Setup
Get a personal access token to "Control all devices"
Put this in a file ~/.config/@smartthings/headers:
Authorization: Bearer <personal access token>
Get the oven device id using smartthings-cli:
smartthings devices
Run overnight
0 3 * * * cronty samsung-oven-time-sync --cron <device id>
Alternatives
You can do this with smartthings-cli too:
NOW="{\"x.com.samsung.da.currentTime\":\"$(date +%Y-%m-%dT%H:%M:%S)\"}"
smartthings devices:commands <device id> "main:execute:execute(\"/configuration/vs/0\", $NOW)"