date.js

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define(function (require) {

    var elgg = require('elgg');
    var $ = require('jquery');
    require('jquery-ui');

    // the language module may need loading
    var i18n_ready = $.Deferred();
    if (elgg.get_language() === 'en') {
        i18n_ready.resolve();
    } else {
        require(['jquery-ui/i18n/datepicker-' + elgg.get_language() + '.min'], function () {
            i18n_ready.resolve();
        }, function () {
            // if load fails (e.g. lang code mismatch), carry on with English
            i18n_ready.resolve();
        });
    }

    var datepicker = {
        init: function (selector) {
            if (!$(selector).length) {
                return;
            }
            var defaults = {
                dateFormat: 'yy-mm-dd',
                nextText: '»',
                prevText: '«',
                changeMonth: true,
                changeYear: true
            };

            $(selector).each(function () {
                var $elem = $(this);
                var opts = $elem.data('datepickerOpts') || {};
                opts = $.extend({}, defaults, opts);

                opts.onSelect = function (dateText, instance) {
                    if ($(this).is('.elgg-input-timestamp')) {
                        timestamp = '';
                        if (dateText.length) {
                            // convert to unix timestamp
                            var timestamp = Date.UTC(instance.selectedYear, instance.selectedMonth, instance.selectedDay);
                            timestamp = timestamp / 1000;
                        }
                        $('input[rel="' + this.id + '"]').val(timestamp);
                    }
                };

                // defer until language loaded
                i18n_ready.then(function () {
                    $elem.datepicker(opts);
                    $elem.on('keyup', function(event) {
                        switch (event.keyCode) {
                            case $.ui.keyCode.DELETE:
                            case $.ui.keyCode.BACKSPACE:
                                $.datepicker._clearDate(event.target);
                                break;
                        }
                    });
                });
            });
        }
    };

    return datepicker;
});