feat(contacts): show source year instead of age in titles

A FREQ=YEARLY event has one static title, so a per-occurrence age is impossible
without heavy per-year exception rows. Replace {age} with {year} — the birth
year (or an anniversary's start year) — which is static and correct on every
occurrence, and shows everywhere (widgets, other apps, exports).

- renderSpecialDateTitle substitutes {year}; drop the age snapshot computation
  and the sync `today` parameter.
- Default templates become "{name}'s birthday ({year})" / "…anniversary ({year})".
- Rename the setting to "Show year" (prefs specialDatesShowYear) and remove the
  now-unneeded {age} snapshot disclaimer in the template editor.
- Update tests, CHANGELOG and the design-doc note.

lint + unit tests + assembleDebug green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/main/java/de/jeanlucmakiola/calendula/data/contacts/SpecialDatesScheduler.kt

@@ -17,10 +17,7 @@ import dagger.hilt.components.SingletonComponent
 import de.jeanlucmakiola.calendula.data.prefs.SettingsPrefs
 import de.jeanlucmakiola.calendula.data.prefs.SpecialDatesStalledReason
 import kotlinx.coroutines.flow.first
-import kotlinx.datetime.TimeZone
-import kotlinx.datetime.todayIn
 import java.util.concurrent.TimeUnit
-import kotlin.time.Clock
 
 /**
  * Schedules the contact special-dates mirror. Birthdays change rarely, so this
@@ -97,9 +94,8 @@ class SpecialDatesSyncWorker(
             return Result.success()
         }
 
-        val today = Clock.System.todayIn(TimeZone.currentSystemDefault())
         return try {
-            val result = deps.syncEngine().sync(today)
+            val result = deps.syncEngine().sync()
             val stalled = if (result == SpecialDatesSyncResult.PermissionMissing) {
                 SpecialDatesStalledReason.PermissionRevoked
             } else {

app/src/main/java/de/jeanlucmakiola/calendula/data/contacts/SpecialDatesSyncEngine.kt

@@ -14,12 +14,10 @@ import de.jeanlucmakiola.calendula.domain.SimpleRecurrence
 import de.jeanlucmakiola.calendula.domain.contacts.ContactSpecialDate
 import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
 import de.jeanlucmakiola.calendula.domain.contacts.anchorDate
-import de.jeanlucmakiola.calendula.domain.contacts.ageAtNextOccurrence
 import de.jeanlucmakiola.calendula.domain.contacts.managedEventUid
 import de.jeanlucmakiola.calendula.domain.contacts.renderSpecialDateTitle
 import de.jeanlucmakiola.calendula.domain.toRRule
 import kotlinx.coroutines.flow.first
-import kotlinx.datetime.LocalDate
 import kotlinx.datetime.LocalDateTime
 import kotlinx.datetime.LocalTime
 import java.time.ZoneId
@@ -58,11 +56,10 @@ class SpecialDatesSyncEngine @Inject constructor(
 ) {
 
     /**
-     * Reconcile every enabled type against the device's contacts. [today] anchors
-     * the age snapshot. Returns why it stopped early (disabled / permission gone)
-     * or [SpecialDatesSyncResult.Success].
+     * Reconcile every enabled type against the device's contacts. Returns why it
+     * stopped early (disabled / permission gone) or [SpecialDatesSyncResult.Success].
      */
-    suspend fun sync(today: LocalDate): SpecialDatesSyncResult {
+    suspend fun sync(): SpecialDatesSyncResult {
         if (!prefs.specialDatesEnabled.first()) return SpecialDatesSyncResult.Disabled
         if (!contacts.hasPermission()) return SpecialDatesSyncResult.PermissionMissing
 
@@ -72,7 +69,7 @@ class SpecialDatesSyncEngine @Inject constructor(
         val desiredByType = contacts.readSpecialDates().groupBy { it.type }
         val reminderCtx = readReminderContext()
         val templates = prefs.specialDatesTitleTemplates.first()
-        val showAge = prefs.specialDatesShowAge.first()
+        val showYear = prefs.specialDatesShowYear.first()
 
         calendarByType.forEach { (type, calendarId) ->
             val template = templates[type]?.takeIf { it.isNotBlank() }
@@ -81,9 +78,8 @@ class SpecialDatesSyncEngine @Inject constructor(
                 calendarId = calendarId,
                 type = type,
                 contactsOfType = desiredByType[type].orEmpty(),
-                today = today,
                 template = template,
-                showAge = showAge,
+                showYear = showYear,
                 reminderCtx = reminderCtx,
             )
         }
@@ -165,13 +161,12 @@ class SpecialDatesSyncEngine @Inject constructor(
         calendarId: Long,
         type: SpecialDateType,
         contactsOfType: List<ContactSpecialDate>,
-        today: LocalDate,
         template: String,
-        showAge: Boolean,
+        showYear: Boolean,
         reminderCtx: ReminderContext,
     ) {
         val built = contactsOfType.map { sd ->
-            buildManagedEvent(calendarId, type, sd, today, template, showAge, reminderCtx)
+            buildManagedEvent(calendarId, type, sd, template, showYear, reminderCtx)
         }
         val diff = diffManagedEvents(built.map { it.desired }, calendars.queryManagedEvents(calendarId))
         val formByUid = built.associate { it.desired.uid to it.form }
@@ -186,15 +181,15 @@ class SpecialDatesSyncEngine @Inject constructor(
         calendarId: Long,
         type: SpecialDateType,
         sd: ContactSpecialDate,
-        today: LocalDate,
         template: String,
-        showAge: Boolean,
+        showYear: Boolean,
         reminderCtx: ReminderContext,
     ): BuiltManagedEvent {
         val anchor = sd.anchorDate()
         val start = LocalDateTime(anchor, LocalTime(0, 0))
-        val age = if (showAge) sd.ageAtNextOccurrence(today) else null
-        val title = renderSpecialDateTitle(template, sd.displayName, age)
+        // The source year is static and correct on every occurrence (unlike age).
+        val year = if (showYear) sd.year else null
+        val title = renderSpecialDateTitle(template, sd.displayName, year)
         val form = EventForm(
             calendarId = calendarId,
             title = title,

app/src/main/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefs.kt

@@ -476,11 +476,11 @@ class SettingsPrefs @Inject constructor(
         store.edit { it[titleTemplateKey(type)] = template }
     }
 
-    /** Whether `{age}` resolves in the title (only meaningful when the year is known). Default ON. */
-    val specialDatesShowAge: Flow<Boolean> = store.data.map { it[SPECIAL_DATES_SHOW_AGE_KEY] ?: true }
+    /** Whether `{year}` resolves in the title (only meaningful when the year is known). Default ON. */
+    val specialDatesShowYear: Flow<Boolean> = store.data.map { it[SPECIAL_DATES_SHOW_YEAR_KEY] ?: true }
 
-    suspend fun setSpecialDatesShowAge(enabled: Boolean) {
-        store.edit { it[SPECIAL_DATES_SHOW_AGE_KEY] = enabled }
+    suspend fun setSpecialDatesShowYear(enabled: Boolean) {
+        store.edit { it[SPECIAL_DATES_SHOW_YEAR_KEY] = enabled }
     }
 
     /** Outcome of the last mirror sync, for the settings status line. */
@@ -571,7 +571,7 @@ class SettingsPrefs @Inject constructor(
         const val MIN_BACKUP_INTERVAL = 30L
 
         internal val SPECIAL_DATES_ENABLED_KEY = booleanPreferencesKey("special_dates_enabled")
-        internal val SPECIAL_DATES_SHOW_AGE_KEY = booleanPreferencesKey("special_dates_show_age")
+        internal val SPECIAL_DATES_SHOW_YEAR_KEY = booleanPreferencesKey("special_dates_show_year")
         internal val SPECIAL_DATES_LAST_RUN_KEY = longPreferencesKey("special_dates_last_run")
         internal val SPECIAL_DATES_STALLED_KEY = stringPreferencesKey("special_dates_stalled_reason")
         internal val SPECIAL_DATES_LAST_FG_SYNC_KEY =

app/src/main/java/de/jeanlucmakiola/calendula/domain/contacts/SpecialDateFormatting.kt

@@ -1,7 +1,6 @@
 package de.jeanlucmakiola.calendula.domain.contacts
 
 import kotlinx.datetime.LocalDate
-import kotlinx.datetime.number
 
 /**
  * The deterministic `Events.UID_2445` that ties a mirrored event to its source
@@ -21,30 +20,18 @@ fun ContactSpecialDate.anchorDate(): LocalDate =
     LocalDate(year ?: YEARLESS_ANCHOR_YEAR, month, day)
 
