diff --git a/process_chunks.py b/process_chunks.py
index 378efa4..0ff70ff 100755
--- a/process_chunks.py
+++ b/process_chunks.py
@@ -64,7 +64,12 @@ def process_chunk(filename):
             clip_end = min(len(data), i + chunk_samples + padding_after)
             clip = data[clip_start:clip_end]
 
-            event_time = datetime.now().strftime("%Y%m%d-%H%M%S")
+            chunk_start_str = os.path.splitext(filename)[0]
+            chunk_start_dt = datetime.strptime(chunk_start_str, "%Y%m%d-%H%M")
+            event_offset = (i - padding_before) / samplerate
+            event_time_dt = chunk_start_dt + datetime.timedelta(seconds=event_offset)
+            event_time = event_time_dt.strftime("%Y%m%d-%H%M%S")
+
             base_name = os.path.splitext(filename)[0]
             flac_out = os.path.join(OUTPUT_DIR, f"{base_name}_{event_time}.flac")
             png_out = os.path.join(OUTPUT_DIR, f"{base_name}_{event_time}.png")