fix(agenda): localize dates and refine the range bar

Localize every agenda date via a new localizedDateFormatter helper that lays a
field skeleton out in the locale's own order (Android best-pattern), instead of
a hardcoded day-month-year layout: the range-window summary, the screen's day
headers, and the widget's day headers. This also fixes the window mixing two
orders (e.g. "15 Jul – Aug 13, 2026").

Refine the range bar: the banner drops the range name (it already sits on the
selector button beside it) and shows just the concrete dates; the selector keeps
a subtle neutral surface tint — distinct from the top-bar view switcher's
secondary container so the two don't compete — and its right edge lines up with
the switcher. The anchored empty-today card takes a single event row's resting
corner radius.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaRange.kt

@@ -1,10 +1,9 @@
 package de.jeanlucmakiola.calendula.ui.agenda
 
+import de.jeanlucmakiola.calendula.ui.common.localizedDateFormatter
 import kotlinx.datetime.DayOfWeek
 import kotlinx.datetime.LocalDate
 import java.time.YearMonth
-import java.time.format.DateTimeFormatter
-import java.time.format.FormatStyle
 import java.util.Locale
 
 /**
@@ -87,10 +86,12 @@ fun parseAgendaRange(stored: String?, default: AgendaRange): AgendaRange = when
 
 /**
  * The concrete span the range covers, starting at [start] through [end]
- * (inclusive), for a human-readable header:
- * - [AgendaRange.Day] → a single medium date ("27 Jun 2026")
+ * (inclusive), for a human-readable header. Both ends use the same day-month
+ * order so a span never mixes "15 Jul" with "Aug 13, 2026":
+ * - [AgendaRange.Day] → a single date ("27 Jun 2026")
  * - [AgendaRange.ThisMonth] → month and year ("June 2026")
- * - everything else → "start – end" ("27 Jun – 3 Jul 2026")
+ * - everything else → "start – end" ("27 Jun – 3 Jul 2026"), with the start's
+ *   year shown too only when it differs from the end's.
  */
 fun agendaRangeWindowSummary(
     range: AgendaRange,
@@ -100,11 +101,15 @@ fun agendaRangeWindowSummary(
 ): String {
     val javaStart = java.time.LocalDate.of(start.year, start.month.ordinal + 1, start.day)
     val javaEnd = java.time.LocalDate.of(end.year, end.month.ordinal + 1, end.day)
-    val medium = DateTimeFormatter.ofLocalizedDate(FormatStyle.MEDIUM).withLocale(locale)
+    val dayMonth = localizedDateFormatter(locale, "dMMM")
+    val dayMonthYear = localizedDateFormatter(locale, "dMMMy")
     return when (range) {
-        AgendaRange.Day -> medium.format(javaStart)
-        AgendaRange.ThisMonth -> DateTimeFormatter.ofPattern("LLLL yyyy", locale).format(javaStart)
-        else -> "${DateTimeFormatter.ofPattern("d MMM", locale).format(javaStart)} – ${medium.format(javaEnd)}"
+        AgendaRange.Day -> dayMonthYear.format(javaStart)
+        AgendaRange.ThisMonth -> localizedDateFormatter(locale, "LLLLy").format(javaStart)
+        else -> {
+            val startFmt = if (start.year == end.year) dayMonth else dayMonthYear
+            "${startFmt.format(javaStart)} – ${dayMonthYear.format(javaEnd)}"
+        }
     }
 }
 

app/src/main/java/de/jeanlucmakiola/calendula/ui/agenda/AgendaScreen.kt

@@ -15,17 +15,17 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
-import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.lazy.itemsIndexed
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Coffee
-import androidx.compose.material.icons.filled.DateRange
 import androidx.compose.material.icons.filled.Menu
 import androidx.compose.material.icons.filled.Search
+import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.Card
 import androidx.compose.material3.DrawerValue
+import androidx.compose.material3.FilledTonalButton
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.Icon
 import androidx.compose.material3.IconButton
@@ -66,6 +66,7 @@ import de.jeanlucmakiola.calendula.ui.common.CalendarFabColumn
 import de.jeanlucmakiola.calendula.ui.common.CalendarFailure
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.IMPLEMENTED_VIEWS
+import de.jeanlucmakiola.calendula.ui.common.localizedDateFormatter
 import de.jeanlucmakiola.calendula.ui.common.EventDimAlpha
 import de.jeanlucmakiola.floret.components.GroupedRow
 import de.jeanlucmakiola.floret.components.Position
@@ -84,7 +85,6 @@ import kotlinx.datetime.TimeZone
 import kotlinx.datetime.plus
 import kotlinx.datetime.toLocalDateTime
 import kotlin.time.Instant
-import java.time.format.TextStyle as JavaTextStyle
 import java.util.Locale
 
