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You sync to the NIST time servers (sample code available via linked page) via a cron job that invokes the script, whenever the IoT device is rebooted.

1. NIST Time Server Page: https://www.nist.gov/pml/time-and-frequency-division/service...

2. Crontab @reboot function: https://superuser.com/questions/708149/how-to-use-reboot-in-...

Make sure to always cite your references by comments. This is useful in case parts of your code become unintentionally obsolete. This also helps you and others proofread your work.