diff --git a/app/build.gradle b/app/build.gradle
index fe93d40a9..cc80b8c87 100755
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -303,6 +303,13 @@ dependencies {
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-reactive:$coroutines_version"
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-rx2:$coroutines_version"
 
+    // For detecting memory leaks; see https://square.github.io/leakcanary/
+//    debugImplementation 'com.squareup.leakcanary:leakcanary-android:2.2'
+
+    // Debug tool; see https://fbflipper.com/
+//    debugImplementation 'com.facebook.flipper:flipper:0.49.0'
+//    debugImplementation 'com.facebook.soloader:soloader:0.9.0'
+    
     // Text distance (EH)
     implementation 'info.debatty:java-string-similarity:1.2.1'
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/App.kt b/app/src/main/java/eu/kanade/tachiyomi/App.kt
index a12c169ec..2aa30bd67 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/App.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/App.kt
@@ -63,6 +63,15 @@ open class App : Application(), LifecycleObserver {
 
         workaroundAndroid7BrokenSSL()
 
+        // Debug tool; see https://fbflipper.com/
+        // SoLoader.init(this, false)
+        // if (BuildConfig.DEBUG && FlipperUtils.shouldEnableFlipper(this)) {
+        //     val client = AndroidFlipperClient.getInstance(this)
+        //     client.addPlugin(InspectorFlipperPlugin(this, DescriptorMapping.withDefaults()))
+        //     client.addPlugin(DatabasesFlipperPlugin(this))
+        //     client.start()
+        // }
+
         // Enforce WebView availability
         if (!WebViewUtil.supportsWebView(this)) {
             toast(R.string.information_webview_required, Toast.LENGTH_LONG)
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/DbOpenCallback.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/DbOpenCallback.kt
index 6c4ef1d4a..ac23c294f 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/data/database/DbOpenCallback.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/DbOpenCallback.kt
@@ -24,7 +24,7 @@ class DbOpenCallback : SupportSQLiteOpenHelper.Callback(DATABASE_VERSION) {
         /**
          * Version of the database.
          */
-        const val DATABASE_VERSION = /* SY --> */ 2 /* SY <-- */
+        const val DATABASE_VERSION = /* SY --> */ 3 /* SY <-- */
     }
 
     override fun onCreate(db: SupportSQLiteDatabase) = with(db) {
@@ -66,6 +66,10 @@ class DbOpenCallback : SupportSQLiteOpenHelper.Callback(DATABASE_VERSION) {
         if (oldVersion < 2) {
             db.execSQL(MangaTable.addCoverLastModified)
         }
+        if (oldVersion < 3) {
+            db.execSQL(MangaTable.addDateAdded)
+            db.execSQL(MangaTable.backfillDateAdded)
+        }
     }
 
     override fun onConfigure(db: SupportSQLiteDatabase) {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/mappers/MangaTypeMapping.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/mappers/MangaTypeMapping.kt
index 72e078e03..98be1de12 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/data/database/mappers/MangaTypeMapping.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/mappers/MangaTypeMapping.kt
@@ -15,6 +15,7 @@ import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_ARTIST
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_AUTHOR
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_CHAPTER_FLAGS
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_COVER_LAST_MODIFIED
+import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_DATE_ADDED
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_DESCRIPTION
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_FAVORITE
 import eu.kanade.tachiyomi.data.database.tables.MangaTable.COL_GENRE
@@ -47,7 +48,7 @@ class MangaPutResolver : DefaultPutResolver<Manga>() {
         .whereArgs(obj.id)
         .build()
 
-    override fun mapToContentValues(obj: Manga) = ContentValues(15).apply {
+    override fun mapToContentValues(obj: Manga) = ContentValues(17).apply {
         put(COL_ID, obj.id)
         put(COL_SOURCE, obj.source)
         put(COL_URL, obj.url)
@@ -64,6 +65,7 @@ class MangaPutResolver : DefaultPutResolver<Manga>() {
         put(COL_VIEWER, obj.viewer)
         put(COL_CHAPTER_FLAGS, obj.chapter_flags)
         put(COL_COVER_LAST_MODIFIED, obj.cover_last_modified)
+        put(COL_DATE_ADDED, obj.date_added)
     }
 }
 
@@ -85,6 +87,7 @@ interface BaseMangaGetResolver {
         viewer = cursor.getInt(cursor.getColumnIndex(COL_VIEWER))
         chapter_flags = cursor.getInt(cursor.getColumnIndex(COL_CHAPTER_FLAGS))
         cover_last_modified = cursor.getLong(cursor.getColumnIndex(COL_COVER_LAST_MODIFIED))
+        date_added = cursor.getLong(cursor.getColumnIndex(COL_DATE_ADDED))
     }
 }
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/models/Manga.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/models/Manga.kt
index fe3c074d5..07ae1ab3e 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/data/database/models/Manga.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/models/Manga.kt
@@ -12,6 +12,8 @@ interface Manga : SManga {
 
     var last_update: Long
 
+    var date_added: Long
+
     var viewer: Int
 
     var chapter_flags: Int
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/models/MangaImpl.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/models/MangaImpl.kt
index 6d835522d..f8502d117 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/data/database/models/MangaImpl.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/models/MangaImpl.kt
@@ -48,6 +48,8 @@ open class MangaImpl : Manga {
 
     override var last_update: Long = 0
 
+    override var date_added: Long = 0
+
     override var initialized: Boolean = false
 
     override var viewer: Int = 0
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/database/tables/MangaTable.kt b/app/src/main/java/eu/kanade/tachiyomi/data/database/tables/MangaTable.kt
index 1004340b2..bd6f79f4f 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/data/database/tables/MangaTable.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/database/tables/MangaTable.kt
@@ -28,6 +28,8 @@ object MangaTable {
 
     const val COL_LAST_UPDATE = "last_update"
 
+    const val COL_DATE_ADDED = "date_added"
+
     const val COL_INITIALIZED = "initialized"
 
     const val COL_VIEWER = "viewer"
@@ -58,7 +60,8 @@ object MangaTable {
             $COL_INITIALIZED BOOLEAN NOT NULL,
             $COL_VIEWER INTEGER NOT NULL,
             $COL_CHAPTER_FLAGS INTEGER NOT NULL,
-            $COL_COVER_LAST_MODIFIED LONG NOT NULL
+            $COL_COVER_LAST_MODIFIED LONG NOT NULL,
+            $COL_DATE_ADDED LONG NOT NULL
             )"""
 
