diff --git a/src/commonMain/kotlin/de/kif/common/DateFormat.kt b/src/commonMain/kotlin/de/kif/common/DateFormat.kt
index 9a0146a..63de1f6 100644
--- a/src/commonMain/kotlin/de/kif/common/DateFormat.kt
+++ b/src/commonMain/kotlin/de/kif/common/DateFormat.kt
@@ -1,19 +1,27 @@
 package de.kif.common
 
-import com.soywiz.klock.DateFormat
-import com.soywiz.klock.KlockLocale
-import com.soywiz.klock.format
+import com.soywiz.klock.*
 import com.soywiz.klock.locale.german
 
-fun formatDateTime(unix: Long) =
+fun formatDateTime(unix: Long, timezone: Long) =
     DateFormat("EEEE, d. MMMM y HH:mm")
         .withLocale(KlockLocale.german)
-        .format(unix)
+        .format(DateTimeTz.utc(DateTime(unix), TimezoneOffset(timezone.toDouble())))
 
-fun formatDate(unix: Long) =
+fun formatDate(unix: Long, timezone: Long) =
     DateFormat("EEEE, d. MMMM y")
         .withLocale(KlockLocale.german)
-        .format(unix)
+        .format(DateTimeTz.utc(DateTime(unix), TimezoneOffset(timezone.toDouble())))
+
+fun formatDateWithoutYear(unix: Long, timezone: Long) =
+    DateFormat("EEEE, d. MMMM")
+        .withLocale(KlockLocale.german)
+        .format(DateTimeTz.utc(DateTime(unix), TimezoneOffset(timezone.toDouble())))
+
+fun formatTime(unix: Long, timezone: Long) =
+    DateFormat("HH:mm")
+        .withLocale(KlockLocale.german)
+        .format(DateTimeTz.utc(DateTime(unix), TimezoneOffset(timezone.toDouble())))
 
 fun formatTimeDiff(time: Long, now: Long): String {
     var dt = (time - now) / 1000
@@ -42,12 +50,15 @@ fun formatTimeDiff(time: Long, now: Long): String {
                 .withLocale(KlockLocale.german)
                 .format(time)
 
-            if ((ht.substringBefore(":").toIntOrNull() ?: 0) < nowHour ) {
+            if ((ht.substringBefore(":").toIntOrNull() ?: 0) < nowHour) {
                 "morgen"
             } else "um $ht"
         }
         hours > 0L -> {
-            "in " +hours.toString().padStart(2, '0') + ":" + (minutes + if (seconds > 0) 1 else 0).toString().padStart(2, '0')
+            "in " + hours.toString().padStart(2, '0') + ":" + (minutes + if (seconds > 0) 1 else 0).toString().padStart(
+                2,
+                '0'
+            )
         }
         minutes > 0L -> {
             "in 00:" + (minutes + if (seconds > 0) 1 else 0).toString().padStart(2, '0')
diff --git a/src/jsMain/kotlin/de/kif/frontend/main.kt b/src/jsMain/kotlin/de/kif/frontend/main.kt
index 782ce78..8dc9572 100644
--- a/src/jsMain/kotlin/de/kif/frontend/main.kt
+++ b/src/jsMain/kotlin/de/kif/frontend/main.kt
@@ -10,11 +10,16 @@ import de.kif.frontend.views.overview.initPostEdit
 import de.kif.frontend.views.overview.initPosts
 import de.kif.frontend.views.table.initTableLayout
 import de.westermann.kwebview.components.init
+import org.w3c.dom.get
 import kotlin.browser.document
 
+var timezoneOffset = 0L
+
 fun main() = init {
     PushServiceClient()
 
