سلام من یه گانت چارت dhxgantt  دارم که بهش یه کد export  اضافه کردم ولی وقتی export  میکنم ماه و روز انگلیسی هستش, کدهم که برای export هست را قرار دادم...

 فقط اگه می دونید اگه کمکم کنید ممنون میشم.

(function () {

    var apiUrl = "https://export.dhtmlx.com/gantt";

    var templates = [
        "leftside_text",
        "rightside_text",
        "task_text",
        "progress_text",
        "task_class"
    ];

    function defaults(obj, std) {
        for (var key in std)
            if (!obj[key])
                obj[key] = std[key];
        return obj;
    }

    //compatibility for new versions of gantt
    if (!gantt.ajax) {
        if (window.dhtmlxAjax) {
            gantt.ajax = window.dhtmlxAjax;
        } else if (window.dhx4) {
            gantt.ajax = window.dhx4.ajax;
        }
    }

    function mark_columns(base) {
        var columns = base.config.columns;
        if (columns)
            for (var i = 0; i < columns.length; i++) {
                if (columns[i].template)
                    columns[i].$template = true;
            }
    }


    function add_export_methods(gantt) {
        var color_box = null;
        var color_hash = {};
        function get_styles(css) {
            if (!color_box) {
                var color_box = document.createElement("DIV");
                color_box.style.cssText = "position:absolute; display:none;";
                document.body.appendChild(color_box);
            }
            if (color_hash[css])
                return color_hash[css];

            color_box.className = css;
            return (color_hash[css] = get_color(color_box, "color") + ";" + get_color(color_box, "backgroundColor"));
        }
        gantt.exportToPDF = function (config) {
            if (config && config.raw) {
                config = defaults(config, {
                    name: "gantt.pdf", data: this._serialize_html()
                });
            } else {
                config = defaults((config || {}), {
                    name: "gantt.pdf",
                    header: "<h1 style=text-align:center>شرکت پارس سازان </h1>",

                    data: this._serialize_all(),
                    config: this.config,
                   
                });
                fix_columns(gantt, config.config.columns);
            }

            config.version = this.version;
            this._send_to_export(config, "pdf");
        };

        gantt.exportToPNG = function (config) {
            if (config && config.raw) {
                config = defaults(config, {
                    name: "gantt.png", data: this._serialize_html()
                });
            } else {
                config = defaults((config || {}), {
                    name: "gantt.png",
                    data: this._serialize_all(),
                    config: this.config
                });
                fix_columns(gantt, config.config.columns);
            }

            config.version = this.version;
            this._send_to_export(config, "png");
        };

        gantt.exportToICal = function (config) {
            config = defaults((config || {}), {
                name: "gantt.ical",
                data: this._serialize_plain().data,
                version: this.version
            });
            this._send_to_export(config, "ical");
        };



        function eachTaskTimed(start, end) {
            return function (code, parent, master) {
                parent = parent || this.config.root_id;
                master = master || this;

                var branch = this.getChildren(parent);
                if (branch)
                    for (var i = 0; i < branch.length; i++) {
                        var item = this._pull[branch[i]];
                        if ((!start || item.end_date > start) && (!end || item.start_date < end))
                            code.call(master, item);

                        if (this.hasChild(item.id))
                            this.eachTask(code, item.id, master);
                    }
            };
        }

        gantt.exportToExcel = function (config) {
            config = config || {};

            var tasks, dates;
            var state, scroll;
            if (config.start || config.end) {
                state = this.getState();
                dates = [this.config.start_date, this.config.end_date];
                scroll = this.getScrollState();
                var convert = this.date.str_to_date(this.config.api_date);
                tasks = this.eachTask;
              
                if (config.start)
                    this.config.start_date = convert(config.start);
                if (config.end)
                    this.config.end_date = convert(config.end);

                this.render();
                this.eachTask = eachTaskTimed(this.config.start_date, this.config.end_date);
            }

            this._no_progress_colors = config.visual === "base-colors";

