diff --git a/gramps/plugins/webreport/narrativeweb.py b/gramps/plugins/webreport/narrativeweb.py
index 8e2aaa73f..7181ec3d9 100644
--- a/gramps/plugins/webreport/narrativeweb.py
+++ b/gramps/plugins/webreport/narrativeweb.py
@@ -9168,7 +9168,7 @@ class NavWebReport(Report):
             output_file.flush()
             tarinfo = tarfile.TarInfo(self.cur_fname)
             tarinfo.size = len(string_io.getvalue())
-            tarinfo.mtime = date if date is not None else time.time()
+            tarinfo.mtime = date if date != 0 else time.time()
             if not win():
                 tarinfo.uid = os.getuid()
                 tarinfo.gid = os.getgid()