diff --git a/app/src/main/java/org/wikipedia/notifications/NotificationActivity.kt b/app/src/main/java/org/wikipedia/notifications/NotificationActivity.kt
index 0d72dc3cb27..fdb4b5ea54f 100644
--- a/app/src/main/java/org/wikipedia/notifications/NotificationActivity.kt
+++ b/app/src/main/java/org/wikipedia/notifications/NotificationActivity.kt
@@ -7,7 +7,6 @@ import android.graphics.Typeface
 import android.graphics.drawable.Drawable
 import android.net.Uri
 import android.os.Bundle
-import android.text.format.DateUtils
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
@@ -50,6 +49,7 @@ import org.wikipedia.page.LinkMovementMethodExt
 import org.wikipedia.richtext.RichTextUtil
 import org.wikipedia.settings.NotificationSettingsActivity
 import org.wikipedia.settings.Prefs
+import org.wikipedia.util.DateUtil
 import org.wikipedia.util.DeviceUtil
 import org.wikipedia.util.DimenUtil
 import org.wikipedia.util.FeedbackUtil
@@ -64,6 +64,8 @@ import org.wikipedia.views.NotificationActionsOverflowView
 import org.wikipedia.views.SearchAndFilterActionProvider
 import org.wikipedia.views.SwipeableItemTouchHelperCallback
 import org.wikipedia.views.WikiCardView
+import kotlin.time.ExperimentalTime
+import kotlin.time.toJavaInstant
 
 class NotificationActivity : BaseActivity() {
     private lateinit var binding: ActivityNotificationsBinding
@@ -390,7 +392,8 @@ class NotificationActivity : BaseActivity() {
                 }
             }
 
-            binding.notificationTime.text = DateUtils.getRelativeTimeSpanString(n.date().time, System.currentTimeMillis(), 0L)
+            @OptIn(ExperimentalTime::class)
+            binding.notificationTime.text = DateUtil.formatRelativeTime(n.instant().toJavaInstant())
             binding.notificationTime.setTextColor(if (n.isUnread) primaryColor else inactiveColor)
             binding.notificationOverflowMenu.imageTintList = if (n.isUnread) primaryColor else inactiveColor
 
diff --git a/app/src/main/java/org/wikipedia/notifications/NotificationViewModel.kt b/app/src/main/java/org/wikipedia/notifications/NotificationViewModel.kt
index 2a999c3d11b..947d42b5d07 100644
--- a/app/src/main/java/org/wikipedia/notifications/NotificationViewModel.kt
+++ b/app/src/main/java/org/wikipedia/notifications/NotificationViewModel.kt
@@ -16,6 +16,7 @@ import org.wikipedia.util.Resource
 import org.wikipedia.util.StringUtil
 import java.util.Date
 import java.util.Random
+import kotlin.time.ExperimentalTime
 
 class NotificationViewModel : ViewModel() {
 
@@ -47,6 +48,7 @@ class NotificationViewModel : ViewModel() {
         _uiState.value = Resource.Success(pair)
     }
 
+    @OptIn(ExperimentalTime::class)
     private fun processList(list: List<Notification>): List<NotificationListItemContainer> {
         if (currentContinueStr.isNullOrEmpty()) {
             notificationList.clear()
@@ -57,7 +59,7 @@ class NotificationViewModel : ViewModel() {
             }
         }
         // Sort them by descending date...
-        notificationList.sortByDescending { it.date() }
+        notificationList.sortByDescending { it.instant() }
 
         // Filtered the tab selection
         val tabSelectedList = notificationList
diff --git a/app/src/main/java/org/wikipedia/notifications/PollNotificationWorker.kt b/app/src/main/java/org/wikipedia/notifications/PollNotificationWorker.kt
index 108a70e75a8..554d85d4f8a 100644
--- a/app/src/main/java/org/wikipedia/notifications/PollNotificationWorker.kt
+++ b/app/src/main/java/org/wikipedia/notifications/PollNotificationWorker.kt
@@ -14,15 +14,19 @@ import org.wikipedia.dataclient.WikiSite
 import org.wikipedia.dataclient.mwapi.MwException
 import org.wikipedia.settings.Prefs
 import org.wikipedia.util.log.L
+import kotlin.time.ExperimentalTime
+import kotlin.time.Instant
 