 /**
- * The age the contact reaches on the *upcoming* occurrence of this date,
- * relative to [today], or null when the year is unknown. Because a
- * `FREQ=YEARLY` event carries a single static title, this is a snapshot taken
- * at sync time (refreshed on the next sync), not a per-occurrence value.
- */
-fun ContactSpecialDate.ageAtNextOccurrence(today: LocalDate): Int? {
-    val birthYear = year ?: return null
-    val monthDayPassedThisYear = month < today.month.number ||
-        (month == today.month.number && day < today.day)
-    val nextYear = if (monthDayPassedThisYear) today.year + 1 else today.year
-    return nextYear - birthYear
-}
-
-/**
- * Render a title [template] for a contact, substituting `{name}` and `{age}`
- * (the latter empty when [age] is null). Collapses the whitespace the empty
- * `{age}` may leave behind, so "{name}'s birthday ({age})" degrades cleanly to
+ * Render a title [template] for a contact, substituting `{name}` and `{year}`
+ * (the source year — a birthday's birth year or an anniversary's start year;
+ * empty when [year] is null). Unlike an age, the year is static and correct on
+ * every occurrence of the yearly event. Collapses the whitespace an empty
+ * `{year}` may leave behind, so "{name}'s birthday ({year})" degrades cleanly to
  * "Jane's birthday" when no year is known.
  */
-fun renderSpecialDateTitle(template: String, name: String, age: Int?): String =
+fun renderSpecialDateTitle(template: String, name: String, year: Int?): String =
     template
         .replace("{name}", name)
-        .replace("{age}", age?.toString().orEmpty())
-        // Drop an empty "()" left by an unresolved {age}, then tidy spacing.
+        .replace("{year}", year?.toString().orEmpty())
+        // Drop an empty "()" left by an unresolved {year}, then tidy spacing.
         .replace(Regex("""\(\s*\)"""), "")
         .replace(Regex("""\s+"""), " ")
         .trim()

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsScreen.kt

@@ -1186,16 +1186,16 @@ private fun SpecialDatesScreen(
 
             Spacer(Modifier.height(24.dp))
             GroupedRow(
-                title = stringResource(R.string.settings_special_dates_show_age),
-                summary = stringResource(R.string.settings_special_dates_show_age_hint),
+                title = stringResource(R.string.settings_special_dates_show_year),
+                summary = stringResource(R.string.settings_special_dates_show_year_hint),
                 position = Position.Top,
                 trailing = {
                     Switch(
-                        checked = state.showAge,
-                        onCheckedChange = viewModel::setSpecialDatesShowAge,
+                        checked = state.showYear,
+                        onCheckedChange = viewModel::setSpecialDatesShowYear,
                     )
                 },
-                onClick = { viewModel.setSpecialDatesShowAge(!state.showAge) },
+                onClick = { viewModel.setSpecialDatesShowYear(!state.showYear) },
             )
             GroupedRow(
                 title = stringResource(R.string.settings_special_dates_sync_now),
@@ -1302,16 +1302,6 @@ private fun SpecialDatesTemplateDialog(
                     style = MaterialTheme.typography.bodySmall,
                     color = MaterialTheme.colorScheme.onSurfaceVariant,
                 )
-                // Only warn about {age}'s snapshot behaviour once the user has
-                // actually put it in the template.
-                if (text.contains("{age}")) {
-                    Spacer(Modifier.height(8.dp))
-                    Text(
-                        text = stringResource(R.string.settings_special_dates_template_age_note),
-                        style = MaterialTheme.typography.bodySmall,
-                        color = MaterialTheme.colorScheme.tertiary,
-                    )
-                }
             }
         },
         confirmButton = {

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsUiState.kt

@@ -91,7 +91,8 @@ data class SpecialDatesUiState(
     val titleTemplates: Map<SpecialDateType, String> = emptyMap(),
     /** The reminder choice per type's managed calendar (applied to all its events). */
     val reminderChoices: Map<SpecialDateType, CalendarReminderOverride> = emptyMap(),
-    val showAge: Boolean = true,
+    /** Whether {year} resolves in titles (the source year is static and always correct). */
+    val showYear: Boolean = true,
     /** True when READ_CONTACTS was revoked after enabling — the mirror is paused. */
     val stalledPermission: Boolean = false,
     /** Epoch millis of the last sync, or 0 if it has never run. */

