diff --git a/openslides/agenda/static/js/agenda/csv.js b/openslides/agenda/static/js/agenda/csv.js
index 3af602796..807c0dd67 100644
--- a/openslides/agenda/static/js/agenda/csv.js
+++ b/openslides/agenda/static/js/agenda/csv.js
@@ -5,16 +5,20 @@
 angular.module('OpenSlidesApp.agenda.csv', [])
 
 .factory('AgendaCsvExport', [
-    function () {
+    'HumanTimeConverter',
+    function (HumanTimeConverter) {
         return function (element, agenda) {
             var csvRows = [
                 ['title', 'text', 'duration', 'comment', 'is_hidden'],
             ];
             _.forEach(agenda, function (item) {
                 var row = [];
+                var duration = item.duration ? HumanTimeConverter.secondsToHumanTime(item.duration*60,
+                        { seconds: 'disabled',
+                            hours: 'enabled' }) : '';
                 row.push('"' + (item.title || '') + '"');
                 row.push('"' + (item.text || '') + '"');
-                row.push('"' + (item.duration || '') + '"');
+                row.push('"' + duration + '"');
                 row.push('"' + (item.comment || '') + '"');
                 row.push('"' + (item.is_hidden ? '1' : '')  + '"');
                 csvRows.push(row);
diff --git a/openslides/agenda/static/js/agenda/site.js b/openslides/agenda/static/js/agenda/site.js
index de8fd82f8..0421eabda 100644
--- a/openslides/agenda/static/js/agenda/site.js
+++ b/openslides/agenda/static/js/agenda/site.js
@@ -692,30 +692,6 @@ angular.module('OpenSlidesApp.agenda.site', [
     }
 ])
 
-.factory('AgendaCsvExport', [
-    function () {
-        return function (element, agenda) {
-            var csvRows = [
-                ['title', 'text', 'duration', 'comment', 'is_hidden'],
-            ];
-            _.forEach(agenda, function (item) {
-                var row = [];
-                row.push('"' + (item.title || '') + '"');
-                row.push('"' + (item.text || '') + '"');
-                row.push('"' + (item.duration || '') + '"');
-                row.push('"' + (item.comment || '') + '"');
-                row.push('"' + (item.is_hidden ? '1' : '')  + '"');
-                csvRows.push(row);
-            });
-
-            var csvString = csvRows.join("%0A");
-            element.href = 'data:text/csv;charset=utf-8,' + csvString;
-            element.download = 'agenda-export.csv';
-            element.target = '_blank';
-        };
-    }
-])
-
 //mark all agenda config strings for translation with Javascript
 .config([
     'gettext',
diff --git a/openslides/core/static/js/core/base.js b/openslides/core/static/js/core/base.js
index f45c22e02..a6b2ac8f5 100644
--- a/openslides/core/static/js/core/base.js
+++ b/openslides/core/static/js/core/base.js
@@ -852,48 +852,105 @@ angular.module('OpenSlidesApp.core', [
     }
 ])
 
