fix(deps): update composebom to v2026.06.01

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/EventDetailMapper.kt

@@ -23,29 +23,26 @@ internal fun ColumnReader.toEventDetailCore(
     attendees: List<Attendee>,
     reminders: List<Reminder>,
 ): EventDetail? {
-    // DTSTART is epoch millis in UTC, so a series anchored before 1970 (common
-    // for yearly birthdays/anniversaries synced over CalDAV) is legitimately
-    // negative — only an *absent* DTSTART marks a malformed row worth dropping.
-    // Dropping negatives made every occurrence of such a series un-openable
-    // (the detail loads the ancient series-master DTSTART), see issue #34.
-    if (isNull(EventDetailProjection.IDX_DTSTART)) {
-        Log.w(TAG, "Dropping event with missing dtstart")
+    val begin = getLong(EventDetailProjection.IDX_DTSTART)
+
+    if (begin < 0L) {
+        Log.w(TAG, "Dropping event with negative dtstart=$begin")
         return null
     }
-    val begin = getLong(EventDetailProjection.IDX_DTSTART)
 
     // Recurring events store DURATION instead of DTEND, so the series row's
     // DTEND is null. Keep the event (end == begin); callers that opened a
     // specific occurrence supply the real per-occurrence times from
-    // CalendarContract.Instances. A present-but-backwards DTEND is malformed,
-    // but dropping the row would make the event un-openable — the same trap as
-    // the pre-1970 DTSTART bug above (issue #34): it would surface as the
-    // generic error screen with no way to open the event and fix it. Clamp to a
-    // zero-length event instead (matching SearchMapper's coerceAtLeast).
+    // CalendarContract.Instances. Only a present-but-backwards DTEND is malformed.
     val end = if (isNull(EventDetailProjection.IDX_DTEND)) {
         begin
     } else {
-        getLong(EventDetailProjection.IDX_DTEND).coerceAtLeast(begin)
+        val rawEnd = getLong(EventDetailProjection.IDX_DTEND)
+        if (rawEnd < begin) {
+            Log.w(TAG, "Dropping event with dtend=$rawEnd < dtstart=$begin")
+            return null
+        }
+        rawEnd
     }
 
     // Kept raw (no untitled fallback): the detail screen substitutes its own

app/src/main/java/de/jeanlucmakiola/calendula/data/calendar/SearchMapper.kt

@@ -10,11 +10,8 @@ import de.jeanlucmakiola.calendula.domain.ics.parseRfc2445DurationMillis
  * of DTEND — reconstruct the end the same way the `.ics` export does.
  */
 internal fun ColumnReader.toSearchResult(): EventInstance? {
-    // A pre-1970 series anchor is a legitimately negative epoch-millis DTSTART
-    // (see EventDetailMapper / issue #34); drop only a genuinely absent one, so
-    // long-running birthdays/anniversaries still surface in search.
-    if (isNull(SearchProjection.IDX_DTSTART)) return null
     val dtStart = getLong(SearchProjection.IDX_DTSTART)
+    if (dtStart < 0L) return null
     val end = when {
         !isNull(SearchProjection.IDX_DTEND) -> getLong(SearchProjection.IDX_DTEND)
         else -> dtStart + parseRfc2445DurationMillis(getString(SearchProjection.IDX_DURATION))

app/src/main/java/de/jeanlucmakiola/calendula/ui/common/TimePickerAlert.kt

@@ -4,9 +4,14 @@ import androidx.compose.material3.AlertDialog
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Text
 import androidx.compose.material3.TextButton
+import android.content.Context
+import android.content.res.Resources
+import android.provider.Settings
+import android.text.format.DateFormat
 import androidx.compose.material3.TimePicker
 import androidx.compose.material3.rememberTimePickerState
 import androidx.compose.runtime.Composable
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import de.jeanlucmakiola.calendula.R
 import kotlinx.datetime.LocalTime
@@ -22,13 +27,10 @@ fun TimePickerAlert(
     onConfirm: (LocalTime) -> Unit,
     onDismiss: () -> Unit,
 ) {
-    // Honour the app's own time-format preference (the value every time label
-    // reads), not the system/locale clock — otherwise an explicit 24h setting
-    // still showed an AM/PM dial (issue #27).
     val state = rememberTimePickerState(
         initialHour = initial.hour,
         initialMinute = initial.minute,
-        is24Hour = LocalUse24HourFormat.current,
+        is24Hour = deviceUses24HourClock(LocalContext.current),
     )
     AlertDialog(
         onDismissRequest = onDismiss,
@@ -43,3 +45,24 @@ fun TimePickerAlert(
         text = { TimePicker(state = state) },
     )
 }
+
+/**
+ * Whether the clock should read 24-hour, matching the rest of the device.
+ *
+ * [DateFormat.is24HourFormat] resolves a "locale default" system setting against
+ * the *app's* context locale — and this app applies a per-app language
+ * (AppCompatDelegate), so an English UI on a German-region phone would wrongly
+ * read 12-hour while the system clock shows 24-hour. So we honour an explicit
+ * system 12/24 override, and otherwise fall back to the **device** locale
+ * (Resources.getSystem), not the app's.
+ */
+private fun deviceUses24HourClock(context: Context): Boolean =
+    when (Settings.System.getString(context.contentResolver, Settings.System.TIME_12_24)) {
+        "24" -> true
+        "12" -> false
+        // 'a' is the AM/PM marker; a best-fit pattern without it is 24-hour.
+        else -> {
+            val deviceLocale = Resources.getSystem().configuration.locales[0]
+            !DateFormat.getBestDateTimePattern(deviceLocale, "jm").contains('a')
+        }
+    }

app/src/test/java/de/jeanlucmakiola/calendula/data/calendar/EventDetailMapperTest.kt