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsViewModel.kt

@@ -186,9 +186,9 @@ class SettingsViewModel @Inject constructor(
             prefs.specialDatesEnabled,
             prefs.specialDatesTypes,
             prefs.specialDatesTitleTemplates,
-            prefs.specialDatesShowAge,
+            prefs.specialDatesShowYear,
             prefs.specialDatesStatus,
-        ) { enabled, types, templates, showAge, status ->
+        ) { enabled, types, templates, showYear, status ->
             SpecialDatesUiState(
                 enabled = enabled,
                 types = types,
@@ -198,7 +198,7 @@ class SettingsViewModel @Inject constructor(
                     templates[type]?.takeIf { it.isNotBlank() }
                         ?: specialDatesSpec.defaultTitleTemplate(type)
                 },
-                showAge = showAge,
+                showYear = showYear,
                 stalledPermission = status.stalled == SpecialDatesStalledReason.PermissionRevoked,
                 lastRun = status.lastRun,
             )
@@ -256,9 +256,9 @@ class SettingsViewModel @Inject constructor(
         }
     }
 
-    fun setSpecialDatesShowAge(enabled: Boolean) {
+    fun setSpecialDatesShowYear(enabled: Boolean) {
         viewModelScope.launch {
-            prefs.setSpecialDatesShowAge(enabled)
+            prefs.setSpecialDatesShowYear(enabled)
             SpecialDatesScheduler.runNow(appContext)
         }
     }

app/src/main/res/values-de/strings.xml

@@ -415,8 +415,8 @@
     <string name="special_dates_calendar_birthday">Geburtstage</string>
     <string name="special_dates_calendar_anniversary">Jahrestage</string>
     <string name="special_dates_calendar_custom">Besondere Tage</string>
-    <string name="special_dates_default_title_birthday">{name}s Geburtstag</string>
-    <string name="special_dates_default_title_anniversary">{name}s Jahrestag</string>
+    <string name="special_dates_default_title_birthday">{name}s Geburtstag ({year})</string>
+    <string name="special_dates_default_title_anniversary">{name}s Jahrestag ({year})</string>
     <string name="special_dates_default_title_custom">{name}</string>
     <string name="event_edit_managed_hint">Verwaltet von „%1$s“ — Titel, Datum und Wiederholung werden aus deinen Kontakten synchron gehalten. Erinnerungen, Ort und Notizen kannst du selbst bearbeiten.</string>
     <string name="settings_special_dates_subtitle">Geburtstage &amp; Jahrestage aus Kontakten</string>
@@ -427,11 +427,10 @@
     <string name="settings_special_dates_type_anniversary">Jahrestage</string>
     <string name="settings_special_dates_type_custom">Weitere Tage</string>
     <string name="settings_special_dates_template">Titelformat</string>
-    <string name="settings_special_dates_template_hint">Verwende {name} für den Kontakt und {age} für das Alter (ausgeblendet, wenn das Jahr unbekannt ist).</string>
-    <string name="settings_special_dates_template_age_note">Hinweis: Das Alter ist ein einzelner Wert vom letzten Sync — es wird nicht für jedes Jahr aktualisiert. Jeder jährliche Termin zeigt daher dieselbe Zahl, was bei weiter zurück- oder vorausliegenden Terminen falsch sein kann.</string>
+    <string name="settings_special_dates_template_hint">Verwende {name} für den Kontakt und {year} für das Jahr (Geburtsjahr bzw. Startjahr eines Jahrestags; ausgeblendet, wenn unbekannt).</string>
     <string name="settings_special_dates_reminders">Erinnerungen</string>
-    <string name="settings_special_dates_show_age">Alter anzeigen</string>
-    <string name="settings_special_dates_show_age_hint">{age} in Titeln anzeigen, wenn das Geburtsjahr bekannt ist</string>
+    <string name="settings_special_dates_show_year">Jahr anzeigen</string>
+    <string name="settings_special_dates_show_year_hint">{year} in Titeln anzeigen, wenn es bekannt ist</string>
     <string name="settings_special_dates_sync_now">Jetzt synchronisieren</string>
     <string name="settings_special_dates_never_synced">Noch nicht synchronisiert</string>
     <string name="settings_special_dates_last_synced">Zuletzt synchronisiert %1$s</string>

