[Unit]
Description=Synchronise Hardware Clock to System Clock
DefaultDependencies=no
Before=shutdown.target
ConditionFileIsExecutable=!/usr/sbin/ntpd
ConditionFileIsExecutable=!/usr/sbin/openntpd
ConditionFileIsExecutable=!/usr/sbin/chrony
ConditionVirtualization=!container

[Service]
Type=oneshot
ExecStart=/sbin/hwclock -D --systohc

[Install]
WantedBy=reboot.target halt.target poweroff.target