diff --git a/.travis.yml b/.travis.yml
index eef5cd14b..cfb067c24 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -31,7 +31,7 @@ jobs:
       node_js: 8
       env: NPM_SCRIPT=build
       before_deploy:
-      - npm --no-git-tag-version version $($(npm bin)/json -f package.json version)-prerelease.$(date +%s)
+      - npm --no-git-tag-version version $($(npm bin)/json -f package.json version)-prerelease.$(date +%Y%m%d%H%M%S)
       - git config --global user.email "$(git log --pretty=format:"%ae" -n1)"
       - git config --global user.name "$(git log --pretty=format:"%an" -n1)"
       deploy: