1 files changed, 14 insertions, 0 deletions
diff --git a/lib/PublicInbox/Thread.pm b/lib/PublicInbox/Thread.pm
index 7dabf243..58efb8dc 100644
--- a/lib/PublicInbox/Thread.pm
+++ b/lib/PublicInbox/Thread.pm
@@ -12,6 +12,20 @@ if ($Mail::Thread::VERSION <= 2.55) {
          eval q(sub _container_class { 'PublicInbox::Thread::Container' });
  }
  
+sub sort_ts {
+        sort {
+                (eval { $a->topmost->message->header('X-PI-TS') } || 0) <=>
+                (eval { $b->topmost->message->header('X-PI-TS') } || 0)
+        } @_;
+}
+
+sub rsort_ts {
+        sort {
+                (eval { $b->topmost->message->header('X-PI-TS') } || 0) <=>
+                (eval { $a->topmost->message->header('X-PI-TS') } || 0)
+        } @_;
+}
+
  package PublicInbox::Thread::Container;
  use strict;
  use warnings;