     val createUrlIndexQuery: String
@@ -70,4 +73,17 @@ object MangaTable {
 
     val addCoverLastModified: String
         get() = "ALTER TABLE $TABLE ADD COLUMN $COL_COVER_LAST_MODIFIED LONG NOT NULL DEFAULT 0"
+
+    val addDateAdded: String
+        get() = "ALTER TABLE $TABLE ADD COLUMN $COL_DATE_ADDED LONG NOT NULL DEFAULT 0"
+
+    /**
+     * Used with addDateAdded to populate it with the oldest chapter fetch date.
+     */
+    val backfillDateAdded: String
+        get() = "UPDATE $TABLE SET $COL_DATE_ADDED = " +
+            "(SELECT MIN(${ChapterTable.COL_DATE_FETCH}) " +
+            "FROM $TABLE INNER JOIN ${ChapterTable.TABLE} " +
+            "ON $TABLE.$COL_ID = ${ChapterTable.TABLE}.${ChapterTable.COL_MANGA_ID} " +
+            "GROUP BY $TABLE.$COL_ID)"
 }
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/advanced/process/MigrationProcessAdapter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/advanced/process/MigrationProcessAdapter.kt
index 7c6b66846..20d9ec11e 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/advanced/process/MigrationProcessAdapter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/advanced/process/MigrationProcessAdapter.kt
@@ -8,6 +8,7 @@ import eu.kanade.tachiyomi.data.database.models.MangaCategory
 import eu.kanade.tachiyomi.data.preference.PreferencesHelper
 import eu.kanade.tachiyomi.ui.browse.migration.MigrationFlags
 import eu.kanade.tachiyomi.util.lang.launchUI
+import java.util.Date
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.cancel
 import kotlinx.coroutines.withContext
@@ -135,7 +136,10 @@ class MigrationProcessAdapter(
         // Update favorite status
         if (replace) {
             prevManga.favorite = false
+            manga.date_added = prevManga.date_added
             db.updateMangaFavorite(prevManga).executeAsBlocking()
+        } else {
+            manga.date_added = Date().time
         }
         manga.favorite = true
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrationMangaPresenter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrationMangaPresenter.kt
index 0f6d7cfdd..ca0e929e9 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrationMangaPresenter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/manga/MigrationMangaPresenter.kt
@@ -11,6 +11,7 @@ import eu.kanade.tachiyomi.ui.base.presenter.BasePresenter
 import eu.kanade.tachiyomi.ui.browse.migration.MigrationFlags
 import eu.kanade.tachiyomi.util.chapter.syncChaptersWithSource
 import exh.debug.DebugFunctions.sourceManager
+import java.util.Date
 import rx.Observable
 import rx.android.schedulers.AndroidSchedulers
 import rx.schedulers.Schedulers
@@ -101,7 +102,11 @@ class MigrationMangaPresenter(
             // Update favorite status
             if (replace) {
                 prevManga.favorite = false
+                manga.date_added = prevManga.date_added
+                prevManga.date_added = 0
                 db.updateMangaFavorite(prevManga).executeAsBlocking()
+            } else {
+                manga.date_added = Date().time
             }
             manga.favorite = true
             db.updateMangaFavorite(manga).executeAsBlocking()
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/BrowseSourcePresenter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/BrowseSourcePresenter.kt
index 457049887..b8d9d337a 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/BrowseSourcePresenter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/browse/source/browse/BrowseSourcePresenter.kt
@@ -39,6 +39,7 @@ import eu.kanade.tachiyomi.ui.browse.source.filter.TriStateSectionItem
 import eu.kanade.tachiyomi.util.removeCovers
 import exh.EXHSavedSearch
 import java.lang.RuntimeException
+import java.util.Date
 import kotlinx.coroutines.flow.subscribe
 import rx.Observable
 import rx.Subscription
@@ -279,9 +280,15 @@ open class BrowseSourcePresenter(
      */
     fun changeMangaFavorite(manga: Manga) {
         manga.favorite = !manga.favorite
+        manga.date_added = when (manga.favorite) {
+            true -> Date().time
+            false -> 0
+        }
+
         if (!manga.favorite) {
             manga.removeCovers(coverCache)
         }
+
         db.insertManga(manga).executeAsBlocking()
     }
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt
index 4a7e432ba..7fa2d5238 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt
@@ -33,6 +33,7 @@ import exh.favorites.FavoritesSyncHelper
 import exh.util.isLewd
 import java.util.Collections
 import java.util.Comparator
+import java.util.Date
 import rx.Observable
 import rx.Subscription
 import rx.android.schedulers.AndroidSchedulers
