diff --git a/app/src/main/java/io/legado/app/help/storage/AppWebDav.kt b/app/src/main/java/io/legado/app/help/storage/AppWebDav.kt
index 0b084639e..e219ee59c 100644
--- a/app/src/main/java/io/legado/app/help/storage/AppWebDav.kt
+++ b/app/src/main/java/io/legado/app/help/storage/AppWebDav.kt
@@ -142,7 +142,7 @@ object AppWebDav {
         return kotlin.runCatching {
             authorization?.let {
                 var lastBackupFile: WebDavFile? = null
-                WebDav(rootWebDavUrl, it).listFiles().forEach { webDavFile ->
+                WebDav(rootWebDavUrl, it).listFiles().reversed().forEach { webDavFile ->
                     if (webDavFile.displayName.startsWith("backup")) {
                         if (lastBackupFile == null
                             || webDavFile.lastModify > lastBackupFile!!.lastModify
diff --git a/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt b/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt
index 013247a8b..d27e731de 100644
--- a/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt
+++ b/app/src/main/java/io/legado/app/lib/webdav/WebDav.kt
@@ -20,7 +20,6 @@ import java.net.MalformedURLException
 import java.net.URL
 import java.net.URLEncoder
 import java.text.SimpleDateFormat
-import java.util.*
 
 @Suppress("unused", "MemberVisibilityCanBePrivate")
 open class WebDav(urlStr: String, val authorization: Authorization) {
@@ -133,12 +132,12 @@ open class WebDav(urlStr: String, val authorization: Authorization) {
                             element.getElementsByTag("d:getcontentlength")
                                 .firstOrNull()?.text()?.toLong() ?: 0
                         }.getOrDefault(0)
-                        val lastModify: Date? = kotlin.runCatching {
+                        val lastModify: Long = kotlin.runCatching {
                             element.getElementsByTag("d:getcontentlength")
                                 .firstOrNull()?.text()?.let {
                                     dateFormat.parse(it)
                                 }
-                        }.getOrNull()
+                        }.getOrNull()?.time ?: 0
                         webDavFile = WebDavFile(
                             baseUrl + fileName,
                             authorization,
diff --git a/app/src/main/java/io/legado/app/lib/webdav/WebDavFile.kt b/app/src/main/java/io/legado/app/lib/webdav/WebDavFile.kt
index d5c00852f..b0ad187b7 100644
--- a/app/src/main/java/io/legado/app/lib/webdav/WebDavFile.kt
+++ b/app/src/main/java/io/legado/app/lib/webdav/WebDavFile.kt
@@ -1,10 +1,9 @@
 package io.legado.app.lib.webdav
 
-import java.util.*
-
 /**
  * webDavFile
  */
+@Suppress("unused")
 class WebDavFile(
     urlStr: String,
     authorization: Authorization,
@@ -12,5 +11,5 @@ class WebDavFile(
     val urlName: String,
     val size: Long,
     val contentType: String,
-    val lastModify: Date?
+    val lastModify: Long
 ) : WebDav(urlStr, authorization)
\ No newline at end of file
diff --git a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
index 72ba2267c..fae0b97bf 100644
--- a/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
+++ b/app/src/main/java/io/legado/app/ui/main/MainActivity.kt
@@ -97,7 +97,7 @@ class MainActivity : VMBaseActivity<ActivityMainBinding, MainViewModel>(),
         launch {
             val lastBackupFile = withContext(IO) { AppWebDav.lastBackUp().getOrNull() }
                 ?: return@launch
-            if (lastBackupFile.lastModify?.time ?: 0 - LocalConfig.lastBackup > DateUtils.MINUTE_IN_MILLIS) {
+            if (lastBackupFile.lastModify - LocalConfig.lastBackup > DateUtils.MINUTE_IN_MILLIS) {
                 alert("恢复", "webDav书源比本地新,是否恢复") {
                     cancelButton()
                     okButton {