diff --git a/README.md b/README.md
index df16489..57416a0 100644
--- a/README.md
+++ b/README.md
@@ -92,6 +92,8 @@
             
   `-logmode` instructs SimplySerial to either `APPEND` to an existing log file, or `OVERWRITE` an existing log file.  In either case, if the specified log file does not exist, it will be created.  If neither option is specified, `OVERWRITE` is assumed.  (ex. `-logmode:APPEND`)
 
+  `-logtime` enable/disable prepending of timestamps before each logged line. Defaults to `off`.  (ex. `-logtime:on`)
+
   `-quiet` prevents any application messages (connection banner, error messages, etc.) from printing out to the console
 
   `-forcenewline` replaces carriage returns with linefeeds in received data. (ex. `-forcenewline:on`)
diff --git a/SimplySerial/SimplySerial.cs b/SimplySerial/SimplySerial.cs
index 5fa9388..994975f 100644
--- a/SimplySerial/SimplySerial.cs
+++ b/SimplySerial/SimplySerial.cs
@@ -55,6 +55,7 @@ class SimplySerial
         static int dataBits = 8;
         static StopBits stopBits = StopBits.One;
         static bool logging = false;
+        static bool logTime = false;
         static FileMode logMode = FileMode.Create;
         static string logFile = string.Empty;
         static string logData = string.Empty;
@@ -352,7 +353,7 @@ static void Main(string[] args)
                     port.board.make,
                     port.board.model,
                     (port.isCircuitPython) ? " (CircuitPython-capable)" : "",
-                    (logging == true) ? ($"Logfile   : {logFile} (Mode = " + ((logMode == FileMode.Create) ? "OVERWRITE" : "APPEND") + ")\n") : "",
+                    (logging == true) ? ($"Logfile   : {logFile} (Mode = " + ((logMode == FileMode.Create) ? "OVERWRITE" : "APPEND") + ", Timestamps = " + ((logTime) ? "on" : "off") + ")\n") : "",
                     exitKey
                 ), flush: true); ;
 
@@ -711,6 +712,11 @@ static void ArgHandler_Log(string value)
             logFile = value;
         }
 
+        static void ArgHandler_LogTime(string value)
+        {
+            logTime = ArgProcessor_OnOff(value);
+        }
+
         static void ArgHandler_LogMode(string value)
         {
             value = value.ToLower();
@@ -909,6 +915,7 @@ static void ProcessArguments(string[] args)
             CommandLineArguments.Add("exitkey", new CommandLineArgument("exitkey", handler: ArgHandler_ExitKey));
             CommandLineArguments.Add("forcenewline", new CommandLineArgument("forcenewline", handler: ArgHandler_ForceNewLine));
             CommandLineArguments.Add("logmode", new CommandLineArgument("logmode", handler: ArgHandler_LogMode));
+            CommandLineArguments.Add("logtime", new CommandLineArgument("logtime", handler: ArgHandler_LogTime));
             CommandLineArguments.Add("parity", new CommandLineArgument("parity", handler: ArgHandler_Parity));
             CommandLineArguments.Add("txonenter", new CommandLineArgument("txonenter", handler: ArgHandler_TXOnEnter));
 
@@ -1009,7 +1016,21 @@ static void Output(string message, bool force = false, bool newline = true, bool
 
                 if (logging)
                 {
-                    logData += message;
+                    if (logTime && !String.IsNullOrEmpty(message))
+                    {
+                        // Add timestamp if start of line
+                        if (string.IsNullOrEmpty(logData) || logData[logData.Length - 1] == '\n')
+                            logData += $"{DateTime.Now}: ";
+                        // Add timestamp for intermediate lines
+                        logData += message.Substring(0, message.Length - 1).Replace("\n", $"\n{DateTime.Now}: ");
+                        // No timestamp, if last character is a newline
+                        // Timestamp will than be added in next call
+                        logData += message[logData.Length - 1];
+                    }
+                    else
+                    {
+                        logData += message;
+                    }
                     if ((logData.Length >= bufferSize) || flush)
                     {
                         try
@@ -1064,6 +1085,7 @@ static void ShowHelp()
             Console.WriteLine("  -echo:VAL         ON | OFF enable or disable printing typed characters locally");
             Console.WriteLine("  -log:LOGFILE      Logs all output to the specified file.");
             Console.WriteLine("  -logmode:MODE     APPEND | OVERWRITE, default is OVERWRITE");
+            Console.WriteLine("  -logtime:VAL      ON | OFF enable/disable prepending timestamps to every logged line, default is OFF");
             Console.WriteLine("  -quiet:VAL        ON | OFF when enabled, don't print any application messages/errors to console");
             Console.WriteLine("  -forcenewline:VAL ON | OFF enable/disable forcing of linefeeds (newline) in place of carriage returns in received data.");
             Console.WriteLine("  -encoding:ENC     UTF8 | ASCII | RAW");