diff --git a/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupExport.kt b/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupExport.kt
index 996b83fc..05991082 100644
--- a/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupExport.kt
+++ b/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupExport.kt
@@ -32,6 +32,7 @@ import suwayomi.tachidesk.manga.model.table.SourceTable
 import suwayomi.tachidesk.manga.model.table.toDataClass
 import java.io.ByteArrayOutputStream
 import java.io.InputStream
+import java.util.concurrent.TimeUnit
 
 object ProtoBackupExport : ProtoBackupBase() {
     suspend fun createBackup(flags: BackupFlags): InputStream {
@@ -68,7 +69,7 @@ object ProtoBackupExport : ProtoBackupBase() {
                 mangaRow[MangaTable.genre]?.split(", ") ?: emptyList(),
                 MangaStatus.valueOf(mangaRow[MangaTable.status]).value,
                 mangaRow[MangaTable.thumbnail_url],
-                mangaRow[MangaTable.inLibraryAt],
+                TimeUnit.SECONDS.toMillis(mangaRow[MangaTable.inLibraryAt]),
                 0, // not supported in Tachidesk
             )
 
@@ -84,7 +85,7 @@ object ProtoBackupExport : ProtoBackupBase() {
                         it.read,
                         it.bookmarked,
                         it.lastPageRead,
-                        it.fetchedAt,
+                        TimeUnit.SECONDS.toMillis(it.fetchedAt),
                         it.uploadDate,
                         it.chapterNumber,
                         chapters.size - it.index,
diff --git a/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt b/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt
index 965a54e5..125ac59c 100644
--- a/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt
+++ b/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt
@@ -34,6 +34,7 @@ import suwayomi.tachidesk.manga.model.table.MangaTable
 import java.io.InputStream
 import java.lang.Integer.max
 import java.util.Date
+import java.util.concurrent.TimeUnit
 
 object ProtoBackupImport : ProtoBackupBase() {
     private val logger = KotlinLogging.logger {}
@@ -149,7 +150,7 @@ object ProtoBackupImport : ProtoBackupBase() {
 
                     it[inLibrary] = manga.favorite
 
-                    it[inLibraryAt] = manga.date_added
+                    it[inLibraryAt] = TimeUnit.MILLISECONDS.toSeconds(manga.date_added)
                 }.value
 
                 // insert chapter data
@@ -169,7 +170,7 @@ object ProtoBackupImport : ProtoBackupBase() {
                         it[lastPageRead] = chapter.last_page_read
                         it[isBookmarked] = chapter.bookmark
 
-                        it[fetchedAt] = chapter.date_fetch
+                        it[fetchedAt] = TimeUnit.MILLISECONDS.toSeconds(chapter.date_fetch)
                     }
                 }
 
@@ -194,6 +195,8 @@ object ProtoBackupImport : ProtoBackupBase() {
                     it[initialized] = dbManga[initialized] || manga.description != null
 
                     it[inLibrary] = manga.favorite || dbManga[inLibrary]
+
+                    it[inLibraryAt] = TimeUnit.MILLISECONDS.toSeconds(manga.date_added)
                 }
 
                 // merge chapter data