            config = defaults(config, {
                name: "gantt.xlsx",
                title: "Tasks",
                data: this._serialize_table(config).data,
                columns: this._serialize_columns({ rawDates: true }),
                version: this.version
            });

            if (config.visual)
                config.scales = this._serialize_scales(config);

            this._send_to_export(config, "excel");

            if (config.start || config.end) {
                this.config.start_date = state.min_date;
                this.config.end_date = state.max_date;
                this.eachTask = tasks;

                this.render();
                this.scrollTo(scroll.x, scroll.y);

                this.config.start_date = dates[0];
                this.config.end_date = dates[1];
            }
        };

        gantt.exportToJSON = function (config) {
            config = defaults((config || {}), {
                name: "gantt.json",
                data: this._serialize_all(),
                config: this.config,
                columns: this._serialize_columns(),
                worktime: {
                    hours: this._working_time_helper.hours,
                    dates: this._working_time_helper.dates
                },
                version: this.version
            });
            this._send_to_export(config, "json");
        };

        gantt._msp_config = function (config) {

            if (config.project)
                for (var i in config.project) {
                    if (!config._custom_data)
                        config._custom_data = {};
                    config._custom_data[i] = config.project[i](this.config);
                }

            if (config.tasks)
                for (var j = 0; j < config.data.length; j++) {
                    var el = this.getTask(config.data[j].id);
                    if (!el._custom_data)
                        el._custom_data = {};
                    for (var i in config.tasks)
                        el._custom_data[i] = config.tasks[i](el, this.config);
                }

            delete config.project;
            delete config.tasks;

            config.time = {
                hours: gantt._working_time_helper.hours,
                dates: gantt._working_time_helper.dates
            };

            var p_dates = this.getSubtaskDates();
            var format = this.date.date_to_str("%d-%m-%Y %H:%i:%s");
            config.start_end = {
                start_date: format(p_dates.start_date),
                end_date: format(p_dates.end_date)
            };

        };

        gantt._msp_data = function () {
            var old_xml_format = this.templates.xml_format;
            this.templates.xml_format = this.date.date_to_str("%d-%m-%Y %H:%i:%s");

            var data = this._serialize_all();

            this.templates.xml_format = old_xml_format;
            return data;
        };

        gantt._ajax_to_export = function (data, type, callback) {
            delete data.callback;

            var url = data.server || apiUrl;

            gantt.ajax.post(url,
                "type=" + type + "&store=1&data=" + encodeURIComponent(JSON.stringify(data)),
                function (loader) {
                    var fail = loader.xmlDoc.status > 400;
                    var info = null;

                    if (!fail) {
                        try {
                            info = JSON.parse(loader.xmlDoc.responseText);
                        } catch (e) { }
                    }
                    callback(info);
                }
            );
        };

        gantt._send_to_export = function (data, type) {
            if (data.config)
                mark_columns(data, type);

            if (data.callback)
                return gantt._ajax_to_export(data, type, data.callback);

            var form = this._create_hidden_form();
            form.firstChild.action = data.server || apiUrl;
            form.firstChild.childNodes[0].value = JSON.stringify(data);
            form.firstChild.childNodes[1].value = type;
            form.firstChild.submit();
        };

        gantt._create_hidden_form = function () {
            if (!this._hidden_export_form) {
                var t = this._hidden_export_form = document.createElement("div");
                t.style.display = "none";
                t.innerHTML = "<form method='POST' target='_blank'><textarea name='data' style='width:0px; height:0px;' readonly='true'></textarea><input type='hidden' name='type' value=''></form>";
                document.body.appendChild(t);
            }
            return this._hidden_export_form;
        };

