Javascript 以两种格式验证日期

如何验证mm dd yy和mm/dd/yy格式的日期，目前以下代码仅验证mm dd yy

function isValidDate(dateString) {
    if (!/^\d{2}\-\d{2}\-\d{2}$/.test(dateString)) {
        return false;
    }
    var parts = dateString.split("-");
    var day = parseInt(parts[1], 10);
    var month = parseInt(parts[0], 10);
    if (month == 0 || 12 < month) {
        return false;
    }
    var monthLength = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    return (0 < day && day <= monthLength[month - 1]);
}

将正则表达式更改为

function isValidDate(dateString) {
    // use - or / as the seprator
    if (!/^\d{2}([-\/])\d{2}\1\d{2}$/.test(dateString)) {
        return false;
    }

    //split using - or /
    var parts = dateString.split(/[-\/]/);
    var day = parseInt(parts[1], 10);
    var month = parseInt(parts[0], 10);
    if (month == 0 || 12 < month) {
        return false;
    }

    var monthLength = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
    return (0 < day && day <= monthLength[month - 1]);
}

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此模式将验证日期格式MM/dd/yy

private static final String DATE_PATTERN = 
          "((0?[1-9]|1[012])/0?[1-9]|[12][0-9]|3[01])/(\\d\\d))";

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java中的一个类似问题。闰年呢？