});

You are using a reserved word (Date).

Set it to something like

var myDate = [Date().january().third().monday(),Date().february().third().monday()];

You can't use the builtin Date object when you declare a variable called Date. Rename your variable to something else.