@@ -246,6 +247,7 @@ class LibraryPresenter(
                         ?: latestChapterManga.size
                     manga1latestChapter.compareTo(manga2latestChapter)
                 }
+                LibrarySort.DATE_ADDED -> i2.manga.date_added.compareTo(i1.manga.date_added)
                 // SY -->
                 LibrarySort.DRAG_AND_DROP -> {
                     0
@@ -481,7 +483,11 @@ class LibraryPresenter(
             // Update favorite status
             if (replace) {
                 prevManga.favorite = false
+                manga.date_added = prevManga.date_added
+                prevManga.date_added = 0
                 db.updateMangaFavorite(prevManga).executeAsBlocking()
+            } else {
+                manga.date_added = Date().time
             }
             manga.favorite = true
             db.updateMangaFavorite(manga).executeAsBlocking()
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibrarySettingsSheet.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibrarySettingsSheet.kt
index 0a6c93520..9c97a1b9f 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibrarySettingsSheet.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibrarySettingsSheet.kt
@@ -149,6 +149,7 @@ class LibrarySettingsSheet(
             private val lastChecked = Item.MultiSort(R.string.action_sort_last_checked, this)
             private val unread = Item.MultiSort(R.string.action_filter_unread, this)
             private val latestChapter = Item.MultiSort(R.string.action_sort_latest_chapter, this)
+            private val dateAdded = Item.MultiSort(R.string.action_sort_date_added, this)
             // SY -->
             private val dragAndDrop = Item.MultiSort(R.string.action_sort_drag_and_drop, this)
             // SY <--
@@ -174,9 +175,12 @@ class LibrarySettingsSheet(
                     if (sorting == LibrarySort.LAST_CHECKED) order else Item.MultiSort.SORT_NONE
                 unread.state =
                     if (sorting == LibrarySort.UNREAD) order else Item.MultiSort.SORT_NONE
-                total.state = if (sorting == LibrarySort.TOTAL) order else Item.MultiSort.SORT_NONE
+                total.state =
+                    if (sorting == LibrarySort.TOTAL) order else Item.MultiSort.SORT_NONE
                 latestChapter.state =
                     if (sorting == LibrarySort.LATEST_CHAPTER) order else Item.MultiSort.SORT_NONE
+                dateAdded.state =
+                    if (sorting == LibrarySort.DATE_ADDED) order else Item.MultiSort.SORT_NONE
                 // SY -->
                 dragAndDrop.state = if (sorting == LibrarySort.DRAG_AND_DROP) order else Item.MultiSort.SORT_NONE
                 // SY <--
@@ -211,6 +215,7 @@ class LibrarySettingsSheet(
                         unread -> LibrarySort.UNREAD
                         total -> LibrarySort.TOTAL
                         latestChapter -> LibrarySort.LATEST_CHAPTER
+                        dateAdded -> LibrarySort.DATE_ADDED
                         // SY -->
                         dragAndDrop -> LibrarySort.DRAG_AND_DROP
                         // SY <--
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibrarySort.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibrarySort.kt
index 95268d48a..0c203fe40 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibrarySort.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibrarySort.kt
@@ -8,6 +8,7 @@ object LibrarySort {
     const val UNREAD = 3
     const val TOTAL = 4
     const val LATEST_CHAPTER = 6
+    const val DATE_ADDED = 8
     // SY -->
     const val DRAG_AND_DROP = 7
     // SY <--
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsReaderController.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsReaderController.kt
index 220b4b36b..5b764e4d8 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsReaderController.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsReaderController.kt
@@ -4,6 +4,7 @@ import android.os.Build
 import androidx.preference.PreferenceScreen
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.preference.PreferenceKeys as Keys
+import eu.kanade.tachiyomi.data.preference.asImmediateFlow
 import eu.kanade.tachiyomi.util.preference.defaultValue
 import eu.kanade.tachiyomi.util.preference.entriesRes
 import eu.kanade.tachiyomi.util.preference.intListPreference
@@ -13,6 +14,7 @@ import eu.kanade.tachiyomi.util.preference.summaryRes
 import eu.kanade.tachiyomi.util.preference.switchPreference
 import eu.kanade.tachiyomi.util.preference.titleRes
 import eu.kanade.tachiyomi.util.system.hasDisplayCutout
+import kotlinx.coroutines.flow.launchIn
 