        //patch broken json serialization in gantt 2.1
        var original = gantt.json._copyObject;
        function copy_object_base(obj) {
            var copy = {};
            for (var key in obj) {
                if (key.charAt(0) == "$")
                    continue;
                copy[key] = obj[key];
            }
            copy.start_date = gantt.templates.xml_format(copy.start_date);
            if (copy.end_date)
                copy.end_date = gantt.templates.xml_format(copy.end_date);

            return copy;
        }

        function copy_object_plain(obj) {
            var text = gantt.templates.task_text(obj.start_date, obj.end_date, obj);

            var copy = copy_object_base(obj);
            copy.text = text || copy.text;

            return copy;
        }

        function get_color(node, style) {
            var value = node.currentStyle ? node.currentStyle[style] : getComputedStyle(node, null)[style];
            var rgb = value.replace(/\s/g, '').match(/^rgba?\((\d+),(\d+),(\d+)/i);
            return ((rgb && rgb.length === 4) ?
            ("0" + parseInt(rgb[1], 10).toString(16)).slice(-2) +
            ("0" + parseInt(rgb[2], 10).toString(16)).slice(-2) +
            ("0" + parseInt(rgb[3], 10).toString(16)).slice(-2) : value).replace("#", "");
        }

        function copy_object_table(obj) {
            var copy = copy_object_columns(obj, copy_object_plain(obj));
            if (copy.start_date)
                copy.start_date = obj.start_date.valueOf();
            if (copy.end_date)
                copy.end_date = obj.end_date.valueOf();

            copy.$start = gantt._day_index_by_date(obj.start_date);
            copy.$end = gantt._day_index_by_date(obj.end_date);
            copy.$level = obj.$level;
            copy.$type = obj.$rendered_type;

            var tmps = gantt.templates;
            copy.$text = tmps.task_text(obj.start, obj.end_date, obj);
            copy.$left = tmps.leftside_text ? tmps.leftside_text(obj.start, obj.end_date, obj) : "";
            copy.$right = tmps.rightside_text ? tmps.rightside_text(obj.start, obj.end_date, obj) : "";

            return copy;
        }

        function copy_object_colors(obj) {
            var copy = copy_object_table(obj);

            var node = gantt.getTaskNode(obj.id);
            if (node && node.firstChild) {
                var color = get_color((gantt._no_progress_colors ? node : node.firstChild), "backgroundColor");
                if (color == "363636")
                    color = get_color(node, "backgroundColor");

                copy.$color = color;
            } else if (obj.color)
                copy.$color = obj.color;

            return copy;
        }

        function copy_object_columns(obj, copy) {
            for (var i = 0; i < gantt.config.columns.length; i++) {
                var ct = gantt.config.columns[i].template;
                if (ct) {
                    var val = ct(obj);
                    if (val instanceof Date)
                        val = gantt.templates.date_grid(val, obj);
                    copy["_" + i] = val;
                }
            }
            return copy;
        }

        function copy_object_all(obj) {
            var copy = copy_object_base(obj);

            //serialize all text templates
            for (var i = 0; i < templates.length; i++) {
                var template = gantt.templates[templates[i]];
                if (template)
                    copy["$" + i] = template(obj.start_date, obj.end_date, obj);
            }

            copy_object_columns(obj, copy);
            copy.open = obj.$open;
            return copy;
        }

        function fix_columns(gantt, columns) {
            for (var i = 0; i < columns.length; i++) {
                columns[i].label = columns[i].label || gantt.locale.labels["column_" + columns[i].name];
                if (typeof columns[i].width == "string") columns[i].width = columns[i].width * 1;
            }
        }

        gantt._serialize_html = function () {
            return this.$container.parentNode.innerHTML;
        };

        gantt._serialize_all = function () {
            gantt.json._copyObject = copy_object_all;
            var data = export_serialize();
            gantt.json._copyObject = original;
            return data;
        };

        gantt._serialize_plain = function () {
            var config = gantt.templates.xml_format;
            gantt.templates.xml_format = gantt.date.date_to_str("%Y%m%dT%H%i%s", true);
            gantt.json._copyObject = copy_object_plain;

            var data = export_serialize();

            gantt.templates.xml_format = config;
            gantt.json._copyObject = original;

            delete data.links;
            return data;
        };

