diff --git a/roles/backup/tasks/postgres.yml b/roles/backup/tasks/postgres.yml
index f14bc8772..a4aef2ceb 100644
--- a/roles/backup/tasks/postgres.yml
+++ b/roles/backup/tasks/postgres.yml
@@ -50,7 +50,7 @@
 
 - name: Determine the timestamp for the backup once for all nodes
   set_fact:
-    now: '{{ lookup("pipe", "date +%F-%T") }}'
+    now: '{{ lookup("pipe", "date +%F-%H%M%S") }}'
 
 - name: Set backup directory name
   set_fact: