diff --git a/src/applications/diffusion/controller/DiffusionCommitController.php b/src/applications/diffusion/controller/DiffusionCommitController.php
--- a/src/applications/diffusion/controller/DiffusionCommitController.php
+++ b/src/applications/diffusion/controller/DiffusionCommitController.php
@@ -624,6 +624,13 @@
     $author_view = $commit->newCommitAuthorView($viewer);
     if ($author_view) {
       $author_date = $data->getAuthorEpoch();
+
+      // Add support to Subversion commits that only have one date,
+      // since in SVN you cannot prepare local commits to push them later.
+      if ($author_date === null) {
+        $author_date = $commit->getEpoch();
+      }
+
       $author_date = phabricator_datetime($author_date, $viewer);
 
       $provenance_list->addItem(