        gantt._serialize_table = function (config) {
            gantt.json._copyObject = config.visual ? copy_object_colors : copy_object_table;
            var data = export_serialize();
            gantt.json._copyObject = original;

            delete data.links;

            if (config.cellColors) {
                var css = this.templates.task_cell_class;
                if (css) {
                    var raw = this._scale_helpers.prepareConfigs(this._get_scales(), this.config.min_column_width, (this._get_resize_options().x ? Math.max(this.config.autosize_min_width, 0) : this.$task.offsetWidth), this.config.scale_height - 1);
                    var steps = raw[0].trace_x;
                    for (var i = 1; i < raw.length; i++)
                        if (raw[i].trace_x.length > steps.length)
                            steps = raw[i].trace_x;

                    for (var i = 0; i < data.data.length; i++) {
                        data.data[i].styles = [];
                        var task = this.getTask(data.data[i].id);
                        for (var j = 0; j < steps.length; j++) {
                            var date = steps[j];
                            var cell_css = css(task, date);
                            if (cell_css)
                                data.data[i].styles.push({ index: j, styles: get_styles(cell_css) });
                        }
                    }
                }
            }
            return data;
        };

        gantt._serialize_scales = function (config) {
            var scales = [];
            var raw = this._scale_helpers.prepareConfigs(this._get_scales(), this.config.min_column_width, (this._get_resize_options().x ? Math.max(this.config.autosize_min_width, 0) : this.$task.offsetWidth), this.config.scale_height - 1);

            var min = Infinity;
            var max = 0;
            for (var i = 0; i < raw.length; i++) min = Math.min(min, raw[i].col_width);

            for (var i = 0; i < raw.length; i++) {
                var start = 0;
                var end = 0;
                var row = [];

                scales.push(row);
                var step = raw[i];
                max = Math.max(max, step.trace_x.length);
                var template = step.template || (step.date ? gantt.date.date_to_str(step.date) : gantt.config.date_scale);

                for (var j = 0; j < step.trace_x.length; j++) {
                    var date = step.trace_x[j];
                    end = start + Math.round(step.width[j] / min);

                    var scale_cell = { text: template(date), start: start, end: end };

                    if (config.cellColors) {
                        var css = step.css || this.templates.scale_cell_class;
                        if (css) {
                            var scale_css = css(date);
                            if (scale_css)
                                scale_cell.styles = get_styles(scale_css);
                        }
                    }

                    row.push(scale_cell);
                    start = end;
                }
            }

            return { width: max, height: scales.length, data: scales };
        };

        gantt._serialize_columns = function (config) {
            gantt.exportMode = true;

            var columns = [];
            var cols = gantt.config.columns;

            var ccount = 0;
            for (var i = 0; i < cols.length; i++) {
                if (cols[i].name == "add" || cols[i].name == "buttons") continue;

                columns[ccount] = {
                    id: ((cols[i].template) ? ("_" + i) : cols[i].name),
                    header: cols[i].label || gantt.locale.labels["column_" + cols[i].name],
                    width: (cols[i].width ? Math.floor(cols[i].width / 4) : "")
                };

                if (cols[i].name == "duration")
                    columns[ccount].type = "number";
                if (cols[i].name == "start_date" || cols[i].name == "end_date") {
                    columns[ccount].type = "date";
                    if (config && config.rawDates)
                        columns[ccount].id = cols[i].name;
                }

                ccount++;
            }

            gantt.exportMode = false;
            return columns;
        };

        function export_serialize() {
            gantt.exportMode = true;
            var data = gantt.serialize();
            gantt.exportMode = false;
            return data;
        }
    }

    add_export_methods(gantt);
    if (window.Gantt && Gantt.plugin)
        Gantt.plugin(add_export_methods);

})();

