Well if it makes you more comfortable let me tell you that the format of OnCalendar is the same, or very close. I bet that just by looking at the following you know what is does!
<span style="color:#323232;">[Unit]
</span><span style="color:#323232;">Description=Logs some system statistics to the systemd journal
</span><span style="color:#323232;">Requires=myMonitor.service
</span><span style="color:#323232;">
</span><span style="color:#323232;">[Timer]
</span><span style="color:#323232;">Unit=myMonitor.service
</span><span style="color:#323232;">OnCalendar=*-*-* *:*:00
</span><span style="color:#323232;">
</span><span style="color:#323232;">[Install]
</span><span style="color:#323232;">WantedBy=timers.target
</span>