[Unit]
Description=Set time via SNTP
After=network.target network-online.target nss-lookup.target
Before=time-sync.target
Wants=network-online.target time-sync.target
Conflicts=systemd-timesyncd.service

[Service]
Type=oneshot
ExecStart=/usr/bin/sntp -s $SERVER
RemainAfterExit=yes

[Install]
WantedBy=multi-user.target