Retrieval of epoch moved to extensions

3 files changed, 16 insertions, 1 deletions

diff --git a/Duplicati/Library/Backend/Telegram/Duplicati.Library.Backend.Telegram.csproj b/Duplicati/Library/Backend/Telegram/Duplicati.Library.Backend.Telegram.csproj
index 7e8c7f6c9..f26ce5fd3 100644
--- a/Duplicati/Library/Backend/Telegram/Duplicati.Library.Backend.Telegram.csproj
+++ b/Duplicati/Library/Backend/Telegram/Duplicati.Library.Backend.Telegram.csproj
@@ -52,6 +52,7 @@
   <ItemGroup>
     <Compile Include="ChannelFileInfo.cs" />
     <Compile Include="EncryptedFileSessionStore.cs" />
+    <Compile Include="Extensions\SystemExtensions.cs" />
     <Compile Include="Extensions\TelegramClientExtensions.cs" />
     <Compile Include="StreamReadHelper.cs" />
     <Compile Include="TelegramBackend.cs" />
diff --git a/Duplicati/Library/Backend/Telegram/Extensions/SystemExtensions.cs b/Duplicati/Library/Backend/Telegram/Extensions/SystemExtensions.cs
new file mode 100644
index 000000000..1b74eef71
--- /dev/null
+++ b/Duplicati/Library/Backend/Telegram/Extensions/SystemExtensions.cs
@@ -0,0 +1,14 @@
+using System;
+
+namespace Duplicati.Library.Backend.Extensions
+{
+    public static class SystemExtensions
+    {
+        private static readonly DateTime m_firstDate = new DateTime(1970, 1, 1);
+        
+        public static long GetEpochSeconds(this DateTime dateTime)
+        {
+            return (long)dateTime.Subtract(m_firstDate).TotalSeconds;
+        }
+    }
+}
\ No newline at end of file
diff --git a/Duplicati/Library/Backend/Telegram/TelegramBackend.cs b/Duplicati/Library/Backend/Telegram/TelegramBackend.cs
index 380cd4f7f..77cb021d7 100644
--- a/Duplicati/Library/Backend/Telegram/TelegramBackend.cs
+++ b/Duplicati/Library/Backend/Telegram/TelegramBackend.cs
@@ -253,7 +253,7 @@ namespace Duplicati.Library.Backend
             {
                 oldMinDate = newMinDate ?? 0;
                 RetrieveMessages(inputPeerChannel, result, oldMinDate);
-                newMinDate = result.Min(cfi => (int)cfi.Date.Subtract(new DateTime(1970, 1, 1)).TotalSeconds);
+                newMinDate = result.Min(cfi => (int)cfi.Date.GetEpochSeconds());
             }
 
             result = result.Distinct().ToList();