diff --git a/tools/commitLog.js b/tools/commitLog.js
index 2a55624..b6257f1 100644
--- a/tools/commitLog.js
+++ b/tools/commitLog.js
@@ -28,7 +28,8 @@
       hash: commit.hash,
       authorName: commit.authorName,
       authorEmail: commit.authorEmail,
-      authorDate: commit.authorDate,
+      // Git dates are not strict ISO-8601 by default
+      authorDate: new Date(commit.authorDate).toISOString(),
       authorDateRel: commit.authorDateRel,
       avatar: commit.avatar,
     });