[Unit]
Description=Monthly rental utilities message

[Timer]
# The 5th: late enough that both statements for the previous month have
# normally landed, early enough to leave room to chase one that has not.
OnCalendar=*-*-05 09:00:00
# If the machine was down on the 5th, still run on the next boot rather than
# skipping the month entirely.
Persistent=true
RandomizedDelaySec=5m
AccuracySec=1min

[Install]
WantedBy=timers.target