diff --git a/app/src/main/java/eu/kanade/presentation/components/RelativeDateHeader.kt b/app/src/main/java/eu/kanade/presentation/components/RelativeDateHeader.kt
index 89bb61b4f7..598bad83e5 100644
--- a/app/src/main/java/eu/kanade/presentation/components/RelativeDateHeader.kt
+++ b/app/src/main/java/eu/kanade/presentation/components/RelativeDateHeader.kt
@@ -3,8 +3,6 @@ package eu.kanade.presentation.components
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.platform.LocalContext
-import eu.kanade.tachiyomi.util.lang.toRelativeString
 import tachiyomi.presentation.core.components.ListGroupHeader
 import java.text.DateFormat
 import java.util.Date
@@ -15,11 +13,10 @@ fun RelativeDateHeader(
     date: Date,
     dateFormat: DateFormat,
 ) {
-    val context = LocalContext.current
     ListGroupHeader(
         modifier = modifier,
         text = remember {
-            date.toRelativeString(context, dateFormat)
+            dateFormat.format(date)
         },
     )
 }
diff --git a/app/src/main/java/eu/kanade/presentation/manga/MangaScreen.kt b/app/src/main/java/eu/kanade/presentation/manga/MangaScreen.kt
index 740ece4a26..352e6aedb5 100644
--- a/app/src/main/java/eu/kanade/presentation/manga/MangaScreen.kt
+++ b/app/src/main/java/eu/kanade/presentation/manga/MangaScreen.kt
@@ -63,7 +63,6 @@ import eu.kanade.tachiyomi.data.download.model.Download
 import eu.kanade.tachiyomi.source.getNameForMangaInfo
 import eu.kanade.tachiyomi.ui.manga.ChapterItem
 import eu.kanade.tachiyomi.ui.manga.MangaScreenModel
-import eu.kanade.tachiyomi.util.lang.toRelativeString
 import eu.kanade.tachiyomi.util.system.copyToClipboard
 import tachiyomi.domain.chapter.model.Chapter
 import tachiyomi.domain.chapter.service.missingChaptersCount
@@ -740,7 +739,7 @@ private fun LazyListScope.sharedChapterItems(
             date = chapterItem.chapter.dateUpload
                 .takeIf { it > 0L }
                 ?.let {
-                    Date(it).toRelativeString(context, dateFormat)
+                    dateFormat.format(Date(it))
                 },
             readProgress = chapterItem.chapter.lastPageRead
                 .takeIf { !chapterItem.chapter.read && it > 0L }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/updates/UpdatesScreenModel.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/updates/UpdatesScreenModel.kt
index 6459d6525c..6e0c1c4742 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/updates/UpdatesScreenModel.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/updates/UpdatesScreenModel.kt
@@ -20,7 +20,6 @@ import eu.kanade.tachiyomi.data.download.DownloadManager
 import eu.kanade.tachiyomi.data.download.model.Download
 import eu.kanade.tachiyomi.data.library.LibraryUpdateJob
 import eu.kanade.tachiyomi.util.lang.toDateKey
-import eu.kanade.tachiyomi.util.lang.toRelativeString
 import kotlinx.coroutines.channels.Channel
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.catch
@@ -384,7 +383,7 @@ class UpdatesScreenModel(
                     val afterDate = after?.item?.update?.dateFetch?.toDateKey() ?: Date(0)
                     when {
                         beforeDate.time != afterDate.time && afterDate.time != 0L -> {
-                            val text = afterDate.toRelativeString(context, dateFormat)
+                            val text = dateFormat.format(afterDate)
                             UpdatesUiModel.Header(text)
                         }
                         // Return null to avoid adding a separator between two items.
diff --git a/app/src/main/java/eu/kanade/tachiyomi/util/lang/DateExtensions.kt b/app/src/main/java/eu/kanade/tachiyomi/util/lang/DateExtensions.kt
index 9efcaaa9fb..88477e8d57 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/util/lang/DateExtensions.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/util/lang/DateExtensions.kt
@@ -1,14 +1,11 @@
 package eu.kanade.tachiyomi.util.lang
 
