function convert(input) {
    alert('Error.  Contact us if this keeps happening.');
    document.getElementById('modal-contact').classList.add('show');
    }







    function _dbPad(n) { return n < 10 ? '0' + n : String(n); }
    function _dbIsoToday() {
        var d = new Date();
        return d.getFullYear() + '-' + _dbPad(d.getMonth() + 1) + '-' + _dbPad(d.getDate());
    }
    function _dbParse(s) {
        if (!s) return null;
        var m = /^(\d{4})-(\d{2})-(\d{2})$/.exec(s);
        if (!m) return null;
        var y = +m[1], mo = +m[2] - 1, dd = +m[3];
        var d = new Date(Date.UTC(y, mo, dd));
        if (d.getUTCFullYear() !== y || d.getUTCMonth() !== mo || d.getUTCDate() !== dd) return null;
        return d;
    }
    function _dbDiffYearsMonthsDays(a, b) {
        var start = a < b ? a : b;
        var end = a < b ? b : a;
        var years = end.getUTCFullYear() - start.getUTCFullYear();
        var months = end.getUTCMonth() - start.getUTCMonth();
        var days = end.getUTCDate() - start.getUTCDate();
        if (days < 0) {
            months -= 1;
            var prevMonth = new Date(Date.UTC(end.getUTCFullYear(), end.getUTCMonth(), 0));
            days += prevMonth.getUTCDate();
        }
        if (months < 0) { years -= 1; months += 12; }
        return { years: years, months: months, days: days };
    }
    function _dbWeekdayName(d) {
        var names = ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
        return names[d.getUTCDay()];
    }
    function _dbFormatLongDate(d) {
        var months = ['January','February','March','April','May','June','July','August','September','October','November','December'];
        return months[d.getUTCMonth()] + ' ' + d.getUTCDate() + ', ' + d.getUTCFullYear();
    }

    function _dbCompute() {
        var modeAge = document.getElementById('db-mode-age') && document.getElementById('db-mode-age').checked;
        var from = _dbParse(document.getElementById('db-from').value);
        var to = _dbParse(document.getElementById('db-to').value);
        var out = document.getElementById('box2');
        if (!out) return;
        if (!from && !to) {
            out.value = '';
            return;
        }
        if (!from || !to) {
            out.value = 'Pick both dates above to see the result.';
            return;
        }

        var msPerDay = 24 * 60 * 60 * 1000;
        var earlier = from < to ? from : to;
        var later = from < to ? to : from;
        var totalDays = Math.round((later - earlier) / msPerDay);
        var weeks = Math.floor(totalDays / 7);
        var leftoverDays = totalDays - weeks * 7;
        var ymd = _dbDiffYearsMonthsDays(earlier, later);

        var lines = [];
        if (modeAge) {
            lines.push('Age on ' + _dbFormatLongDate(later) + ': ' + ymd.years + ' years, ' + ymd.months + ' months, ' + ymd.days + ' days');
            lines.push('');
            lines.push('Total days lived: ' + totalDays.toLocaleString());
            lines.push('Total weeks lived: ' + weeks.toLocaleString() + ' weeks and ' + leftoverDays + ' day' + (leftoverDays === 1 ? '' : 's'));
            lines.push('Total months: ' + (ymd.years * 12 + ymd.months).toLocaleString() + ' months and ' + ymd.days + ' day' + (ymd.days === 1 ? '' : 's'));
            lines.push('Born on ' + _dbWeekdayName(earlier) + ', ' + _dbFormatLongDate(earlier));
        } else {
            lines.push(_dbFormatLongDate(earlier) + ' (' + _dbWeekdayName(earlier) + ') to ' + _dbFormatLongDate(later) + ' (' + _dbWeekdayName(later) + ')');
            lines.push('');
            lines.push('Total: ' + totalDays.toLocaleString() + ' day' + (totalDays === 1 ? '' : 's'));
            lines.push('Weeks: ' + weeks.toLocaleString() + ' week' + (weeks === 1 ? '' : 's') + (leftoverDays ? ' and ' + leftoverDays + ' day' + (leftoverDays === 1 ? '' : 's') : ''));
            lines.push('Calendar: ' + ymd.years + ' year' + (ymd.years === 1 ? '' : 's') + ', ' + ymd.months + ' month' + (ymd.months === 1 ? '' : 's') + ', ' + ymd.days + ' day' + (ymd.days === 1 ? '' : 's'));
            lines.push('Months only: ' + (ymd.years * 12 + ymd.months).toLocaleString());
        }
        out.value = lines.join('\n');
    }