+/* Two functions to convert between time duration in seconds <-> human readable time span.
+ * E.g. 90 sec <-> 1:30 (min), 3661 sec <-> 1:01:01 (h)
+ *
+ * secondsToHumanTime: Expects seconds and give [h*:]mm[:ss]. The minutes part is always given, the hours
+ *      and minutes could be controlled. The default are forced seconds and hours just if it is not 0.
+ *      - seconds ('enabled', 'auto', 'disabled'): Whether to show seconds (Default 'enabled')
+ *      - hours ('enabled', 'auto', 'disabled'): Whether to show hours (Default 'auto')
+ *
+ * humanTimeToSeconds: Expects [h*:]m*[:s*] with each part could have a variable length. The parsed time is
+ *      in seconds. Minutes have to be given and hours and seconds are optional. One have to set 'seconds' or
+ *      'hours' to true toparse these.
+ *
+ * params could be an object with the given settings, e.g. {ignoreHours: true}
+ */
+.factory('HumanTimeConverter', [
+    function () {
+        return {
+            secondsToHumanTime: function (seconds, params) {
+                if (!params) {
+                    params = {seconds: 'enabled', hours: 'auto'};
+                }
+                if (!params.seconds) {
+                    params.seconds = 'enabled';
+
+                }
+                if (!params.hours) {
+                    params.hours = 'auto';
+                }
+                var time;
+                // floor returns the largest integer of the absolut value of seconds
+                var total = Math.floor(Math.abs(seconds));
+                var h = Math.floor(total / 3600);
+                var m = Math.floor(total % 3600 / 60);
+                var s = Math.floor(total % 60);
+                // Add leading "0" for double digit values
+                time = ('0'+m).slice(-2); //minutes
+                if ((params.seconds == 'auto' && s > 0) || params.seconds == 'enabled') {
+                    s = ('0'+s).slice(-2);
+                    time =  time + ':' + s;
+                }
+                if ((params.hours == 'auto' && h > 0) || params.hours == 'enabled') {
+                    time = h + ':' + time;
+                }
+                if (seconds < 0) {
+                    time = '-'+time;
+                }
+                return time;
+            },
+            humanTimeToSeconds: function (data, params) {
+                if (!params) {
+                    params = {seconds: false, hours: false};
+                }
+                var minLength = 1;
+                if (params.seconds) {
+                    minLength++;
+                }
+                if (params.hours){
+                    minLength++;
+                }
+
+                var negative = data.charAt(0) == '-';
+                var time = data.split(':');
+                data = 0;
+                if (time.length >= minLength) {
+                    for (var i = 0; i < minLength; i++) {
+                        data = data*60 + (+time[i]);
+                    }
+                    if (!params.seconds) { // the last field was minutes (e.g. h:mm)
+                        data *= 60;
+                    }
+                    if (negative) {
+                        data = -data;
+                    }
+                }
+                return data;
+            },
+        };
+    }
+])
+
 /* Converts number of seconds into string "h:mm:ss" or "mm:ss" */
 .filter('osSecondsToTime', [
-    function () {
-        return function (totalseconds) {
-            var time;
-            // floor returns the largest integer of the absolut value of totalseconds
-            var total = Math.floor(Math.abs(totalseconds));
-            var h = Math.floor(total / 3600);
-            var mm = Math.floor(total % 3600 / 60);
-            var ss = Math.floor(total % 60);
-            var zero = "0";
-            // Add leading "0" for double digit values
-            mm = (zero+mm).slice(-2);
-            ss = (zero+ss).slice(-2);
-            if (h == "0")
-                time =  mm + ':' + ss;
-            else
-                time = h + ":" + mm + ":" + ss;
-            if (totalseconds < 0)
-                time = "-"+time;
-            return time;
+    'HumanTimeConverter',
+    function (HumanTimeConverter) {
+        return function (seconds) {
+            return HumanTimeConverter.secondsToHumanTime(seconds);
         };
     }
 ])
 
 /* Converts number of minutes into string "h:mm" or "hh:mm" */
 .filter('osMinutesToTime', [
-    function () {
-        return function (totalminutes) {
-            var time = '';
-            if (totalminutes) {
-                if (totalminutes < 0) {
-                    time = "-";
-                    totalminutes = -totalminutes;
-                }
-                var hh = Math.floor(totalminutes / 60);
-                var mm = Math.floor(totalminutes % 60);
-                // Add leading "0" for double digit values
-                mm = ("0" + mm).slice(-2);
-                time += hh + ":" + mm;
-            }
-            return time;
+    'HumanTimeConverter',
+    function (HumanTimeConverter) {
+        return function (minutes) {
+            return HumanTimeConverter.secondsToHumanTime(minutes*60,
+                { seconds: 'disabled',
+                    hours: 'enabled' }
+            );
         };
     }
 ])
diff --git a/openslides/core/static/js/core/site.js b/openslides/core/static/js/core/site.js
index ff8763ca3..e0b1a33a8 100644
--- a/openslides/core/static/js/core/site.js
+++ b/openslides/core/static/js/core/site.js
@@ -1338,40 +1338,19 @@ angular.module('OpenSlidesApp.core.site', [
 
 // format time string for model ("s") and view format ("h:mm:ss" or "mm:ss")
 .directive('minSecFormat', [
-    function () {
+    'HumanTimeConverter',
+    function (HumanTimeConverter) {
         return {
             require: 'ngModel',
             link: function(scope, element, attrs, ngModelController) {
                 ngModelController.$parsers.push(function(data) {
                     //convert data from view format (mm:ss) to model format (s)
-                    var time = data.split(':');
-                    if (time.length > 1) {
-                        data = (+time[0]) * 60 + (+time[1]);
-                        if (data < 0) {
-                            data = "-"+data;
-                        }
-                    }
-                    return data;
+                    return HumanTimeConverter.humanTimeToSeconds(data, {seconds: true});
                 });
 