 private val zone = TimeZone.currentSystemDefault()
@@ -172,9 +172,11 @@ fun AgendaScreen(
                 successState?.takeIf { it.showRangeBar }?.let { s ->
                     Row(
                         verticalAlignment = Alignment.CenterVertically,
+                        // end aligns the selector's right edge with the top-bar view
+                        // switcher (its 8.dp margin + the app bar's 4.dp inset).
                         modifier = Modifier
                             .fillMaxWidth()
-                            .padding(start = 28.dp, end = 16.dp, top = 8.dp, bottom = 8.dp),
+                            .padding(start = 28.dp, end = 12.dp, top = 8.dp, bottom = 8.dp),
                     ) {
                         AgendaRangeBanner(
                             range = s.range,
@@ -216,9 +218,11 @@ fun AgendaScreen(
 }
 
 /**
- * A compact tonal pill showing the agenda's current range. Tapping it opens the
- * range picker as a session-only override. Filled with the primary container
- * while an override is active, so the temporary state is obvious.
+ * The agenda's current range, tapped to open the range picker as a session-only
+ * override. Shares the top-bar view switcher's button shape so the two read as a
+ * family, but stays low-emphasis — a subtle neutral surface tint rather than the
+ * switcher's secondary container, so it doesn't compete. Fills with the primary
+ * container only while an override is active, to make that temporary state clear.
  */
 @Composable
 private fun AgendaRangePill(
@@ -227,43 +231,34 @@ private fun AgendaRangePill(
     onClick: () -> Unit,
     modifier: Modifier = Modifier,
 ) {
-    val container = if (isOverride) {
-        MaterialTheme.colorScheme.primaryContainer
-    } else {
-        MaterialTheme.colorScheme.surfaceContainerHigh
-    }
-    val content = if (isOverride) {
-        MaterialTheme.colorScheme.onPrimaryContainer
-    } else {
-        MaterialTheme.colorScheme.onSurfaceVariant
-    }
-    Surface(
-        color = container,
-        contentColor = content,
-        shape = RoundedCornerShape(50),
-        modifier = modifier.clickable(onClick = onClick),
+    FilledTonalButton(
+        onClick = onClick,
+        shape = MaterialTheme.shapes.large,
+        colors = ButtonDefaults.filledTonalButtonColors(
+            containerColor = if (isOverride) {
+                MaterialTheme.colorScheme.primaryContainer
+            } else {
+                MaterialTheme.colorScheme.surfaceContainerHigh
+            },
+            contentColor = if (isOverride) {
+                MaterialTheme.colorScheme.onPrimaryContainer
+            } else {
+                MaterialTheme.colorScheme.onSurfaceVariant
+            },
+        ),
+        modifier = modifier,
     ) {
-        Row(
-            verticalAlignment = Alignment.CenterVertically,
-            modifier = Modifier.padding(horizontal = 16.dp, vertical = 10.dp),
-        ) {
-            Icon(
-                imageVector = Icons.Filled.DateRange,
-                contentDescription = null,
-                modifier = Modifier.size(18.dp),
-            )
-            Spacer(Modifier.width(8.dp))
-            Text(
-                text = agendaRangeLabel(range),
-                style = MaterialTheme.typography.labelLarge,
-            )
-        }
+        Text(
+            text = agendaRangeLabel(range),
+            style = MaterialTheme.typography.labelLarge,
+        )
     }
 }
 