(function () {
    var apiUrl = "https://export.dhtmlx.com/gantt";

    function set_level(data) {
        for (var i = 0; i < data.length; i++) {
            if (data[i].parent == 0) {
                data[i]._lvl = 1;
            }
            for (var j = i + 1; j < data.length; j++) {
                if (data[i].id == data[j].parent) {
                    data[j]._lvl = data[i]._lvl + 1;
                }
            }
        }
    }

    function clear_level(data) {
        for (var i = 0; i < data.length; i++) {
            delete data[i]._lvl
        }
    }

    function clear_rec_links(data) {
        set_level(data.data);
        var tasks = {};
        for (var i = 0; i < data.data.length; i++) {
            tasks[data.data[i].id] = data.data[i];
        }

        var links = {};
        for (i = 0; i < data.links.length; i++) {
            var link = data.links[i];
            if (gantt.isTaskExists(link.source) && gantt.isTaskExists(link.target)) {
                links[link.id] = link;
            }
        }

        for (i in links) {
            make_links_same_level(links[i], tasks);
        }

        var skippedLinks = {};
        for (i in tasks) {
            clear_circ_dependencies(tasks[i], links, tasks, {}, skippedLinks, null);
        }

        for (i in links) {
            clear_links_same_level(links, tasks);
        }

        for (i = 0; i < data.links.length; i++) {
            if (!links[data.links[i].id]) {
                data.links.splice(i, 1);
                i--;
            }
        }

        clear_level(data.data);
    }

    function clear_circ_dependencies(task, links, tasks, usedTasks, skippedLinks, prevLink) {
        var sources = task.$_source;
        if (!sources) return;

        if (usedTasks[task.id]) {
            on_circ_dependency_find(prevLink, links, usedTasks, skippedLinks);
        }

        usedTasks[task.id] = true;

        var targets = {};

        for (var i = 0; i < sources.length; i++) {
            if (skippedLinks[sources[i]]) continue;
            var curLink = links[sources[i]];
            var targetTask = tasks[curLink._target];
            if (targets[targetTask.id]) { // two link from one task to another
                on_circ_dependency_find(curLink, links, usedTasks, skippedLinks);
            }
            targets[targetTask.id] = true;
            clear_circ_dependencies(targetTask, links, tasks, usedTasks, skippedLinks, curLink);
        }
        usedTasks[task.id] = false;
    }

    function on_circ_dependency_find(link, links, usedTasks, skippedLinks) {
        if (link) {
            if (gantt.callEvent("onExportCircularDependency", [link.id, link])) {
                delete links[link.id];
            }

            delete usedTasks[link._source];
            delete usedTasks[link._target];
            skippedLinks[link.id] = true;
        }
    }

    function make_links_same_level(link, tasks) {
        var task,
			targetLvl,
			linkT = {
			    target: tasks[link.target],
			    source: tasks[link.source]
			};

        if (linkT.target._lvl != linkT.source._lvl) {
            if (linkT.target._lvl < linkT.source._lvl) {
                task = "source";
                targetLvl = linkT.target._lvl
            }
            else {
                task = "target";
                targetLvl = linkT.source._lvl;
            }

            do {
                var parent = tasks[linkT[task].parent];
                if (!parent) break;
                linkT[task] = parent;
            } while (linkT[task]._lvl < targetLvl);

            var sourceParent = tasks[linkT.source.parent],
				targetParent = tasks[linkT.target.parent];

            while (sourceParent && targetParent && sourceParent.id != targetParent.id) {
                linkT.source = sourceParent;
                linkT.target = targetParent;
                sourceParent = tasks[linkT.source.parent];
                targetParent = tasks[linkT.target.parent];
            }
        }

        link._target = linkT.target.id;
        link._source = linkT.source.id;

        if (!linkT.target.$_target)
            linkT.target.$_target = [];
        linkT.target.$_target.push(link.id);

        if (!linkT.source.$_source)
            linkT.source.$_source = [];
        linkT.source.$_source.push(link.id);
    }

    function clear_links_same_level(links, tasks) {
        for (var link in links) {
            delete links[link]._target;
            delete links[link]._source;
        }

        for (var task in tasks) {
            delete tasks[task].$_source;
            delete tasks[task].$_target;
        }
    }


