diff --git a/script/ci-set-timestamps b/script/ci-set-timestamps
index 780b729b..56a0abd3 100755
--- a/script/ci-set-timestamps
+++ b/script/ci-set-timestamps
@@ -1,6 +1,6 @@
 #!/bin/sh
 
-BUILD_TIMESTAMP=`date -d $CI_COMMIT_TIMESTAMP +CCYYMMDDhhmm.SS`
+BUILD_TIMESTAMP=`date -d $CI_COMMIT_TIMESTAMP +%Y%m%d%H%M.%S`
 
 echo $BUILD_TIMESTAMP
 touch -t $BUILD_TIMESTAMP apps/**/*.ex apps/**/*.exs config/**/*.ex config/**/*.exs mix.exs