diff --git a/pkg/logfile/logfile.go b/pkg/logfile/logfile.go
index 064bd4b..23b2f95 100644
--- a/pkg/logfile/logfile.go
+++ b/pkg/logfile/logfile.go
@@ -176,6 +176,8 @@ func WriteTemperaturesCustom(temperatures []*types.Temperature, w io.Writer, com
 func writeCreationDate(temperatures []*types.Temperature) {
 	now := time.Now()
 	for _, temperature := range temperatures {
-		temperature.CreationDate = &now
+		if temperature.CreationDate == nil {
+			temperature.CreationDate = &now
+		}
 	}
 }