app/src/main/res/values/strings.xml

@@ -356,11 +356,10 @@
     <string name="settings_special_dates_type_anniversary">Anniversaries</string>
     <string name="settings_special_dates_type_custom">Other dates</string>
     <string name="settings_special_dates_template">Title format</string>
-    <string name="settings_special_dates_template_hint">Use {name} for the contact and {age} for their age (hidden when the year is unknown).</string>
-    <string name="settings_special_dates_template_age_note">Note: the age is a single value set at the last sync — it isn\'t updated for each year, so every yearly occurrence shows the same number and it can be wrong for dates further in the past or future.</string>
+    <string name="settings_special_dates_template_hint">Use {name} for the contact and {year} for the year (the birth year, or an anniversary\'s start year; hidden when unknown).</string>
     <string name="settings_special_dates_reminders">Reminders</string>
-    <string name="settings_special_dates_show_age">Show age</string>
-    <string name="settings_special_dates_show_age_hint">Include {age} in titles when the birth year is known</string>
+    <string name="settings_special_dates_show_year">Show year</string>
+    <string name="settings_special_dates_show_year_hint">Include {year} in titles when it is known</string>
     <string name="settings_special_dates_sync_now">Sync now</string>
     <string name="settings_special_dates_never_synced">Not synced yet</string>
     <!-- %1$s is a relative time, e.g. "5 minutes ago". -->
@@ -500,7 +499,7 @@
     <string name="special_dates_calendar_birthday">Birthdays</string>
     <string name="special_dates_calendar_anniversary">Anniversaries</string>
     <string name="special_dates_calendar_custom">Special dates</string>
-    <string name="special_dates_default_title_birthday">{name}\'s birthday</string>
-    <string name="special_dates_default_title_anniversary">{name}\'s anniversary</string>
+    <string name="special_dates_default_title_birthday">{name}\'s birthday ({year})</string>
+    <string name="special_dates_default_title_anniversary">{name}\'s anniversary ({year})</string>
     <string name="special_dates_default_title_custom">{name}</string>
 </resources>

app/src/test/java/de/jeanlucmakiola/calendula/data/contacts/SpecialDatesSyncEngineTest.kt

@@ -13,15 +13,12 @@ import de.jeanlucmakiola.calendula.domain.contacts.ContactSpecialDate
 import de.jeanlucmakiola.calendula.domain.contacts.SpecialDateType
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.test.runTest
-import kotlinx.datetime.LocalDate
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.io.TempDir
 import java.nio.file.Path
 
 class SpecialDatesSyncEngineTest {
 
-    private val today = LocalDate(2026, 3, 1)
-
     private class FakeContacts(
         var permission: Boolean = true,
         var dates: List<ContactSpecialDate> = emptyList(),
@@ -34,7 +31,7 @@ class SpecialDatesSyncEngineTest {
         override fun displayName(type: SpecialDateType) = type.name
         override fun color(type: SpecialDateType) = 0xFF112233.toInt()
         override fun defaultTitleTemplate(type: SpecialDateType) = when (type) {
-            SpecialDateType.Birthday -> "{name}'s birthday ({age})"
+            SpecialDateType.Birthday -> "{name}'s birthday ({year})"
             SpecialDateType.Anniversary -> "{name}'s anniversary"
             SpecialDateType.Custom -> "{name}"
         }
@@ -65,7 +62,7 @@ class SpecialDatesSyncEngineTest {
     fun `disabled feature is a no-op`(@TempDir tempDir: Path) = runTest {
         val calendars = FakeCalendarDataSource()
         val (engine, _) = engineWith(tempDir, FakeContacts(), calendars, enabled = false)
-        assertThat(engine.sync(today)).isEqualTo(SpecialDatesSyncResult.Disabled)
+        assertThat(engine.sync()).isEqualTo(SpecialDatesSyncResult.Disabled)
         assertThat(calendars.createdManagedCalendars).isEmpty()
     }
 
@@ -73,7 +70,7 @@ class SpecialDatesSyncEngineTest {
     fun `missing permission reports stalled without touching calendars`(@TempDir tempDir: Path) = runTest {
         val calendars = FakeCalendarDataSource()
         val (engine, _) = engineWith(tempDir, FakeContacts(permission = false), calendars)
-        assertThat(engine.sync(today)).isEqualTo(SpecialDatesSyncResult.PermissionMissing)
+        assertThat(engine.sync()).isEqualTo(SpecialDatesSyncResult.PermissionMissing)
         assertThat(calendars.createdManagedCalendars).isEmpty()
     }
 
@@ -88,16 +85,16 @@ class SpecialDatesSyncEngineTest {
         )
         val (engine, settings) = engineWith(tempDir, contacts, calendars)
 
-        assertThat(engine.sync(today)).isEqualTo(SpecialDatesSyncResult.Success)
+        assertThat(engine.sync()).isEqualTo(SpecialDatesSyncResult.Success)
         // All three type calendars exist; the birthday one holds both contacts.
         assertThat(calendars.createdManagedCalendars.map { it.type })
             .containsExactlyElementsIn(SpecialDateType.entries)
         assertThat(calendars.insertedManagedEvents).hasSize(2)
         assertThat(calendars.insertedManagedEvents.map { it.second })
             .containsExactly("contact-birthday:a@calendula", "contact-birthday:b@calendula")
-        // Year-less contact drops the age; year-known keeps it.
+        // Year-less contact drops the year; year-known keeps it.
         val titles = calendars.insertedManagedEvents.map { it.first.title }
-        assertThat(titles).contains("Jane's birthday (36)")
+        assertThat(titles).contains("Jane's birthday (1990)")
         assertThat(titles).contains("Bob's birthday")
         // Calendar ids were persisted for the editor / next sync.
         assertThat(settings.specialDatesCalendars.first()).containsKey(SpecialDateType.Birthday)
@@ -109,10 +106,10 @@ class SpecialDatesSyncEngineTest {
         val contacts = FakeContacts(dates = listOf(birthday("a", "Jane", 5, 14, 1990)))
         val (engine, _) = engineWith(tempDir, contacts, calendars)
 
-        engine.sync(today)
+        engine.sync()
         val insertsAfterFirst = calendars.insertedManagedEvents.size
         val calendarsAfterFirst = calendars.createdManagedCalendars.size
-        engine.sync(today)
+        engine.sync()
 
         assertThat(calendars.insertedManagedEvents).hasSize(insertsAfterFirst)
         assertThat(calendars.createdManagedCalendars).hasSize(calendarsAfterFirst)
@@ -125,16 +122,16 @@ class SpecialDatesSyncEngineTest {
         val calendars = FakeCalendarDataSource()
         val contacts = FakeContacts(dates = listOf(birthday("a", "Jane", 5, 14, 1990)))
         val (engine, _) = engineWith(tempDir, contacts, calendars)
-        engine.sync(today)
+        engine.sync()
 
         contacts.dates = listOf(birthday("a", "Janet", 5, 14, 1990))
-        engine.sync(today)
+        engine.sync()
 
         assertThat(calendars.updatedManagedFields).hasSize(1)
         val (_, columns) = calendars.updatedManagedFields.single()
         // Only managed columns are ever written — never reminders/location.
         assertThat(columns.keys).containsExactly(CalendarContract.Events.TITLE)
-        assertThat(columns[CalendarContract.Events.TITLE]).isEqualTo("Janet's birthday (36)")
+        assertThat(columns[CalendarContract.Events.TITLE]).isEqualTo("Janet's birthday (1990)")
     }
 
     @Test
@@ -142,10 +139,10 @@ class SpecialDatesSyncEngineTest {
         val calendars = FakeCalendarDataSource()
         val contacts = FakeContacts(dates = listOf(birthday("a", "Jane", 5, 14, 1990)))
         val (engine, _) = engineWith(tempDir, contacts, calendars)
-        engine.sync(today)
+        engine.sync()
 
         contacts.dates = emptyList()
-        engine.sync(today)
+        engine.sync()
 
         assertThat(calendars.deletedEventIds).hasSize(1)
     }
@@ -154,11 +151,11 @@ class SpecialDatesSyncEngineTest {
     fun `disabling a type deletes its calendar on the next sync`(@TempDir tempDir: Path) = runTest {
         val calendars = FakeCalendarDataSource()
         val (engine, settings) = engineWith(tempDir, FakeContacts(), calendars)
-        engine.sync(today)
+        engine.sync()
         val anniversaryId = settings.specialDatesCalendars.first().getValue(SpecialDateType.Anniversary)
 
         settings.setSpecialDateTypeEnabled(SpecialDateType.Anniversary, false)
-        engine.sync(today)
+        engine.sync()
 
         assertThat(calendars.deletedCalendarIds).contains(anniversaryId)
         assertThat(settings.specialDatesCalendars.first()).doesNotContainKey(SpecialDateType.Anniversary)
@@ -169,7 +166,7 @@ class SpecialDatesSyncEngineTest {
         val calendars = FakeCalendarDataSource()
         val contacts = FakeContacts(dates = listOf(birthday("a", "Jane", 5, 14, 1990)))
         val (engine, settings) = engineWith(tempDir, contacts, calendars)
-        engine.sync(today)
+        engine.sync()
         val birthdayCal = settings.specialDatesCalendars.first().getValue(SpecialDateType.Birthday)
 
         engine.applyReminders(SpecialDateType.Birthday, CalendarReminderOverride.Minutes(listOf(0, 1440)))
@@ -187,7 +184,7 @@ class SpecialDatesSyncEngineTest {
     fun `applyReminders with None clears the reminders`(@TempDir tempDir: Path) = runTest {
         val calendars = FakeCalendarDataSource()
         val (engine, settings) = engineWith(tempDir, FakeContacts(), calendars)
-        engine.sync(today)
+        engine.sync()
         val birthdayCal = settings.specialDatesCalendars.first().getValue(SpecialDateType.Birthday)
 
         engine.applyReminders(SpecialDateType.Birthday, CalendarReminderOverride.None)

app/src/test/java/de/jeanlucmakiola/calendula/data/prefs/SettingsPrefsTest.kt

@@ -349,7 +349,7 @@ class SettingsPrefsTest {
         assertThat(prefs.specialDatesTypes.first()).isEqualTo(SpecialDateType.entries.toSet())
         assertThat(prefs.specialDatesCalendars.first()).isEmpty()
         assertThat(prefs.managedCalendarIds.first()).isEmpty()
-        assertThat(prefs.specialDatesShowAge.first()).isTrue()
+        assertThat(prefs.specialDatesShowYear.first()).isTrue()
     }
 
     @Test

app/src/test/java/de/jeanlucmakiola/calendula/domain/contacts/SpecialDateFormattingTest.kt

@@ -34,36 +34,14 @@ class SpecialDateFormattingTest {
     }
 
     @Test
-    fun `age is null when the year is unknown`() {
-        assertThat(birthday(5, 14, null).ageAtNextOccurrence(LocalDate(2026, 1, 1))).isNull()
+    fun `title substitutes name and year`() {
+        assertThat(renderSpecialDateTitle("{name}'s birthday ({year})", "Jane", 1990))
+            .isEqualTo("Jane's birthday (1990)")
     }
 
     @Test
-    fun `age counts the upcoming birthday when it is still ahead this year`() {
-        // Born 1990-05-14; today 2026-03-01 → next birthday 2026 → turns 36.
-        assertThat(birthday(5, 14, 1990).ageAtNextOccurrence(LocalDate(2026, 3, 1))).isEqualTo(36)
-    }
-
-    @Test
-    fun `age rolls to next year once the birthday has passed`() {
-        // Born 1990-05-14; today 2026-06-01 → next birthday 2027 → turns 37.
-        assertThat(birthday(5, 14, 1990).ageAtNextOccurrence(LocalDate(2026, 6, 1))).isEqualTo(37)
-    }
-
-    @Test
-    fun `age counts today's birthday as this year`() {
-        assertThat(birthday(5, 14, 1990).ageAtNextOccurrence(LocalDate(2026, 5, 14))).isEqualTo(36)
-    }
-
-    @Test
-    fun `title substitutes name and age`() {
-        assertThat(renderSpecialDateTitle("{name}'s birthday ({age})", "Jane", 30))
-            .isEqualTo("Jane's birthday (30)")
-    }
-
-    @Test
-    fun `title drops an empty age parenthesis and tidies spacing`() {
-        assertThat(renderSpecialDateTitle("{name}'s birthday ({age})", "Jane", null))
+    fun `title drops an empty year parenthesis and tidies spacing`() {
+        assertThat(renderSpecialDateTitle("{name}'s birthday ({year})", "Jane", null))
             .isEqualTo("Jane's birthday")
     }
 }