                 ngModelController.$formatters.push(function(data) {
                     //convert data from model format (s) to view format (mm:ss)
-                    var time;
-                    // floor returns the largest integer of the absolut value of totalseconds
-                    var total = Math.floor(Math.abs(data));
-                    var mm = Math.floor(total / 60);
-                    var ss = Math.floor(total % 60);
-                    var zero = "0";
-                    // Add leading "0" for double digit values
-                    if (mm.length < 2) {
-                        mm = (zero+mm).slice(-2);
-                    }
-                    ss = (zero+ss).slice(-2);
-                    time =  mm + ':' + ss;
-                    if (data < 0) {
-                        time = "-"+time;
-                    }
-                    return time;
+                    return HumanTimeConverter.secondsToHumanTime(data);
                 });
             }
         };
@@ -1380,38 +1359,22 @@ angular.module('OpenSlidesApp.core.site', [
 
 // format time string for model ("m") and view format ("h:mm" or "hh:mm")
 .directive('hourMinFormat', [
-    function () {
+    'HumanTimeConverter',
+    function (HumanTimeConverter) {
         return {
             require: 'ngModel',
             link: function(scope, element, attrs, ngModelController) {
                 ngModelController.$parsers.push(function(data) {
                     //convert data from view format (hh:mm) to model format (m)
-                    var time = data.split(':');
-                    if (time.length > 1 && !isNaN(time[0]) && !isNaN(time[1])) {
-                        data = (+time[0]) * 60 + (+time[1]);
-                        if (data < 0) {
-                            data = "-"+data;
-                        }
-                    }
-                    if (data === '') {
-                        data = 0;
-                    }
-                    return data;
+                    return HumanTimeConverter.humanTimeToSeconds(data, {hours: true})/60;
                 });
 
-                ngModelController.$formatters.push(function(totalminutes) {
+                ngModelController.$formatters.push(function(data) {
                     //convert data from model format (m) to view format (hh:mm)
-                    var time = "";
-                    if (totalminutes < 0) {
-                        time = "-";
-                        totalminutes = -totalminutes;
-                    }
-                    var hh = Math.floor(totalminutes / 60);
-                    var mm = Math.floor(totalminutes % 60);
-                    // Add leading "0" for double digit values
-                    mm = ("0"+mm).slice(-2);
-                    time += hh + ":" + mm;
-                    return time;
+                    return HumanTimeConverter.secondsToHumanTime(data*60,
+                        { seconds: 'disabled',
+                            hours: 'enabled' }
+                    );
                 });
             }
         };
diff --git a/openslides/topics/static/js/topics/site.js b/openslides/topics/static/js/topics/site.js
index ba4621364..c04f27d88 100644
--- a/openslides/topics/static/js/topics/site.js
+++ b/openslides/topics/static/js/topics/site.js
@@ -271,7 +271,8 @@ angular.module('OpenSlidesApp.topics.site', ['OpenSlidesApp.topics'])
     'gettext',
     'Agenda',
     'Topic',
-    function($scope, gettext, Agenda, Topic) {
+    'HumanTimeConverter',
+    function($scope, gettext, Agenda, Topic, HumanTimeConverter) {
         // Big TODO: Change wording from "item" to "topic".
         // import from textarea
         $scope.importByLine = function () {
@@ -342,22 +343,13 @@ angular.module('OpenSlidesApp.topics.site', ['OpenSlidesApp.topics'])
                 }
                 // duration
                 if (item.duration) {
-                    var time = item.duration.replace(quotionRe, '$1').split(':'),
-                        len = time.length,
-                        data = '';
-                    if (len > 1 && !isNaN(time[len-2]) && !isNaN(time[len-1])) { // minutes and hours
-                        // e.g.: [sl:1000:]10:34 (the [] will not be parsed)
-                        data = (+time[len-2]) * 60 + (+time[len-1]);
-                    } else if (len == 1) { // just interpret minutes
-                        data = (+time[0]);
-                    } else {
-                        data = null;
-                    }
+                    var time = item.duration.replace(quotionRe, '$1');
+                    time = HumanTimeConverter.humanTimeToSeconds(time, {hours: true})/60;
 
-                    if (data < 0 || data === '') {
-                        data = null; // no negative duration
+                    if (time <= 0) { // null instead of 0 or negative duration
+                        time = null;
                     }
-                    item.duration = data;
+                    item.duration = time;
                 } else {
                     item.duration = null;
                 }