    function customProjectProperties(data, config) {
        if (config && config.project) {
            for (var i in config.project) {
                if (!gantt.config.$custom_data)
                    gantt.config.$custom_data = {};
                gantt.config.$custom_data[i] = typeof config.project[i] == "function" ? config.project[i](gantt.config) : config.project[i];
            }
            delete config.project;
        }
    }

    function customTaskProperties(data, config) {
        if (config && config.tasks) {
            data.data.forEach(function (el) {
                for (var i in config.tasks) {
                    if (!el.$custom_data)
                        el.$custom_data = {};
                    el.$custom_data[i] = typeof config.tasks[i] == "function" ? config.tasks[i](el, gantt.config) : config.tasks[i];
                }
            });
            delete config.tasks;
        }
    }

    function exportConfig(data, config) {
        var p_name = config.name || 'gantt.xml';
        delete config.name;

        gantt.config.custom = config;
        var wTime = gantt._working_time_helper;
        var time;

        if (wTime.get_calendar) {
            time = wTime.get_calendar();
        } else {
            time = {
                hours: gantt._working_time_helper.hours,
                dates: gantt._working_time_helper.dates
            };
        }
        var p_dates = gantt.getSubtaskDates();
        if (p_dates.start_date && p_dates.end_date) {
            gantt.config.start_end = {
                start_date: gantt.templates.xml_format(p_dates.start_date),
                end_date: gantt.templates.xml_format(p_dates.end_date)
            };
        }

        var manual = config.auto_scheduling === undefined ? false : !!config.auto_scheduling;

        var res = {
            callback: config.callback || null,
            config: gantt.config,
            data: data,
            manual: manual,
            name: p_name,
            worktime: time
        };
        for (var i in config) res[i] = config[i];
        return res;
    }

    function add_export_methods(gantt) {
        gantt._ms_export = {};

        gantt.exportToMSProject = function (config) {
            config = config || {};
            config.skip_circular_links = config.skip_circular_links === undefined ? true : !!config.skip_circular_links;

            var old_xml_format = this.templates.xml_format;
            this.templates.xml_format = this.date.date_to_str("%d-%m-%Y %H:%i:%s");
            var data = this._serialize_all();

            customProjectProperties(data, config);

            customTaskProperties(data, config);

            if (config.skip_circular_links) {
                clear_rec_links(data);
            }

            config = exportConfig(data, config);

            this._send_to_export(config, "msproject");
            this.templates.xml_format = old_xml_format;
            this.config.$custom_data = null;
            this.config.custom = null;
        };


        function sendImportAjax(config) {
            var url = config.server || apiUrl;
            var store = config.store || 0;
            var formData = config.data;
            var callback = config.callback;

            var settings = {};
            if (config.durationUnit) settings.durationUnit = config.durationUnit
            if (config.projectProperties) settings.projectProperties = config.projectProperties;
            if (config.taskProperties) settings.taskProperties = config.taskProperties;

            formData.append("type", "msproject-parse");
            formData.append("data", JSON.stringify(settings));

            if (store)
                formData.append("store", store);

            var xhr = new XMLHttpRequest();
            xhr.onreadystatechange = function (e) {
                if (xhr.readyState == 4 && xhr.status == 0) {// network error
                    if (callback) {
                        callback(null);
                    }
                }
            };

            xhr.onload = function () {

                var fail = xhr.status > 400;
                var info = null;

                if (!fail) {
                    try {
                        info = JSON.parse(xhr.responseText);
                    } catch (e) { }
                }

                if (callback) {
                    callback(info);
                }

            };

            xhr.open('POST', url, true);
            xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
            xhr.send(formData);
        }

        gantt.importFromMSProject = function (config) {
            var formData = config.data;

            if (formData instanceof FormData) {

            } else if (formData instanceof File) {
                var data = new FormData();
                data.append("file", formData);
                config.data = data;
            }
            sendImportAjax(config);
        };
    }

    add_export_methods(gantt);
    if (window.Gantt && Gantt.plugin)
        Gantt.plugin(add_export_methods);

})();