diff --git a/source/data/localization/deu.loc.json b/source/data/localization/deu.loc.json
index ff10470..5245331 100644
--- a/source/data/localization/deu.loc.json
+++ b/source/data/localization/deu.loc.json
@@ -4,6 +4,7 @@
 	},
 	"tree": {
 		"common.timezone_shift": "Zeitzonen-Verschiebung",
+		"common.timezone_indicator": "ZZ:",
 		"common.date": "Datum",
 		"common.time": "Uhrzeit",
 		"common.weekday.monday": "Mo",
@@ -23,6 +24,7 @@
 		"access_level.admin": "voll",
 		"event.event": "Termin",
 		"event.name": "Name",
+		"event.when": "Zeit",
 		"event.begin": "Anfang",
 		"event.end": "Ende",
 		"event.location": "Ort",
diff --git a/source/data/localization/eng.loc.json b/source/data/localization/eng.loc.json
index 8977a02..87012f1 100644
--- a/source/data/localization/eng.loc.json
+++ b/source/data/localization/eng.loc.json
@@ -4,6 +4,7 @@
 	},
 	"tree": {
 		"common.timezone_shift": "Timezone shift",
+		"common.timezone_indicator": "TZ:",
 		"common.date": "date",
 		"common.time": "time",
 		"common.weekday.monday": "Mon",
@@ -23,6 +24,7 @@
 		"access_level.admin": "full",
 		"event.event": "event",
 		"event.name": "name",
+		"event.when": "time",
 		"event.begin": "begin",
 		"event.end": "end",
 		"event.location": "location",
diff --git a/source/logic/helpers.ts b/source/logic/helpers.ts
index 612da3d..dd6d418 100644
--- a/source/logic/helpers.ts
+++ b/source/logic/helpers.ts
@@ -75,106 +75,6 @@ namespace _zeitbild.frontend_web.helpers
 	}
 	
 	
-	/**
-	 * @todo timezone
-	 */
-	export function date_format(
-		date : lib_plankton.pit.type_date
-	) : string
-	{
-		return lib_plankton.string.coin(
-			"{{year}}-{{month}}-{{day}}",
-			{
-				"year": date.year.toFixed(0).padStart(4, "0"),
-				"month": date.month.toFixed(0).padStart(2, "0"),
-				"day": date.day.toFixed(0).padStart(2, "0"),
-			}
-		);
-	}
-	
-	
-	/**
-	 * @todo timezone
-	 */
-	export function time_format(
-		time : lib_plankton.pit.type_time
-	) : string
-	{
-		return lib_plankton.string.coin(
-			"{{hour}}:{{minute}}",
-			{
-				"hour": time.hour.toFixed(0).padStart(2, "0"),
-				"minute": time.minute.toFixed(0).padStart(2, "0"),
-				"second": time.second.toFixed(0).padStart(2, "0"),
-			}
-		);
-	}
-	
-	
-	/**
-	 * @todo timezone
-	 */
-	export function datetime_format(
-		datetime : (null | lib_plankton.pit.type_datetime)
-	) : string
-	{
-		if (datetime === null) {
-			return "-";
-		}
-		else {
-			return lib_plankton.string.coin(
-				"{{date}}{{macro_time}}",
-				{
-					"date": date_format(datetime.date),
-					"macro_time": (
-						(datetime.time === null)
-						?
-						""
-						:
-						lib_plankton.string.coin(
-							",{{time}}",
-							{
-								"time": time_format(datetime.time),
-							}
-						)
-					),
-				}
-			);
-		}
-	}
-	
-	
-	/**
-	 */
-	export function timespan_format(
-		from : lib_plankton.pit.type_datetime,
-		to : (null | lib_plankton.pit.type_datetime)
-	) : string
-	{
-		let result : string = "";
-		result += datetime_format(from);
-		if (to === null) {
-			// do nothing
-		}
-		else {
-			result += " - ";
-			if (
-				(from.date.year === to.date.year)
-				&&
-				(from.date.month === to.date.month)
-				&&
-				(from.date.day === to.date.day)
-			) {
-				// only time
-				result += time_format(to.time);
-			}
-			else {
-				result += datetime_format(to);
-			}
-		}
-		return result;
-	}
-	
 	/**
 	 */
 	export function input_access_level(
diff --git a/source/widgets/listview/logic.ts b/source/widgets/listview/logic.ts
index bb8a945..9ede8ec 100644
--- a/source/widgets/listview/logic.ts
+++ b/source/widgets/listview/logic.ts
@@ -144,7 +144,15 @@ namespace _zeitbild.frontend_web.widgets.listview
 											{
 												"name_value": entry.event_object.name,
 												"calendar_value": entry.calendar_name,
-												"when_value": _zeitbild.frontend_web.helpers.timespan_format(entry.event_object.begin, entry.event_object.end),
+												"when_value": lib_plankton.pit.timespan_format(
+													entry.event_object.begin,
+													entry.event_object.end,
+													{
+														"timezone_indicator": lib_plankton.translate.get("common.timezone_indicator"),
+														"adjust_to_ce": true,
+														"show_timezone": false,
+													}
+												),
 												"location_label": lib_plankton.translate.get("event.location"),
 												"location_extra_classes": (
