From Fedora Project Wiki
Systemd packaging
Setting up the environment
For sys V packages
Cron job to timer migration
For timer migration create a timers.txt file with the following content.
amavisd-new apt arm4 atop bcfg2 clement cyrus-imapd dbmail denyhosts dspam exim fetch-crl freeipa hylafax+ inn leafnode ltsp mailman mcelog mdadm mldonkey newscache nsd opendnssec openvas-scanner ovirt-engine ovirt-node polipo sagator sipwitch spamassassin squidGuard subscription-manager sysstat vdsm vnstat yum-cron
Then let's git clone the packages from Fedora
while read line do git clone git://pkgs.fedoraproject.org/$line done < timers.txt
And finally create a separated branch to work on
while read line do cd $line; git checkout -b systemd-timers; cd - done < timers.txt