diff --git a/core/model/src/commonMain/kotlin/io/github/droidkaigi/confsched/model/TimetableItem.kt b/core/model/src/commonMain/kotlin/io/github/droidkaigi/confsched/model/TimetableItem.kt
index 0bcdb5cb9..53f0740c6 100644
--- a/core/model/src/commonMain/kotlin/io/github/droidkaigi/confsched/model/TimetableItem.kt
+++ b/core/model/src/commonMain/kotlin/io/github/droidkaigi/confsched/model/TimetableItem.kt
@@ -7,6 +7,7 @@ import kotlinx.collections.immutable.PersistentList
 import kotlinx.collections.immutable.toPersistentList
 import kotlinx.datetime.Instant
 import kotlinx.datetime.LocalDateTime
+import kotlinx.datetime.LocalTime
 import kotlinx.datetime.TimeZone
 import kotlinx.datetime.toInstant
 import kotlinx.datetime.toLocalDateTime
@@ -78,6 +79,14 @@ public sealed class TimetableItem {
         endsAt.toTimetableTimeString()
     }
 
+    public val startsLocalTime: LocalTime by lazy {
+        startsAt.toLocalTime()
+    }
+
+    public val endsLocalTime: LocalTime by lazy {
+        endsAt.toLocalTime()
+    }
+
     private val minutesString: String by lazy {
         val minutes = (endsAt - startsAt)
             .toComponents { minutes, _, _ -> minutes }
@@ -119,11 +128,16 @@ public sealed class TimetableItem {
     }
 }
 
-public fun Instant.toTimetableTimeString(): String {
+private fun Instant.toTimetableTimeString(): String {
     val localDate = toLocalDateTime(TimeZone.currentSystemDefault())
     return "${localDate.hour}".padStart(2, '0') + ":" + "${localDate.minute}".padStart(2, '0')
 }
 
+private fun Instant.toLocalTime(): LocalTime {
+    val localDateTime = toLocalDateTime(TimeZone.currentSystemDefault())
+    return localDateTime.time
+}
+
 public fun Session.Companion.fake(): Session {
     return Session(
         id = TimetableItemId("2"),
diff --git a/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/SearchScreenPresenter.kt b/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/SearchScreenPresenter.kt
index 546fe08f3..f5613eb06 100644
--- a/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/SearchScreenPresenter.kt
+++ b/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/SearchScreenPresenter.kt
@@ -174,8 +174,8 @@ fun searchScreenPresenter(
                 timetableListUiState = TimetableListUiState(
                     timetableItemMap = filteredSessions.groupBy {
                         TimetableListUiState.TimeSlot(
-                            startTime = it.startsAt,
-                            endTime = it.endsAt,
+                            startTime = it.startsLocalTime,
+                            endTime = it.endsLocalTime,
                         )
                     }.mapValues { entries ->
                         entries.value.sortedWith(
diff --git a/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/TimetableScreenPresenter.kt b/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/TimetableScreenPresenter.kt
index 4c8067377..574eb4970 100644
--- a/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/TimetableScreenPresenter.kt
+++ b/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/TimetableScreenPresenter.kt
@@ -101,8 +101,8 @@ fun timetableSheet(
                     ),
                 ).timetableItems.groupBy {
                     TimetableListUiState.TimeSlot(
-                        startTime = it.startsAt,
-                        endTime = it.endsAt,
+                        startTime = it.startsLocalTime,
+                        endTime = it.endsLocalTime,
                     )
                 }.mapValues { entries ->
                     entries.value.sortedWith(
diff --git a/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/section/TimetableList.kt b/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/section/TimetableList.kt
index abbfacade..82f486158 100644
--- a/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/section/TimetableList.kt
+++ b/feature/sessions/src/commonMain/kotlin/io/github/droidkaigi/confsched/sessions/section/TimetableList.kt
@@ -45,7 +45,6 @@ import io.github.droidkaigi.confsched.droidkaigiui.compositionlocal.LocalSharedT
 import io.github.droidkaigi.confsched.droidkaigiui.icon
 import io.github.droidkaigi.confsched.model.Timetable
 import io.github.droidkaigi.confsched.model.TimetableItem
-import io.github.droidkaigi.confsched.model.toTimetableTimeString
 import io.github.droidkaigi.confsched.sessions.component.TimetableNestedScrollStateHolder
 import io.github.droidkaigi.confsched.sessions.component.rememberTimetableNestedScrollConnection
 import io.github.droidkaigi.confsched.sessions.component.rememberTimetableNestedScrollStateHolder
@@ -54,11 +53,9 @@ import io.github.droidkaigi.confsched.sessions.timetableDetailSharedContentState
 import kotlinx.collections.immutable.ImmutableSet
 import kotlinx.collections.immutable.PersistentMap
 import kotlinx.collections.immutable.toImmutableSet
-import kotlinx.datetime.DateTimeUnit
 import kotlinx.datetime.Instant
+import kotlinx.datetime.LocalTime
 import kotlinx.datetime.TimeZone
-import kotlinx.datetime.atStartOfDayIn
-import kotlinx.datetime.plus
 import kotlinx.datetime.toLocalDateTime
 
 const val TimetableListTestTag = "TimetableList"
@@ -68,10 +65,17 @@ data class TimetableListUiState(
     val timetable: Timetable,
 ) {
     data class TimeSlot(
-        val startTime: Instant,
-        val endTime: Instant,
+        val startTime: LocalTime,
+        val endTime: LocalTime,
     ) {
+        val startTimeString: String get() = startTime.toTimetableTimeString()
+        val endTimeString: String get() = endTime.toTimetableTimeString()
+
         val key: String get() = "$startTime-$endTime"
+
+        private fun LocalTime.toTimetableTimeString(): String {
+            return "$hour".padStart(2, '0') + ":" + "$minute".padStart(2, '0')
+        }
     }
 }
 
@@ -112,7 +116,7 @@ internal fun TimetableList(
             val progressingSessionIndex = uiState.timetableItemMap.keys
                 .insertDummyEndOfTheDayItem() // Insert dummy at a position after last session to allow scrolling
                 .windowed(2, 1, true)
-                .indexOfFirst { clock.now() in it.first().startTime..it.last().startTime }
+                .indexOfFirst { clock.now().toLocalTime() in it.first().startTime..it.last().startTime }
 
             progressingSessionIndex.takeIf { it != -1 }?.let {
                 scrollState.scrollToItem(it)
@@ -165,8 +169,8 @@ internal fun TimetableList(
                             timeTextHeight = it.size.height
                         }
                         .offset { IntOffset(0, timeTextOffset) },
-                    startTime = time.startTime.toTimetableTimeString(),
-                    endTime = time.endTime.toTimetableTimeString(),
+                    startTime = time.startTimeString,
+                    endTime = time.endTimeString,
                 )
                 Spacer(modifier = Modifier.width(12.dp))
                 Column(verticalArrangement = Arrangement.spacedBy(12.dp)) {
@@ -230,10 +234,7 @@ internal fun TimetableList(
 }
 
 private fun ImmutableSet<TimeSlot>.insertDummyEndOfTheDayItem(): ImmutableSet<TimeSlot> {
-    val endOfTheDayInstant = first().startTime.toLocalDateTime(TimeZone.currentSystemDefault())
-        .date
-        .plus(1, DateTimeUnit.DAY)
-        .atStartOfDayIn(TimeZone.currentSystemDefault())
+    val endOfTheDayInstant = LocalTime(23, 59, 59)
     return plus(
         TimeSlot(
             startTime = endOfTheDayInstant,
@@ -241,3 +242,8 @@ private fun ImmutableSet<TimeSlot>.insertDummyEndOfTheDayItem(): ImmutableSet<Ti
         ),
     ).toImmutableSet()
 }
+
+private fun Instant.toLocalTime(): LocalTime {
+    val localDateTime = toLocalDateTime(TimeZone.currentSystemDefault())
+    return localDateTime.time
+}