Fix zero time bug

service/datastore/serialize/serialize.go

Index: service/datastore/serialize/serialize.go
diff --git a/service/datastore/serialize/serialize.go b/service/datastore/serialize/serialize.go
index 0c58fcae712ce249acf633e5d0b7d089c7d8a415..baea9b328207cebe69a55f879ce7b0e97c41e71c 100644
--- a/service/datastore/serialize/serialize.go
+++ b/service/datastore/serialize/serialize.go
@@ -207,7 +207,11 @@ func ReadTime(buf Buffer) (time.Time, error) {
 	if err != nil {
 		return time.Time{}, err
 	}
-	return time.Unix(v/1e6, (v%1e6)*1e3).UTC(), nil
+	t := time.Unix(v/1e6, (v%1e6)*1e3)
+	if t.IsZero() {
+		return time.Time{}, nil
+	}
+	return t.UTC(), nil
 }
 
 // WriteProperty writes a Property to the buffer. `context` behaves the same