diff --git a/fhem/FHEM/99_Utils.pm b/fhem/FHEM/99_Utils.pm
index bccbd8309..7f54f426a 100644
--- a/fhem/FHEM/99_Utils.pm
+++ b/fhem/FHEM/99_Utils.pm
@@ -70,7 +70,7 @@ time_str2num($)
   my ($str) = @_;
   my @a;
   if($str) {
-    @a = split("[- :]", $str);
+    @a = split("[T: -]", $str);
     return mktime($a[5],$a[4],$a[3],$a[2],$a[1]-1,$a[0]-1900,0,0,-1);
   } else {
     my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time);