 /**
- * A header naming the concrete window currently shown, e.g. "Showing all events
- * for · Today, 27 Jun 2026" / "This week, 27 Jun – 3 Jul" / "This month, June 2026".
+ * A header naming the concrete window currently shown under a "showing …" label,
+ * e.g. "27 Jun 2026" / "27 Jun – 3 Jul 2026" / "June 2026". The range's name
+ * lives on the selector button beside it, so it isn't repeated here.
  */
 @Composable
 private fun AgendaRangeBanner(
@@ -280,8 +275,10 @@ private fun AgendaRangeBanner(
             style = MaterialTheme.typography.labelMedium,
             color = MaterialTheme.colorScheme.onSurfaceVariant,
         )
+        // Just the concrete dates — the range's name ("Next 30 days") already
+        // sits on the selector button to the right, so repeating it here is noise.
         Text(
-            text = "${agendaRangeLabel(range)}, $window",
+            text = window,
             style = MaterialTheme.typography.titleMedium,
             color = MaterialTheme.colorScheme.onSurface,
         )
@@ -418,6 +415,8 @@ private fun AgendaDayHeader(
 @Composable
 private fun AgendaEmptyDayRow(onClick: () -> Unit) {
     Card(
+        // Match a single event row's resting corner radius (floret groupedShape).
+        shape = RoundedCornerShape(22.dp),
         modifier = Modifier
             .fillMaxWidth()
             .padding(horizontal = 16.dp, vertical = 4.dp)
@@ -575,7 +574,7 @@ private fun formatTime(instant: Instant, is24Hour: Boolean, locale: Locale): Str
 private fun formatAgendaDate(date: LocalDate): String {
     val locale = Locale.getDefault()
     val java = java.time.LocalDate.of(date.year, date.month.ordinal + 1, date.day)
-    val weekday = java.dayOfWeek.getDisplayName(JavaTextStyle.SHORT, locale)
-    val monthName = java.month.getDisplayName(JavaTextStyle.SHORT, locale)
-    return "$weekday, ${date.day}. $monthName ${date.year}"
+    // Weekday + date in the locale's own field order (e.g. "Wed, Jun 17, 2026"
+    // vs "Mi., 17. Juni 2026") rather than a hardcoded day-month-year layout.
+    return localizedDateFormatter(locale, "EEEdMMMy").format(java)
 }

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

@@ -4,6 +4,7 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.core.os.ConfigurationCompat
+import java.time.format.DateTimeFormatter
 import java.util.Locale
 
 /**
@@ -18,3 +19,15 @@ fun currentLocale(): Locale {
         ConfigurationCompat.getLocales(configuration).get(0) ?: Locale.getDefault()
     }
 }
+
+/**
+ * A [DateTimeFormatter] for [skeleton]'s fields laid out in [locale]'s own order
+ * (via Android's best-pattern matching), so dates read naturally per locale
+ * instead of a hardcoded day-month-year order. [skeleton] lists the wanted
+ * fields, e.g. "dMMMy" (day, abbreviated month, year) or "EEEdMMM" (weekday too).
+ */
+fun localizedDateFormatter(locale: Locale, skeleton: String): DateTimeFormatter =
+    DateTimeFormatter.ofPattern(
+        android.text.format.DateFormat.getBestDateTimePattern(locale, skeleton),
+        locale,
+    )

app/src/main/java/de/jeanlucmakiola/calendula/widget/agenda/AgendaWidget.kt

@@ -55,6 +55,7 @@ import de.jeanlucmakiola.calendula.ui.agenda.parseAgendaRange
 import de.jeanlucmakiola.calendula.ui.common.CalendarView
 import de.jeanlucmakiola.calendula.ui.common.EventDimAlpha
 import de.jeanlucmakiola.calendula.ui.common.formatTimeOfDay
+import de.jeanlucmakiola.calendula.ui.common.localizedDateFormatter
 import de.jeanlucmakiola.floret.components.pastelize
 import de.jeanlucmakiola.calendula.widget.AgendaWidgetData
 import de.jeanlucmakiola.calendula.widget.CalendulaGlanceTheme
@@ -67,7 +68,6 @@ import kotlinx.datetime.TimeZone
 import kotlinx.datetime.plus
 import kotlinx.datetime.toLocalDateTime
 import kotlin.time.Instant
-import java.time.format.TextStyle as JavaTextStyle
 import java.util.Locale
 
 /**
@@ -399,9 +399,9 @@ private fun agendaDayLabel(context: Context, date: LocalDate, today: LocalDate):
     }
     val locale = Locale.getDefault()
     val java = java.time.LocalDate.of(date.year, date.month.ordinal + 1, date.day)
-    val weekday = java.dayOfWeek.getDisplayName(JavaTextStyle.SHORT, locale)
-    val monthName = java.month.getDisplayName(JavaTextStyle.SHORT, locale)
-    val formatted = "$weekday, ${date.day} $monthName"
+    // Weekday + date in the locale's own field order (compact: no year), rather
+    // than a hardcoded day-month layout.
+    val formatted = localizedDateFormatter(locale, "EEEdMMM").format(java)
     return if (relative != null) "$relative · $formatted" else formatted
 }