diff --git a/multiparser/parsing/tail.py b/multiparser/parsing/tail.py
index a5b13d9..6fc88ef 100644
--- a/multiparser/parsing/tail.py
+++ b/multiparser/parsing/tail.py
@@ -54,10 +54,11 @@ def _wrapper(*args, file_content, **kwargs) -> TimeStampedData:
             raise RuntimeError("Failed to retrieve argument '__read_bytes'")
         if not (_input_file := kwargs.get("__input_file")):
             raise RuntimeError("Failed to retrieve argument '__input_file'")
+        _time_stamp = datetime.datetime.fromtimestamp(
+            timestamp=os.path.getmtime(_input_file), tz=datetime.timezone.utc
+        )
         _meta_data: dict[str, str] = {
-            "timestamp": datetime.datetime.fromtimestamp(
-                os.path.getmtime(_input_file)
-            ).strftime("%Y-%m-%d %H:%M:%S.%f"),
+            "timestamp": f"{_time_stamp}",
             "hostname": platform.node(),
             "file_name": _input_file,
             "__read_bytes": kwargs["__read_bytes"],
@@ -607,7 +608,7 @@ def record_log(
             __read_bytes=__read_bytes,
             tracked_values=tracked_values,
             convert=convert,
-            **parser_kwargs
+            **parser_kwargs,
         )
         _data.append(_processed)  # type: ignore
         _metadata = _metadata or _metadata_line
diff --git a/multiparser/thread.py b/multiparser/thread.py
index 5c867aa..6537bfb 100644
--- a/multiparser/thread.py
+++ b/multiparser/thread.py
@@ -315,7 +315,7 @@ def _append_thread(
         parser_func: typing.Callable | None = None,
         file_type: str | None = None,
         glob_expr: str | None = None,
-        **parser_kwargs
+        **parser_kwargs,
     ) -> None:
         """Create a new thread for a monitored file
 
@@ -366,11 +366,11 @@ def _read_loop(
 
                     _modified_time_stamp = os.path.getmtime(file_name)
                     _modified_time = datetime.datetime.fromtimestamp(
-                        _modified_time_stamp
-                    ).strftime("%Y-%M-%d %H:%M:%S.%f")
+                        timestamp=_modified_time_stamp, tz=datetime.timezone.utc
+                    )
 
                     # If the file has not been modified then we do not need to parse it
-                    if (_modified_time, file_name) in records:
+                    if (f"{_modified_time}", file_name) in records:
                         continue
                     _cached_metadata = _reparse_action(
                         file_type=file_type,
@@ -382,11 +382,11 @@ def _read_loop(
                         lock=self._lock,
                         flatten_data=flatten_data,
                         cached_metadata=_cached_metadata,
-                        modified_time=_modified_time,
+                        modified_time=f"{_modified_time}",
                         **kwargs,
                     )
 
-                    records.append((_modified_time, file_name))
+                    records.append((f"{_modified_time}", file_name))
 
                     # If only a single read is required terminate loop
                     if static_read: