Update Gentoo repository if older than a time

play.yml

- name: register repository timestamp
  shell: date -ud "$(cat /var/db/repos/gentoo/metadata/timestamp.chk)" +%s
  register: repo_timestamp
  changed_when: false
- name: update repository
  # Only run when the repo's timestamp is from more than an hour ago
  when: (((ansible_date_time['epoch'] | int) - (repo_timestamp['stdout'] | int)) > 3600)
  portage:
    sync: true