diff --git a/src/core/Temporal.pm b/src/core/Temporal.pm
index ea303eb2cc8..ecdda49aba1 100644
--- a/src/core/Temporal.pm
+++ b/src/core/Temporal.pm
@@ -251,7 +251,7 @@ my class DateTime does Dateish {
     }
 
     multi method new(Str $format, :$timezone is copy = 0, :&formatter=&default-formatter) {
-        $format ~~ /^ (\d**4) '-' (\d\d) '-' (\d\d) T (\d\d) ':' (\d\d) ':' (\d\d) (Z || (<[\-\+]>) (\d\d)(\d\d))? $/
+        $format ~~ /^ (\d**4) '-' (\d\d) '-' (\d\d) T (\d\d) ':' (\d\d) ':' (\d\d) (Z || (<[\-\+]>) (\d\d) (':'? (\d\d))? )? $/
             or X::Temporal::InvalidFormat.new(
                     invalid-str => $format,
                     target      => 'DateTime',
@@ -269,7 +269,7 @@ my class DateTime does Dateish {
             if $6 eq 'Z' {
                 $timezone = 0;                
             } else {
-                $timezone = (($6[1]*60 + $6[2]) * 60).Int;
+                $timezone = (($6[1]*60 + ($6[2][0] // 0)) * 60).Int;
                   # RAKUDO: .Int is needed to avoid to avoid the nasty '-0'.
                 $6[0] eq '-' and $timezone = -$timezone;
             }