 class PollNotificationWorker(
     private val appContext: Context,
     params: WorkerParameters
 ) : CoroutineWorker(appContext, params) {
+    @OptIn(ExperimentalTime::class)
     override suspend fun doWork(): Result {
         return try {
             val response = ServiceFactory.get(WikipediaApp.instance.wikiSite).lastUnreadNotification()
-            val lastNotificationTime = response.query?.notifications?.list?.maxOfOrNull { it.utcIso8601 }.orEmpty()
+            val lastNotificationTime = response.query?.notifications?.list?.maxOfOrNull { it.instant() }
+                ?: Instant.DISTANT_PAST
             if (lastNotificationTime > Prefs.remoteNotificationsSeenTime) {
                 Prefs.remoteNotificationsSeenTime = lastNotificationTime
                 retrieveNotifications()
diff --git a/app/src/main/java/org/wikipedia/notifications/db/Notification.kt b/app/src/main/java/org/wikipedia/notifications/db/Notification.kt
index b9f54f59421..f1181e8684d 100644
--- a/app/src/main/java/org/wikipedia/notifications/db/Notification.kt
+++ b/app/src/main/java/org/wikipedia/notifications/db/Notification.kt
@@ -11,9 +11,10 @@ import org.wikipedia.Constants
 import org.wikipedia.dataclient.WikiSite
 import org.wikipedia.json.JsonUtil
 import org.wikipedia.page.Namespace
-import org.wikipedia.util.DateUtil
 import org.wikipedia.util.UriUtil
-import java.util.*
+import kotlin.time.Clock
+import kotlin.time.ExperimentalTime
+import kotlin.time.Instant
 
 @Serializable
 @Entity(primaryKeys = ["id", "wiki"])
@@ -28,9 +29,6 @@ class Notification(var id: Long = 0,
                    var timestamp: Timestamp? = null,
                    @SerialName("*") var contents: Contents? = null) {
 
-    val utcIso8601: String
-        get() = timestamp?.utciso8601.orEmpty()
-
     val isFromWikidata: Boolean
         get() = wiki == Constants.WIKIDATA_DB_NAME
 
@@ -40,8 +38,9 @@ class Notification(var id: Long = 0,
         return id + wiki.hashCode()
     }
 
-    fun date(): Date {
-        return timestamp?.date() ?: Date()
+    @OptIn(ExperimentalTime::class)
+    fun instant(): Instant {
+        return timestamp?.instant ?: Clock.System.now()
     }
 
     override fun toString(): String {
@@ -69,14 +68,8 @@ class Notification(var id: Long = 0,
     }
 
     @Serializable
-    class Timestamp {
-
-        val utciso8601: String? = null
-
-        fun date(): Date {
-            return DateUtil.iso8601DateParse(utciso8601!!)
-        }
-    }
+    @OptIn(ExperimentalTime::class)
+    class Timestamp(@SerialName("utciso8601") val instant: Instant)
 
     @Serializable
     class Link {
diff --git a/app/src/main/java/org/wikipedia/settings/Prefs.kt b/app/src/main/java/org/wikipedia/settings/Prefs.kt
index d8d17369bf1..a42bdb35644 100644
--- a/app/src/main/java/org/wikipedia/settings/Prefs.kt
+++ b/app/src/main/java/org/wikipedia/settings/Prefs.kt
@@ -28,6 +28,8 @@ import org.wikipedia.util.ReleaseUtil.isDevRelease
 import org.wikipedia.util.StringUtil
 import org.wikipedia.watchlist.WatchlistFilterTypes
 import java.util.Date
+import kotlin.time.ExperimentalTime
+import kotlin.time.Instant
 
 /** Shared preferences utility for convenient POJO access.  */
 object Prefs {
@@ -373,9 +375,13 @@ object Prefs {
         get() = PrefsIoUtil.getBoolean(R.string.preference_key_reading_lists_first_time_sync, true)
         set(value) = PrefsIoUtil.setBoolean(R.string.preference_key_reading_lists_first_time_sync, value)
 
-    var remoteNotificationsSeenTime
-        get() = PrefsIoUtil.getString(R.string.preference_key_remote_notifications_seen_time, "").orEmpty()
-        set(seenTime) = PrefsIoUtil.setString(R.string.preference_key_remote_notifications_seen_time, seenTime)
+    @OptIn(ExperimentalTime::class)
+    var remoteNotificationsSeenTime: Instant
+        get() {
+            val timestamp = PrefsIoUtil.getString(R.string.preference_key_remote_notifications_seen_time, "")!!
+            return Instant.parseOrNull(timestamp) ?: Instant.DISTANT_PAST
+        }
+        set(seenTime) = PrefsIoUtil.setString(R.string.preference_key_remote_notifications_seen_time, seenTime.toString())
 
     var showHistoryOfflineArticlesToast
         get() = PrefsIoUtil.getBoolean(R.string.preference_key_history_offline_articles_toast, true)
diff --git a/app/src/main/java/org/wikipedia/util/DateUtil.kt b/app/src/main/java/org/wikipedia/util/DateUtil.kt
index cb32ceb6d51..c5538dc3cb3 100644
--- a/app/src/main/java/org/wikipedia/util/DateUtil.kt
+++ b/app/src/main/java/org/wikipedia/util/DateUtil.kt
@@ -4,6 +4,7 @@ import android.content.Context
 import android.icu.text.RelativeDateTimeFormatter
 import android.os.Build
 import android.text.format.DateFormat
+import android.text.format.DateUtils
 import org.wikipedia.R
 import org.wikipedia.WikipediaApp
 import org.wikipedia.extensions.getResources
@@ -15,9 +16,9 @@ import java.time.LocalDate
 import java.time.LocalDateTime
 import java.time.ZoneId
 import java.time.ZoneOffset
-import java.time.ZonedDateTime
 import java.time.format.DateTimeFormatter
 import java.time.format.FormatStyle
+import java.time.temporal.ChronoUnit
 import java.time.temporal.TemporalAccessor
 import java.util.Calendar
 import java.util.Date
@@ -189,18 +190,10 @@ object DateUtil {
         }
     }
 
-    fun startOfYearInMillis(year: Int, zoneId: ZoneId = ZoneId.systemDefault()): Long {
-        val localDate = LocalDate.of(year, 1, 1)
-        return localDate.atStartOfDay(zoneId).toInstant().toEpochMilli()
-    }
-
-    fun endOfYearInMillis(year: Int, zoneId: ZoneId = ZoneId.systemDefault()): Long {
-        val localDate = LocalDate.of(year, 12, 31)
-        return localDate.atTime(0, 0, 0).atZone(zoneId).toInstant().toEpochMilli()
-    }
-
-    fun epochMilliToYear(epochMilli: Long, zoneId: ZoneId = ZoneId.systemDefault()): Int {
-        val zonedDateTime = ZonedDateTime.ofInstant(Instant.ofEpochMilli(epochMilli), zoneId)
-        return zonedDateTime.year
+    fun formatRelativeTime(instant: Instant): CharSequence {
+        val localDate = LocalDate.ofInstant(instant, ZoneId.systemDefault())
+        val weeks = localDate.until(LocalDate.now(), ChronoUnit.WEEKS)
+        val minResolution = if (weeks in 1..10) DateUtils.WEEK_IN_MILLIS else 0L
+        return DateUtils.getRelativeTimeSpanString(instant.toEpochMilli(), System.currentTimeMillis(), minResolution)
     }
 }
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index 37d1b6574fd..350a0b407eb 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -50,7 +50,6 @@ composeBom = "2025.07.00"
 composeActivity = "1.10.1"
 composeViewModel = "2.9.2"
 
-
 [libraries]
 android-sdk = { module = "org.maplibre.gl:android-sdk", version.ref = "androidSdk" }
 android-plugin-annotation-v9 = { module = "org.maplibre.gl:android-plugin-annotation-v9", version.ref = "androidPluginAnnotationV9" }
@@ -88,8 +87,6 @@ hamcrest = { module = "org.hamcrest:hamcrest", version.ref = "hamcrest" }
 installreferrer = { module = "com.android.installreferrer:installreferrer", version.ref = "installreferrer" }
 jsoup = { module = "org.jsoup:jsoup", version.ref = "jsoup" }
 junit = { module = "junit:junit", version.ref = "junit" }
-kotlin-gradle-plugin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlinStdlibJdk8" }
-kotlin-serialization = { module = "org.jetbrains.kotlin:kotlin-serialization", version.ref = "kotlinStdlibJdk8" }
 kotlin-stdlib-jdk8 = { module = "org.jetbrains.kotlin:kotlin-stdlib-jdk8", version.ref = "kotlinStdlibJdk8" }
 kotlinx-coroutines-android = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-android", version.ref = "kotlinCoroutinesVersion" }
 kotlinx-coroutines-core = { module = "org.jetbrains.kotlinx:kotlinx-coroutines-core", version.ref = "kotlinCoroutinesVersion" }