-import android.content.Context
-import eu.kanade.tachiyomi.R
 import java.text.DateFormat
 import java.time.Instant
 import java.time.LocalDateTime
 import java.time.ZoneId
 import java.util.Calendar
 import java.util.Date
-import java.util.TimeZone
 
 fun Date.toDateTimestampString(dateFormatter: DateFormat): String {
     val date = dateFormatter.format(this)
@@ -45,101 +42,3 @@ fun Long.toDateKey(): Date {
     cal[Calendar.MILLISECOND] = 0
     return cal.time
 }
-
-/**
- * Convert epoch long to Calendar instance
- *
- * @return Calendar instance at supplied epoch time. Null if epoch was 0.
- */
-fun Long.toCalendar(): Calendar? {
-    if (this == 0L) {
-        return null
-    }
-    val cal = Calendar.getInstance()
-    cal.timeInMillis = this
-    return cal
-}
-
-/**
- * Convert local time millisecond value to Calendar instance in UTC
- *
- * @return UTC Calendar instance at supplied time. Null if time is 0.
- */
-fun Long.toUtcCalendar(): Calendar? {
-    if (this == 0L) {
-        return null
-    }
-    val rawCalendar = Calendar.getInstance().apply {
-        timeInMillis = this@toUtcCalendar
-    }
-    return Calendar.getInstance(TimeZone.getTimeZone("UTC")).apply {
-        clear()
-        set(
-            rawCalendar.get(Calendar.YEAR),
-            rawCalendar.get(Calendar.MONTH),
-            rawCalendar.get(Calendar.DAY_OF_MONTH),
-            rawCalendar.get(Calendar.HOUR_OF_DAY),
-            rawCalendar.get(Calendar.MINUTE),
-            rawCalendar.get(Calendar.SECOND),
-        )
-    }
-}
-
-/**
- * Convert UTC time millisecond to Calendar instance in local time zone
- *
- * @return local Calendar instance at supplied UTC time. Null if time is 0.
- */
-fun Long.toLocalCalendar(): Calendar? {
-    if (this == 0L) {
-        return null
-    }
-    val rawCalendar = Calendar.getInstance(TimeZone.getTimeZone("UTC")).apply {
-        timeInMillis = this@toLocalCalendar
-    }
-    return Calendar.getInstance().apply {
-        clear()
-        set(
-            rawCalendar.get(Calendar.YEAR),
-            rawCalendar.get(Calendar.MONTH),
-            rawCalendar.get(Calendar.DAY_OF_MONTH),
-            rawCalendar.get(Calendar.HOUR_OF_DAY),
-            rawCalendar.get(Calendar.MINUTE),
-            rawCalendar.get(Calendar.SECOND),
-        )
-    }
-}
-
-private const val MILLISECONDS_IN_DAY = 86_400_000L
-
-fun Date.toRelativeString(
-    context: Context,
-    dateFormat: DateFormat = DateFormat.getDateInstance(DateFormat.SHORT),
-): String {
-    val now = Date()
-    val difference = now.timeWithOffset.floorNearest(MILLISECONDS_IN_DAY) - this.timeWithOffset.floorNearest(MILLISECONDS_IN_DAY)
-    val days = difference.floorDiv(MILLISECONDS_IN_DAY).toInt()
-    return when {
-        difference < 0 -> dateFormat.format(this)
-        difference < MILLISECONDS_IN_DAY -> context.getString(R.string.relative_time_today)
-        difference < MILLISECONDS_IN_DAY.times(7) -> context.resources.getQuantityString(
-            R.plurals.relative_time,
-            days,
-            days,
-        )
-        else -> dateFormat.format(this)
-    }
-}
-
-private val Date.timeWithOffset: Long
-    get() {
-        return Calendar.getInstance().run {
-            time = this@timeWithOffset
-            val dstOffset = get(Calendar.DST_OFFSET)
-            this@timeWithOffset.time + timeZone.rawOffset + dstOffset
-        }
-    }
-
-fun Long.floorNearest(to: Long): Long {
-    return this.floorDiv(to) * to
-}
diff --git a/i18n/src/main/res/values/strings.xml b/i18n/src/main/res/values/strings.xml
index 35e9cb2752..67f33acca5 100644
--- a/i18n/src/main/res/values/strings.xml
+++ b/i18n/src/main/res/values/strings.xml
@@ -223,12 +223,6 @@
     <string name="pref_show_nsfw_source">Show in sources and extensions lists</string>
     <string name="parental_controls_info">This does not prevent unofficial or potentially incorrectly flagged extensions from surfacing NSFW (18+) content within the app.</string>
 
-    <string name="relative_time_today">Today</string>
-    <plurals name="relative_time">
-        <item quantity="one">Yesterday</item>
-        <item quantity="other">%1$d days ago</item>
-    </plurals>
-
       <!-- Library section -->
     <string name="pref_category_display">Display</string>
     <string name="pref_library_columns">Grid size</string>