/var/lib/systemd/timers/stamp-cron-*.timer
/var/lib/systemd/timers/stamp-systemd-cron-cleaner.timer
# optional symlink to /usr/lib/systemd/system-generators/systemd-crontab-generator

# that enable experimental "use systemd user instance" feature.

/usr/lib/systemd/user-generators/systemd-crontab-generator

