diff --git a/calendar/js/app.js b/calendar/js/app.js
index 0d5ba62a55..18753b986e 100644
--- a/calendar/js/app.js
+++ b/calendar/js/app.js
@@ -2454,7 +2454,7 @@ app.classes.calendar = AppJS.extend(
 			var range = '';
 
 			var datefmt = egw.preference('dateformat');
-			var timefmt = egw.preference('timeformat') == 12 ? 'h:i a' : 'H:i';
+			var timefmt = egw.preference('timeformat') === '12' ? 'h:i a' : 'H:i';
 
 			var month_before_day = datefmt[0].toLowerCase() == 'm' ||
 				datefmt[2].toLowerCase() == 'm' && datefmt[4] == 'd';
diff --git a/calendar/js/et2_widget_event.js b/calendar/js/et2_widget_event.js
index 31cf60ccb6..f440400153 100644
--- a/calendar/js/et2_widget_event.js
+++ b/calendar/js/et2_widget_event.js
@@ -433,7 +433,7 @@ var et2_calendar_event = et2_valueWidget.extend([et2_IDetachedDOM],
 			if (event['end_m'] > 24*60)
 			{
 				timespan = jQuery.datepicker.formatTime(
-					egw.preference("timeformat") === 12 ? "h:mmtt" : "HH:mm",
+					egw.preference("timeformat") === "12" ? "h:mmtt" : "HH:mm",
 					{
 						hour: event.start_m / 60,
 						minute: event.start_m % 60,
@@ -442,7 +442,7 @@ var et2_calendar_event = et2_valueWidget.extend([et2_IDetachedDOM],
 					},
 					{"ampm": (egw.preference("timeformat") === "12")}
 				).trim()+' - '+jQuery.datepicker.formatTime(
-					egw.preference("timeformat") === 12 ? "h:mmtt" : "HH:mm",
+					egw.preference("timeformat") === "12" ? "h:mmtt" : "HH:mm",
 					{
 						hour: event.end_m / 60,
 						minute: event.end_m % 60,
@@ -464,7 +464,7 @@ var et2_calendar_event = et2_valueWidget.extend([et2_IDetachedDOM],
 			duration = Math.floor(duration/60) + this.egw().lang('h')+(duration%60 ? duration%60 : '');
 
 			timespan = jQuery.datepicker.formatTime(
-				egw.preference("timeformat") === 12 ? "h:mmtt" : "HH:mm",
+				egw.preference("timeformat") === "12" ? "h:mmtt" : "HH:mm",
 				{
 					hour: event.start_m / 60,
 					minute: event.start_m % 60,
diff --git a/calendar/js/et2_widget_planner.js b/calendar/js/et2_widget_planner.js
index 17c9ca9a0b..391560a65d 100644
--- a/calendar/js/et2_widget_planner.js
+++ b/calendar/js/et2_widget_planner.js
@@ -1414,14 +1414,14 @@ var et2_calendar_planner = et2_valueWidget.extend([et2_IDetachedDOM, et2_IResize
 		var time = this._get_time_from_position(position.left, position.top);
 		element.dropEnd = time;
 		var formatted_time = jQuery.datepicker.formatTime(
-			egw.preference("timeformat") == 12 ? "h:mmtt" : "HH:mm",
+			egw.preference("timeformat") === "12" ? "h:mmtt" : "HH:mm",
 			{
 				hour: time.getUTCHours(),
 				minute: time.getUTCMinutes(),
 				seconds: 0,
 				timezone: 0
 			},
-			{"ampm": (egw.preference("timeformat") == "12")}
+			{"ampm": (egw.preference("timeformat") === "12")}
 		);
 
 		element.innerHTML = '<div class="calendar_d-n-d_timeCounter"><span class="calendar_timeDemo" >'+formatted_time+'</span></div>';
diff --git a/calendar/js/et2_widget_timegrid.js b/calendar/js/et2_widget_timegrid.js
index 8344378a7d..1ae7e20d36 100644
--- a/calendar/js/et2_widget_timegrid.js
+++ b/calendar/js/et2_widget_timegrid.js
@@ -339,7 +339,7 @@ var et2_calendar_timegrid = et2_valueWidget.extend([et2_IDetachedDOM, et2_IResiz
 			else
 			{
 				time = jQuery.datepicker.formatTime(
-					egw.preference("timeformat") == 12 ? "h:mmtt" : "HH:mm",
+					egw.preference("timeformat") === "12" ? "h:mmtt" : "HH:mm",
 					{
 						hour: element.dropEnd.attr('data-hour'),
 						minute: element.dropEnd.attr('data-minute'),
@@ -606,14 +606,14 @@ var et2_calendar_timegrid = et2_valueWidget.extend([et2_IDetachedDOM, et2_IResiz
 			html += '<div class="calendar_calTimeRow" style="height: '+this.rowHeight+'px;">';
 			// show time for full hours, always for 45min interval and at least on every 3 row
 			var time = jQuery.datepicker.formatTime(
-					egw.preference("timeformat") == 12 ? "h:mmtt" : "HH:mm",
+					egw.preference("timeformat") === "12" ? "h:mmtt" : "HH:mm",
 					{
 						hour: t / 60,
 						minute: t % 60,
 						seconds: 0,
 						timezone: 0
 					},
-					{"ampm": (egw.preference("timeformat") == "12")}
+					{"ampm": (egw.preference("timeformat") === "12")}
 				);
 			if(t <= wd_start && t + granularity > wd_start)
 			{
diff --git a/calendar/templates/default/app.css b/calendar/templates/default/app.css
index e001253fdc..0b6032fe74 100644
--- a/calendar/templates/default/app.css
+++ b/calendar/templates/default/app.css
@@ -194,7 +194,7 @@ e.g. the div with class calendar_calTimeGrid is generated by the timeGridWidget
 	top: 0px;
 	/*	bottom: 0px; does NOT work in IE, IE needs height: 100%! */
 	height: 100%;
-	left: 45px;
+	left: 58px;
 	right: 0px;
 	white-space: nowrap;
 }
@@ -301,7 +301,7 @@ e.g. the div with class calendar_calTimeGrid is generated by the timeGridWidget
 .calendar_calGridHeader > div {
 	position: relative;
 	height: 100%;
-	margin-left: 42px;
+	margin-left: 55px;
 	width: initial;
 	white-space: nowrap;
 	border-left: 1px solid silver;