 class SettingsReaderController : SettingsController() {
 
diff --git a/app/src/main/java/exh/GalleryAdder.kt b/app/src/main/java/exh/GalleryAdder.kt
index 2a410168d..c6e73a731 100755
--- a/app/src/main/java/exh/GalleryAdder.kt
+++ b/app/src/main/java/exh/GalleryAdder.kt
@@ -8,6 +8,7 @@ import eu.kanade.tachiyomi.source.SourceManager
 import eu.kanade.tachiyomi.source.online.UrlImportableSource
 import eu.kanade.tachiyomi.source.online.all.EHentai
 import eu.kanade.tachiyomi.util.chapter.syncChaptersWithSource
+import java.util.Date
 import uy.kohesive.injekt.injectLazy
 
 class GalleryAdder {
@@ -93,7 +94,10 @@ class GalleryAdder {
             manga.copyFrom(newManga)
             manga.initialized = true
 
-            if (fav) manga.favorite = true
+            if (fav) {
+                manga.favorite = true
+                manga.date_added = Date().time
+            }
 
             db.insertManga(manga).executeAsBlocking()
 
diff --git a/app/src/main/java/exh/eh/EHentaiUpdateHelper.kt b/app/src/main/java/exh/eh/EHentaiUpdateHelper.kt
index 9c5e8ed5e..d575ec92e 100644
--- a/app/src/main/java/exh/eh/EHentaiUpdateHelper.kt
+++ b/app/src/main/java/exh/eh/EHentaiUpdateHelper.kt
@@ -9,6 +9,7 @@ import eu.kanade.tachiyomi.data.database.models.MangaCategory
 import exh.metadata.metadata.EHentaiSearchMetadata
 import exh.metadata.metadata.base.getFlatMetadataForManga
 import java.io.File
+import java.util.Date
 import rx.Observable
 import rx.Single
 import uy.kohesive.injekt.injectLazy
@@ -129,8 +130,12 @@ class EHentaiUpdateHelper(context: Context) {
                         }
                     }
 
-                toDiscard.forEach { it.manga.favorite = false }
+                toDiscard.forEach {
+                    it.manga.favorite = false
+                    it.manga.date_added = 0
+                }
                 accepted.manga.favorite = true
+                accepted.manga.date_added = Date().time
 
                 val newAccepted = ChapterChain(accepted.manga, newChapters)
                 val rootsToMutate = toDiscard + newAccepted
diff --git a/app/src/main/java/exh/favorites/FavoritesSyncHelper.kt b/app/src/main/java/exh/favorites/FavoritesSyncHelper.kt
index 30b1960f4..d5b758866 100644
--- a/app/src/main/java/exh/favorites/FavoritesSyncHelper.kt
+++ b/app/src/main/java/exh/favorites/FavoritesSyncHelper.kt
@@ -339,6 +339,7 @@ class FavoritesSyncHelper(val context: Context) {
 
                 if (manga?.favorite == true) {
                     manga.favorite = false
+                    manga.date_added = 0
                     db.updateMangaFavorite(manga).executeAsBlocking()
                     removedManga += manga
                 }
diff --git a/app/src/main/java/exh/favorites/LocalFavoritesStorage.kt b/app/src/main/java/exh/favorites/LocalFavoritesStorage.kt
index ca499d980..e09fc75c0 100644
--- a/app/src/main/java/exh/favorites/LocalFavoritesStorage.kt
+++ b/app/src/main/java/exh/favorites/LocalFavoritesStorage.kt
@@ -8,6 +8,7 @@ import exh.EXH_SOURCE_ID
 import exh.metadata.metadata.EHentaiSearchMetadata
 import io.realm.Realm
 import io.realm.RealmConfiguration
+import java.util.Date
 import uy.kohesive.injekt.injectLazy
 
 class LocalFavoritesStorage {
@@ -41,6 +42,7 @@ class LocalFavoritesStorage {
                         it.fav,
                         it.manga.apply {
                             favorite = true
+                            date_added = Date().time
                         }
                     )
                 }
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 5acbff1a4..4b71e5d38 100755
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -42,6 +42,7 @@
     <string name="action_sort_last_read">Last read</string>
     <string name="action_sort_last_checked">Last checked</string>
     <string name="action_sort_latest_chapter">Latest chapter</string>
+    <string name="action_sort_date_added">Date added</string>
     <string name="action_search">Search</string>
     <string name="action_global_search">Global search</string>
     <string name="action_select_all">Select all</string>