diff --git a/src/tools.py b/src/tools.py
index ee78528e96f0fdfab96a065b40d006c553806fcb..84aca8481518b854943942161ca3dd93e7416a2b 100644
--- a/src/tools.py
+++ b/src/tools.py
@@ -252,8 +252,9 @@ def old_pamhyr_date_to_timestamp(date: str):
 
 
 def timestamp_to_old_pamhyr_date(time: int):
+    logger.debug(f"timestamp_to_old_pamhyr_date({time}: {type(time)})")
     t0 = datetime.fromtimestamp(0)
-    t = datetime.fromtimestamp(time)
+    t = datetime.fromtimestamp(int(time))
 
     dt = t - t0
     hours = dt.seconds // 3600