diff --git a/lib/xmet/igra.py b/lib/xmet/igra.py
index b875086..8196cf1 100644
--- a/lib/xmet/igra.py
+++ b/lib/xmet/igra.py
@@ -114,9 +114,10 @@ class IGRAReader():
         sounding.station = match['id']
 
         date = datetime.datetime(
-            year  = int(match['year']),
-            month = int(match['month']),
-            day   = int(match['day'])
+            year   = int(match['year']),
+            month  = int(match['month']),
+            day    = int(match['day']),
+            tzinfo = datetime.UTC
         )
 
         timestamp         = date.astimezone(datetime.UTC)