+    timezoneOffset = document.body?.dataset?.get("timezone")?.toLongOrNull() ?: 0L
+
     if (document.getElementsByClassName("calendar").length > 0) {
         initCalendar()
     }
diff --git a/src/jsMain/kotlin/de/kif/frontend/views/RoomConstraints.kt b/src/jsMain/kotlin/de/kif/frontend/views/RoomConstraints.kt
index aa511e5..f0df9f4 100644
--- a/src/jsMain/kotlin/de/kif/frontend/views/RoomConstraints.kt
+++ b/src/jsMain/kotlin/de/kif/frontend/views/RoomConstraints.kt
@@ -1,6 +1,7 @@
 package de.kif.frontend.views
 
 import de.kif.common.formatDate
+import de.kif.frontend.timezoneOffset
 import de.westermann.kwebview.View
 import de.westermann.kwebview.components.InputType
 import de.westermann.kwebview.components.InputView
@@ -22,7 +23,7 @@ fun initRoomConstraints() {
 
     fun updateDateView(inputGroup: HTMLElement, day: Int) {
         val date = referenceDate + (day * 1000 * 60 * 60 * 24)
-        val dateName = formatDate(date)
+        val dateName = formatDate(date, timezoneOffset)
         inputGroup.dataset["hint"] = dateName
     }
 
@@ -69,8 +70,8 @@ fun initRoomConstraints() {
             })
 
             for (e in child.children.iterator()) {
-                if (e.classList.contains("-day-")) {
-                    val input = InputView.wrap(e as HTMLInputElement)
+                if (e is HTMLInputElement && e.name.contains("-day-")) {
+                    val input = InputView.wrap(e)
 
                     updateDateView(child, input.value.toIntOrNull() ?: 0)
                     input.valueProperty.onChange {
diff --git a/src/jsMain/kotlin/de/kif/frontend/views/WorkGroupConstraints.kt b/src/jsMain/kotlin/de/kif/frontend/views/WorkGroupConstraints.kt
index b8fb1b4..c871795 100644
--- a/src/jsMain/kotlin/de/kif/frontend/views/WorkGroupConstraints.kt
+++ b/src/jsMain/kotlin/de/kif/frontend/views/WorkGroupConstraints.kt
@@ -4,6 +4,7 @@ import de.kif.common.formatDate
 import de.kif.frontend.launch
 import de.kif.frontend.repository.RoomRepository
 import de.kif.frontend.repository.WorkGroupRepository
+import de.kif.frontend.timezoneOffset
 import de.westermann.kobserve.event.EventListener
 import de.westermann.kwebview.View
 import de.westermann.kwebview.async
@@ -41,7 +42,7 @@ fun initWorkGroupConstraints() {
 
     fun updateDateView(inputGroup: HTMLElement, day: Int) {
         val date = referenceDate + (day * 1000 * 60 * 60 * 24)
-        val dateName = formatDate(date)
+        val dateName = formatDate(date, timezoneOffset)
         inputGroup.dataset["hint"] = dateName
     }
 
@@ -279,8 +280,8 @@ fun initWorkGroupConstraints() {
             })
 
             for (e in child.children.iterator()) {
-                if (e.classList.contains("-day-")) {
-                    val input = InputView.wrap(e as HTMLInputElement)
+                if (e is HTMLInputElement && e.name.contains("-day-")) {
+                    val input = InputView.wrap(e)
 
                     updateDateView(child, input.value.toIntOrNull() ?: 0)
                     input.valueProperty.onChange {
diff --git a/src/jsMain/kotlin/de/kif/frontend/views/board/Board.kt b/src/jsMain/kotlin/de/kif/frontend/views/board/Board.kt
index bc34286..c19800b 100644
--- a/src/jsMain/kotlin/de/kif/frontend/views/board/Board.kt
+++ b/src/jsMain/kotlin/de/kif/frontend/views/board/Board.kt
@@ -1,11 +1,10 @@
 package de.kif.frontend.views.board
 
-import com.soywiz.klock.DateFormat
-import com.soywiz.klock.DateTimeTz
-import com.soywiz.klock.KlockLocale
-import com.soywiz.klock.locale.german
+import de.kif.common.formatDate
+import de.kif.common.formatTime
 import de.kif.frontend.launch
 import de.kif.frontend.repository.ScheduleRepository
+import de.kif.frontend.timezoneOffset
 import de.kif.frontend.views.overview.getByClassOrCreate
 import de.westermann.kwebview.interval
 import de.westermann.kwebview.iterator
@@ -26,7 +25,6 @@ fun initBoard() {
     val referenceInitTime = dateContainer.dataset["now"]?.toLongOrNull() ?: initTime
     val diff = initTime - referenceInitTime
 
-
     val boardRunning = document.getElementsByClassName("board-running")[0] as HTMLElement
     val scheduleList = mutableListOf<BoardSchedule>()
     val runningReferenceTime = boardRunning.dataset["reference"]?.toLongOrNull() ?: 0L
@@ -58,16 +56,8 @@ fun initBoard() {
     interval(1000) {
         val now = Date.now().toLong() + diff
 
-        val dt = DateTimeTz.fromUnixLocal(now)
-
-        timeView.textContent = DateFormat("HH:mm")
-            .withLocale(KlockLocale.german)
-            .format(dt)
-
-        dateView.textContent = DateFormat("EEEE, d. MMMM y")
-            .withLocale(KlockLocale.german)
-            .format(dt)
-
+        timeView.textContent = formatTime(now, timezoneOffset)
+        dateView.textContent = formatDate(now, timezoneOffset)
 
         scheduleList.forEach { it.updateTime(now) }
     }
diff --git a/src/jsMain/kotlin/de/kif/frontend/views/overview/PostView.kt b/src/jsMain/kotlin/de/kif/frontend/views/overview/PostView.kt
index df2f59c..4396227 100644
--- a/src/jsMain/kotlin/de/kif/frontend/views/overview/PostView.kt
+++ b/src/jsMain/kotlin/de/kif/frontend/views/overview/PostView.kt
@@ -3,6 +3,7 @@ package de.kif.frontend.views.overview
 import de.kif.common.formatDateTime
 import de.kif.frontend.launch
 import de.kif.frontend.repository.PostRepository
+import de.kif.frontend.timezoneOffset
 import de.westermann.kobserve.event.emit
 import de.westermann.kwebview.View
 import de.westermann.kwebview.components.Link
@@ -45,7 +46,7 @@ class PostView(
             }
 
             contentView.innerHTML = PostRepository.htmlByUrl(p.url)
-            footerView.innerText = formatDateTime(p.createdAt)
+            footerView.innerText = formatDateTime(p.createdAt, timezoneOffset)
 
             emit(PostChangeEvent(postId))
         }
diff --git a/src/jvmMain/kotlin/de/kif/backend/Configuration.kt b/src/jvmMain/kotlin/de/kif/backend/Configuration.kt
index 038f8b1..8bc2773 100644
--- a/src/jvmMain/kotlin/de/kif/backend/Configuration.kt
+++ b/src/jvmMain/kotlin/de/kif/backend/Configuration.kt
@@ -77,7 +77,13 @@ object Configuration {
         val referenceDate: Date by lazy {
             val sdf = SimpleDateFormat("yyyy-MM-dd")
             sdf.timeZone = TimeZone.getTimeZone(ZoneId.of("UTC"))
-            sdf.parse(reference)
+            val calendar = Calendar.getInstance()
+            calendar.time = sdf.parse(reference)
+            calendar.set(Calendar.HOUR_OF_DAY, 0)
+            calendar.set(Calendar.MINUTE, 0)
+            calendar.set(Calendar.SECOND, 0)
+            calendar.set(Calendar.MILLISECOND, 0)
+            calendar.time
         }
 
         val offset by c(ScheduleSpec.offset)
diff --git a/src/jvmMain/kotlin/de/kif/backend/route/Board.kt b/src/jvmMain/kotlin/de/kif/backend/route/Board.kt
index 7ed335e..5df9215 100644
--- a/src/jvmMain/kotlin/de/kif/backend/route/Board.kt
+++ b/src/jvmMain/kotlin/de/kif/backend/route/Board.kt
@@ -25,7 +25,7 @@ data class BoardSchedule(
 
 suspend fun getUpcoming(limit: Int = 8): List<Schedule> {
     val now =
-        ((Date().time + Configuration.Schedule.offset) / (1000 * 60)).toInt() -
+        ((Date().time) / (1000 * 60)).toInt() -
                 (Configuration.Schedule.referenceDate.time / (1000 * 60))
     return ScheduleRepository.all()
         .map {
@@ -49,7 +49,6 @@ fun Route.board() {
 
         val now = Date()
         val referenceTime = Configuration.Schedule.referenceDate.time
-        val timeOffset = Configuration.Schedule.offset
 
         val refDate = Configuration.Schedule.referenceDate
 
@@ -86,7 +85,7 @@ fun Route.board() {
         min = (min / 60 - 1) * 60
         max = (max / 60 + 2) * 60
 
-        val nowLocale = now.time + timeOffset
+        val nowLocale = now.time
         respondMain(true, true) { theme ->
             content {
                 val announcement = AnnouncementRepository.getAnnouncement()
@@ -162,7 +161,7 @@ fun Route.board() {
                         div("board-logo") {
                             img("KIF 47.0", "$prefix/static/images/logo.svg")
                             div("board-header-date") {
-                                attributes["data-now"] = (now.time - timeOffset).toString()
+                                attributes["data-now"] = (now.time).toString()
                             }
                         }
                     }
diff --git a/src/jvmMain/kotlin/de/kif/backend/route/Calendar.kt b/src/jvmMain/kotlin/de/kif/backend/route/Calendar.kt
index 6c53dab..65ee77c 100644
--- a/src/jvmMain/kotlin/de/kif/backend/route/Calendar.kt
+++ b/src/jvmMain/kotlin/de/kif/backend/route/Calendar.kt
@@ -1,7 +1,7 @@
 package de.kif.backend.route
 
 import com.soywiz.klock.*
-import com.soywiz.klock.locale.german
+import com.soywiz.klock.jvm.toDateTime
 import de.kif.backend.Configuration
 import de.kif.backend.isAuthenticated
 import de.kif.backend.prefix
@@ -10,6 +10,7 @@ import de.kif.backend.repository.ScheduleRepository
 import de.kif.backend.repository.TrackRepository
 import de.kif.backend.view.respondMain
 import de.kif.common.CALENDAR_GRID_WIDTH
+import de.kif.common.formatDateWithoutYear
 import de.kif.common.model.Permission
 import de.kif.common.model.Room
 import de.kif.common.model.Schedule
@@ -148,7 +149,7 @@ fun DIV.renderCalendar(
 
                                 val cellSchedules = (start..end).flatMap { schedules[room]?.get(it) ?: emptyList() }
 
-                                for(schedule in cellSchedules) {
+                                for (schedule in cellSchedules) {
                                     calendarEntry(schedule, diff, currentTime)
                                 }
                             }
@@ -266,9 +267,7 @@ fun Route.calendar() {
 
         val refDate = DateTime(Configuration.Schedule.referenceDate.time)
         val date = refDate + day.days
-        val dateString = DateFormat("EEEE, d. MMMM")
-            .withLocale(KlockLocale.german)
-            .format(date)
+        val dateString = formatDateWithoutYear(date.unixMillisLong, Configuration.Schedule.offset)
 
         respondMain {
             content {
diff --git a/src/jvmMain/kotlin/de/kif/backend/route/News.kt b/src/jvmMain/kotlin/de/kif/backend/route/News.kt
index 4d3662b..0f2d2ef 100644
--- a/src/jvmMain/kotlin/de/kif/backend/route/News.kt
+++ b/src/jvmMain/kotlin/de/kif/backend/route/News.kt
@@ -60,7 +60,7 @@ fun DIV.createPost(post: Post, editable: Boolean = false, additionalClasses: Str
                     }
                 }
                 div("post-footer") {
-                    +formatDateTime(post.createdAt)
+                    +formatDateTime(post.createdAt, Configuration.Schedule.offset)
                 }
             }
         }
diff --git a/src/jvmMain/kotlin/de/kif/backend/view/MainTemplate.kt b/src/jvmMain/kotlin/de/kif/backend/view/MainTemplate.kt
index 2e5785d..2ef0e49 100644
--- a/src/jvmMain/kotlin/de/kif/backend/view/MainTemplate.kt
+++ b/src/jvmMain/kotlin/de/kif/backend/view/MainTemplate.kt
@@ -1,5 +1,6 @@
 package de.kif.backend.view
 
+import de.kif.backend.Configuration
 import de.kif.backend.PortalSession
 import de.kif.backend.Resources
 import de.kif.backend.prefix
@@ -74,9 +75,11 @@ class MainTemplate(
                 }
             }
         }
+
         body {
             attributes["data-timestamp"] = currentTimeMillis().toString()
             attributes["data-signature"] = PushService.signature
+            attributes["data-timezone"] = Configuration.Schedule.offset.toString()
 
             if (!noMenu) {
                 insert(MenuTemplate(url, user)) {}