diff --git a/faster_whisper/__init__.py b/faster_whisper/__init__.py
index 08b3009..93ebfce 100644
--- a/faster_whisper/__init__.py
+++ b/faster_whisper/__init__.py
@@ -1 +1,2 @@
 from faster_whisper.transcribe import WhisperModel
+from faster_whisper.utils import format_timestamp
diff --git a/faster_whisper/utils.py b/faster_whisper/utils.py
new file mode 100644
index 0000000..6b03050
--- /dev/null
+++ b/faster_whisper/utils.py
@@ -0,0 +1,21 @@
+def format_timestamp(
+    seconds: float,
+    always_include_hours: bool = False,
+    decimal_marker: str = ".",
+):
+    assert seconds >= 0, "non-negative timestamp expected"
+    milliseconds = round(seconds * 1000.0)
+
+    hours = milliseconds // 3_600_000
+    milliseconds -= hours * 3_600_000
+
+    minutes = milliseconds // 60_000
+    milliseconds -= minutes * 60_000
+
+    seconds = milliseconds // 1_000
+    milliseconds -= seconds * 1_000
+
+    hours_marker = f"{hours:02d}:" if always_include_hours or hours > 0 else ""
+    return (
+        f"{hours_marker}{minutes:02d}:{seconds:02d}{decimal_marker}{milliseconds:03d}"
+    )