generated on is datetime, not date
diff --git a/erpnext/regional/report/datev/datev.py b/erpnext/regional/report/datev/datev.py
index a3cc180..fe2add9 100644
--- a/erpnext/regional/report/datev/datev.py
+++ b/erpnext/regional/report/datev/datev.py
@@ -293,7 +293,7 @@
 		# E = Format version (regarding format name)
 		csv_class.FORMAT_VERSION,
 		# F = Generated on
-		datetime.datetime.now().strftime("%Y%m%d"),
+		datetime.datetime.now().strftime("%Y%m%d%H%M%S"),
 		# G = Imported on -- stays empty
 		"",
 		# H = Origin (SV = other (?), RE = KARE)