@@ -22,8 +22,8 @@ class EventDetailMapperTest {
         eventColor: Any? = null,
         eventColorKey: String? = null,
         calendarColor: Int = 0xFFAABBCC.toInt(),
-        dtstart: Long? = 1_000_000_000L,
-        dtend: Long? = 1_000_003_600L,
+        dtstart: Long = 1_000_000_000L,
+        dtend: Long = 1_000_003_600L,
         allDay: Int = 0,
         location: String? = "Berlin",
         calendarId: Long = 7L,
@@ -120,31 +120,9 @@ class EventDetailMapperTest {
     }
 
     @Test
-    fun `dtend before dtstart is clamped to a zero-length event, not dropped`() {
-        // A backwards DTEND is malformed, but dropping it would make the event
-        // un-openable (the "Something went wrong" trap, same as issue #34); keep
-        // it as a zero-length event so the user can still open and fix it.
+    fun `dtend before dtstart drops detail`() {
         val detail = detailReader(dtstart = 2000L, dtend = 1000L).toDetail()
-        assertThat(detail).isNotNull()
-        assertThat(detail!!.instance.start.toEpochMilliseconds()).isEqualTo(2000L)
-        assertThat(detail.instance.end.toEpochMilliseconds()).isEqualTo(2000L)
-    }
-
-    @Test
-    fun `pre-1970 negative dtstart is kept, not dropped (issue #34)`() {
-        // A yearly birthday/anniversary anchored before the epoch has a
-        // legitimately negative UTC epoch-millis DTSTART; recurring rows carry
-        // no DTEND (they use DURATION), so it stays end == begin.
-        val begin = -157_766_400_000L // 1965-01-01T00:00:00Z
-        val detail = detailReader(dtstart = begin, dtend = null).toDetail()
-        assertThat(detail).isNotNull()
-        assertThat(detail!!.instance.start.toEpochMilliseconds()).isEqualTo(begin)
-        assertThat(detail.instance.end.toEpochMilliseconds()).isEqualTo(begin)
-    }
-
-    @Test
-    fun `absent dtstart drops detail`() {
-        assertThat(detailReader(dtstart = null).toDetail()).isNull()
+        assertThat(detail).isNull()
     }
 
     @Test

app/src/test/java/de/jeanlucmakiola/calendula/data/calendar/SearchMapperTest.kt

@@ -1,45 +0,0 @@
-package de.jeanlucmakiola.calendula.data.calendar
-
-import com.google.common.truth.Truth.assertThat
-import org.junit.jupiter.api.Test
-
-class SearchMapperTest {
-
-    private fun searchReader(
-        id: Long = 1L,
-        calendarId: Long = 7L,
-        title: String? = "Birthday",
-        dtstart: Long? = 1_000_000_000L,
-        dtend: Long? = null,
-        duration: String? = "P1D",
-        allDay: Int = 1,
-        eventColor: Any? = null,
-        calendarColor: Int = 0xFFAABBCC.toInt(),
-        location: String? = null,
-    ): MapColumnReader = MapColumnReader(
-        SearchProjection.IDX_ID to id,
-        SearchProjection.IDX_CALENDAR_ID to calendarId,
-        SearchProjection.IDX_TITLE to title,
-        SearchProjection.IDX_DTSTART to dtstart,
-        SearchProjection.IDX_DTEND to dtend,
-        SearchProjection.IDX_DURATION to duration,
-        SearchProjection.IDX_ALL_DAY to allDay,
-        SearchProjection.IDX_EVENT_COLOR to eventColor,
-        SearchProjection.IDX_CALENDAR_COLOR to calendarColor,
-        SearchProjection.IDX_LOCATION to location,
-    )
-
-    @Test
-    fun `pre-1970 negative dtstart still surfaces in search (issue #34)`() {
-        val begin = -157_766_400_000L // 1965-01-01T00:00:00Z
-        val result = searchReader(dtstart = begin, dtend = null, duration = "P1D").toSearchResult()
-        assertThat(result).isNotNull()
-        assertThat(result!!.start.toEpochMilliseconds()).isEqualTo(begin)
-        assertThat(result.title).isEqualTo("Birthday")
-    }
-
-    @Test
-    fun `absent dtstart drops the search hit`() {
-        assertThat(searchReader(dtstart = null).toSearchResult()).isNull()
-    }
-}

gradle/libs.versions.toml

@@ -7,7 +7,7 @@ coreKtx = "1.19.0"
 appcompat = "1.7.1"
 lifecycleRuntime = "2.10.0"
 activityCompose = "1.13.0"
-composeBom = "2026.05.01"
+composeBom = "2026.06.01"
 # Material 3 Expressive APIs currently live only in the 1.5 alpha line.
 # Pin explicitly to override the BOM (which ships stable 1.4.0).
 # Re-evaluate when 1.5.0 stable lands.