diff --git a/TwitchDownloaderCLI/Modes/Arguments/ChatDownloadArgs.cs b/TwitchDownloaderCLI/Modes/Arguments/ChatDownloadArgs.cs
index b41f3109..02f2f27f 100644
--- a/TwitchDownloaderCLI/Modes/Arguments/ChatDownloadArgs.cs
+++ b/TwitchDownloaderCLI/Modes/Arguments/ChatDownloadArgs.cs
@@ -34,7 +34,7 @@ public class ChatDownloadArgs
         [Option("stv", Default = true, HelpText = "Enable 7TV embedding in chat download. Requires -E / --embed-images!")]
         public bool? StvEmotes { get; set; }
 
-        [Option("timestamp-format", Default = TimestampFormat.Relative, HelpText = "Sets the timestamp format for .txt chat logs. Valid values are: Utc, Relative, and None")]
+        [Option("timestamp-format", Default = TimestampFormat.Relative, HelpText = "Sets the timestamp format for .txt chat logs. Valid values are: Utc, UtcFull, Relative, and None")]
         public TimestampFormat TimeFormat { get; set; }
 
         [Option("chat-connections", Default = 4, HelpText = "Number of downloading connections for chat")]
diff --git a/TwitchDownloaderCLI/README.md b/TwitchDownloaderCLI/README.md
index 563f3c99..07dd179a 100644
--- a/TwitchDownloaderCLI/README.md
+++ b/TwitchDownloaderCLI/README.md
@@ -96,7 +96,7 @@ Time in seconds to crop ending. For example if I had a 10 second stream but only
 (Default: `true`) 7TV emote embedding. Requires `-E / --embed-images`.
 
 **--timestamp-format**
-(Default: `Relative`) Sets the timestamp format for .txt chat logs. Valid values are: `Utc`, `Relative`, and `None`.
+(Default: `Relative`) Sets the timestamp format for .txt chat logs. Valid values are: `Utc`, `UtcFull`, `Relative`, and `None`.
 
 **--chat-connections**
 (Default: `4`) The number of parallel downloads for chat.
diff --git a/TwitchDownloaderCore/Chat/ChatText.cs b/TwitchDownloaderCore/Chat/ChatText.cs
index 7aa1911b..2c686c22 100644
--- a/TwitchDownloaderCore/Chat/ChatText.cs
+++ b/TwitchDownloaderCore/Chat/ChatText.cs
@@ -28,7 +28,12 @@ public static async Task SerializeAsync(string filePath, ChatRoot chatRoot, Time
                 string message = comment.message.body;
                 if (timeFormat == TimestampFormat.Utc)
                 {
-                    string timestamp = comment.created_at.ToString("u").Replace("Z", " UTC");
+                    var timestamp = comment.created_at.ToString("yyyy'-'MM'-'dd HH':'mm':'ss 'UTC'");;
+                    await sw.WriteLineAsync($"[{timestamp}] {username}: {message}");
+                }
+                else if (timeFormat == TimestampFormat.UtcFull)
+                {
+                    var timestamp = comment.created_at.ToString("yyyy'-'MM'-'dd HH':'mm':'ss.fff 'UTC'");;
                     await sw.WriteLineAsync($"[{timestamp}] {username}: {message}");
                 }
                 else if (timeFormat == TimestampFormat.Relative)
diff --git a/TwitchDownloaderCore/Chat/TimestampFormat.cs b/TwitchDownloaderCore/Chat/TimestampFormat.cs
index e486371a..5386f812 100644
--- a/TwitchDownloaderCore/Chat/TimestampFormat.cs
+++ b/TwitchDownloaderCore/Chat/TimestampFormat.cs
@@ -4,6 +4,7 @@ public enum TimestampFormat
     {
         Utc,
         Relative,
-        None
+        None,
+        UtcFull
     }
 }