diff --git a/www/calendar/export.js b/www/calendar/export.js
new file mode 100644
index 000000000..0d5921e73
--- /dev/null
+++ b/www/calendar/export.js
@@ -0,0 +1,121 @@
+// This file is used when a user tries to export the entire CryptDrive.
+// Calendars will be exported using this format instead of plain text.
+define([
+    '/customize/pages.js',
+], function (Pages) {
+    var module = {};
+
+    var getICSDate = function (str) {
+        var date = new Date(str);
+
+        var m = date.getUTCMonth() + 1;
+        var d = date.getUTCDate();
+        var h = date.getUTCHours();
+        var min = date.getUTCMinutes();
+
+        var year = date.getUTCFullYear().toString();
+        var month = m < 10 ? "0" + m : m.toString();
+        var day = d < 10 ? "0" + d : d.toString();
+        var hours = h < 10 ? "0" + h : h.toString();
+        var minutes = min < 10 ? "0" + min : min.toString();
+
+        return year + month + day + "T" + hours + minutes + "00Z";
+    }
+
+
+    var getDate = function (str, end) {
+        var date = new Date(str);
+        if (end) {
+            date.setDate(date.getDate() + 1);
+        }
+        var m = date.getUTCMonth() + 1;
+        var d = date.getUTCDate();
+
+        var year = date.getUTCFullYear().toString();
+        var month = m < 10 ? "0" + m : m.toString();
+        var day = d < 10 ? "0" + d : d.toString();
+
+        return year+month+day;
+    };
+
+    var MINUTE = 60;
+    var HOUR = MINUTE * 60;
+    var DAY = HOUR * 24;
+
+
+    module.main = function (userDoc) {
+        var content = userDoc.content;
+        var md = userDoc.metadata;
+
+        var ICS = [
+            'BEGIN:VCALENDAR',
+            'VERSION:2.0',
+            'PRODID:-//CryptPad//CryptPad Calendar '+Pages.versionString+'//EN',
+            'METHOD:PUBLISH',
+        ];
+
+        Object.keys(content).forEach(function (uid) {
+            var data = content[uid];
+            // DTSTAMP: now...
+            // UID: uid
+            var start, end;
+            if (data.isAllDay && data.startDay && data.endDay) {
+                start = "DTSTART;VALUE=DATE:" + getDate(data.startDay);
+                end = "DTEND;VALUE=DATE:" + getDate(data.endDay, true);
+            } else {
+                start = "DTSTART:"+getICSDate(data.start);
+                end = "DTEND:"+getICSDate(data.end);
+            }
+
+            Array.prototype.push.apply(ICS, [
+                'BEGIN:VEVENT',
+                'DTSTAMP:'+getICSDate(+new Date()),
+                'UID:'+uid,
+                start,
+                end,
+                'SUMMARY:'+ data.title,
+                'LOCATION:'+ data.location,
+            ]);
+
+            if (Array.isArray(data.reminders)) {
+                data.reminders.forEach(function (valueMin) {
+                    var time = valueMin * 60;
+                    var days = Math.floor(time / DAY);
+                    time -= days * DAY;
+                    var hours = Math.floor(time / HOUR);
+                    time -= hours * HOUR;
+                    var minutes = Math.floor(time / MINUTE);
+                    time -= minutes * MINUTE;
+                    var seconds = time;
+
+                    var str = "-P" + days + "D";
+                    if (hours || minutes || seconds) {
+                        str += "T" + hours + "H" + minutes + "M" + seconds + "S";
+                    }
+                    Array.prototype.push.apply(ICS, [
+                        'BEGIN:VALARM',
+                        'ACTION:DISPLAY',
+                        'DESCRIPTION:This is an event reminder',
+                        'TRIGGER:'+str,
+                        'END:VALARM'
+                    ]);
+                    // XXX ACTION:EMAIL
+                    // XXX ATTENDEE:mailto:xxx@xxx.xxx
+                    // XXX SUMMARY:Alarm notification
+                });
+            }
+
+            // XXX add hidden data (from imports)
+
+            ICS.push('END:VEVENT');
+        });
+
+        ICS.push('END:VCALENDAR');
+
+        return new Blob([ ICS.join('\n') ], { type: 'text/calendar;charset=utf-8' });
+    };
+
+    return module;
+});
+
+
diff --git a/www/calendar/inner.js b/www/calendar/inner.js
index f74f3cfaf..9986206f0 100644
--- a/www/calendar/inner.js
+++ b/www/calendar/inner.js
@@ -15,12 +15,14 @@ define([
     '/customize/messages.js',
     '/customize/application_config.js',
     '/lib/calendar/tui-calendar.min.js',
+    '/calendar/export.js',
 
     '/common/inner/share.js',
     '/common/inner/access.js',
     '/common/inner/properties.js',
 
     '/common/jscolor.js',
+    '/bower_components/file-saver/FileSaver.min.js',
     'css!/lib/calendar/tui-calendar.min.css',
     'css!/bower_components/components-font-awesome/css/font-awesome.min.css',
     'less!/calendar/app-calendar.less',
@@ -41,9 +43,11 @@ define([
     Messages,
     AppConfig,
     Calendar,
+    Export,
     Share, Access, Properties
     )
 {
+    var SaveAs = window.saveAs;
     var APP = window.APP = {
         calendars: {}
     };
@@ -453,6 +457,65 @@ Messages.calendar_allDay = "All day";
                     return true;
                 }
             });
+
+            if (!data.readOnly) {
+                options.push({
+                    tag: 'a',
+                    attributes: {
+                        'class': 'fa fa-upload',
+                    },
+                    content: h('span', Messages.importButton),
+                    action: function (e) {
+                        e.stopPropagation();
+                        return true;
+                    }
+                });
+            }
+            options.push({
+                tag: 'a',
+                attributes: {
+                    'class': 'fa fa-download',
+                },
+                content: h('span', Messages.exportButton),
+                action: function (e) {
+                    e.stopPropagation();
+                    var cal = APP.calendars[id];
+                    var suggestion = Util.find(cal, ['content', 'metadata', 'title']);
+                    var types = [];
+                    types.push({
+                        tag: 'a',
+                        attributes: {
+                            'data-value': '.ics',
+                            'href': '#'
+                        },
+                        content: '.ics'
+                    });
+                    var dropdownConfig = {
+                        text: '.ics', // Button initial text
+                        caretDown: true,
+                        options: types, // Entries displayed in the menu
+                        isSelect: true,
+                        initialValue: '.ics',
+                        common: common
+                    };
+                    var $select = UIElements.createDropdown(dropdownConfig);
+                    UI.prompt(Messages.exportPrompt,
+                        Util.fixFileName(suggestion), function (filename)
+                    {
+                        if (!(typeof(filename) === 'string' && filename)) { return; }
+                        var ext = $select.getValue();
+                        filename = filename + ext;
+                        var blob = Export.main(cal.content);
+                        SaveAs(blob, filename);
+                    }, {
+                        typeInput: $select[0]
+                    });
+                    return true;
+                }
+            });
+
+
+
             options.push({
                 tag: 'a',
                 attributes: {