 													(entry.event_object.location === null)
diff --git a/source/widgets/weekview/logic.ts b/source/widgets/weekview/logic.ts
index f309f48..ae60a10 100644
--- a/source/widgets/weekview/logic.ts
+++ b/source/widgets/weekview/logic.ts
@@ -127,65 +127,16 @@ namespace _zeitbild.frontend_web.widgets.weekview
 					lib_plankton.string.coin(
 						"{{label}}: {{value}}\n",
 						{
-							"label": lib_plankton.translate.get("event.begin"),
-							"value": lib_plankton.string.coin(
-								"{{hour}}:{{minute}}",
+							"label": lib_plankton.translate.get("event.when"),
+							"value": lib_plankton.pit.timespan_format(
+								event_object.begin,
+								event_object.end,
 								{
-									"hour": event_object.begin.time.hour.toFixed(0).padStart(2, "0"),
-									"minute": event_object.begin.time.minute.toFixed(0).padStart(2, "0"),
+									"timezone_indicator": lib_plankton.translate.get("common.timezone_indicator"),
+									"adjust_to_ce": true,
+									"show_timezone": true,
+									"omit_date": true,
 								}
-							), // TODO: outsource
-						}
-					)
-					:
-					""
-				)
-				+
-				(
-					(event_object.end !== null)
-					?
-					lib_plankton.string.coin(
-						"{{label}}: {{value}}\n",
-						{
-							"label": lib_plankton.translate.get("event.end"),
-							"value": (
-								[
-									(
-										(
-											(event_object.end.date.year !== event_object.begin.date.year)
-											||
-											(event_object.end.date.month !== event_object.begin.date.month)
-											||
-											(event_object.end.date.day !== event_object.begin.date.day)
-										)
-										?
-										lib_plankton.string.coin(
-											"{{year}}-{{month}}-{{day}}",
-											{
-												"year": event_object.end.date.year.toFixed(0).padStart(4, "0"),
-												"month": event_object.end.date.month.toFixed(0).padStart(2, "0"),
-												"day": event_object.end.date.day.toFixed(0).padStart(2, "0"),
-											}
-										)
-										:
-										null
-									),
-									(
-										(event_object.end.time !== null)
-										?
-										lib_plankton.string.coin(
-											"{{hour}}:{{minute}}",
-											{
-												"hour": event_object.end.time.hour.toFixed(0).padStart(2, "0"),
-												"minute": event_object.end.time.minute.toFixed(0).padStart(2, "0"),
-											}
-										)
-										:
-										null
-									),
-								]
-								.filter(x => (x !== null))
-								.join(",")
 							),
 						}
 					)
@@ -438,7 +389,24 @@ namespace _zeitbild.frontend_web.widgets.weekview
 					.forEach(
 						(entry) => {
 							const distance_seconds : int = (
-								lib_plankton.pit.from_datetime(entry.event_object.begin)
+								lib_plankton.pit.from_datetime(
+									/**
+									 * so that events without a start time will be put in the correct box
+									 */
+									{
+										"timezone_shift": entry.event_object.begin.timezone_shift,
+										"date": entry.event_object.begin.date,
+										"time": (
+											entry.event_object.begin.time
+											??
+											{
+												"hour": 12,
+												"minute": 0,
+												"second": 0
+											}
+										),
+									}
+								)
 								-
 								from_pit
 							);
@@ -626,7 +594,7 @@ namespace _zeitbild.frontend_web.widgets.weekview
 													"title": lib_plankton.call.convey(
 														cell.pit,
 														[
-															lib_plankton.pit.to_datetime,
+															lib_plankton.pit.to_datetime_ce,
 															(x : lib_plankton.pit.type_datetime) => lib_plankton.string.coin(
 																"{{year}}-{{month}}-{{day}}",
 																{
@@ -640,7 +608,7 @@ namespace _zeitbild.frontend_web.widgets.weekview
 													"day": lib_plankton.call.convey(
 														cell.pit,
 														[
-															lib_plankton.pit.to_datetime,
+															lib_plankton.pit.to_datetime_ce,
 															(x : lib_plankton.pit.type_datetime) => lib_plankton.string.coin(
 																"{{day}}",
 																{
@@ -654,7 +622,7 @@ namespace _zeitbild.frontend_web.widgets.weekview
 													"rel": lib_plankton.call.convey(
 														cell.pit,
 														[
-															lib_plankton.pit.to_datetime,
+															lib_plankton.pit.to_datetime_ce,
 															(x : lib_plankton.pit.type_datetime) => lib_plankton.string.coin(
 																"{{year}}-{{month}}-{{day}}",
 																{