    function _dbApplyMode() {
        var modeAge = document.getElementById('db-mode-age') && document.getElementById('db-mode-age').checked;
        var fromLabel = document.getElementById('db-from-label');
        var toLabel = document.getElementById('db-to-label');
        if (fromLabel) fromLabel.textContent = modeAge ? 'Birth date' : 'From';
        if (toLabel) toLabel.textContent = modeAge ? 'As of' : 'To';
        _dbCompute();
    }

    function _dbInit() {
        var to = document.getElementById('db-to');
        if (to && !to.value) to.value = _dbIsoToday();
        var radios = document.querySelectorAll('input[name="db-mode"]');
        radios.forEach(function(r) { r.addEventListener('change', _dbApplyMode); });
        var from = document.getElementById('db-from');
        if (from) from.addEventListener('input', _dbCompute);
        if (to) to.addEventListener('input', _dbCompute);
        var todayBtn = document.getElementById('db-today');
        if (todayBtn) todayBtn.addEventListener('click', function() {
            var t = document.getElementById('db-to');
            if (t) { t.value = _dbIsoToday(); _dbCompute(); }
        });
        _dbApplyMode();
    }

    function convert(input) {
        return document.getElementById('box2') ? document.getElementById('box2').value : '';
    }

    document.addEventListener('DOMContentLoaded', _dbInit);
    if (document.readyState !== 'loading') _dbInit();



var _loadedScripts = {};
function loadScriptPromise(url) {
    if (_loadedScripts[url]) return _loadedScripts[url];
    _loadedScripts[url] = new Promise(function (resolve, reject) {
        var s = document.createElement('script');
        s.src = url;
        s.onload = resolve;
        s.onerror = reject;
        document.head.appendChild(s);
    });
    return _loadedScripts[url];
}

function replaceAll(find, replace, str) {
    return str.replace(new RegExp(find, 'g'), replace);
}

function beautify(str) {


    var result = '';

    var length = str.length;

    var i = 0;

    var braceCountLeft = 0;
    var braceCountRight = 0;

    var withinQuotes = false;

    while (i < length) {

        var c = str[i];

        if (c == '"' && (i == 0 || c[i - 1] != '\\')) {
            // non-escaped quotes
            withinQuotes = !withinQuotes;
        }

        if (!withinQuotes && (c == '}' || c == '{' || c == ',')) {

            console.log('Start####' + result);

            // look back and remove carriage returns and whitespace that are already there

            var resultIndex = result.length - 1;
            while (resultIndex >= 0 && (result[resultIndex] == ' ' || result[resultIndex] == '\r' || result[resultIndex] == '\n' || result[resultIndex] == '\t')) {

                resultIndex = resultIndex - 1;
                result = result.substr(0, resultIndex + 1);

                console.log('char ' + result[resultIndex] + '-----' + result + 'zzz ' + result.length + ' ' + resultIndex);

            }


            if (c == '{') {
                braceCountLeft++;
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            } else if (c == '}') {
                braceCountRight++;
                // precede with carriage return
                result += '\r' + GetTabs(braceCountLeft - braceCountRight) + c;
            } else if (c == ',') {
                result += c + '\r' + GetTabs(braceCountLeft - braceCountRight);
            }

            var nextChar = '';

            // advance through whitespace and remove carriage returns that are already there
            while (i < length && (str[i + 1] == ' ' || str[i + 1] == '\r' || str[i + 1] == '\n' || str[i + 1] == '\t')) {
                i++;
            }

        } else {

            result += str[i];

        }


        i++;

    }

    return result;

}

function GetTabs(count) {

    var result = '';

    for (var i = 0; i < count; i++) {
        result += '    ';
    }

    return result;

}