Interesting account on the reimplementation of NTP (network time protocol, what is responsible for accurate time on all your devices) 2022-11-12: And now it's time for PTP

Where NTP allows for precision within milliseconds, PTP allows for precision within nanoseconds. PTP has the potential to enable synchronization of GPUs across data centers, which could open up unprecedented scale in AI capabilities that is difficult to achieve today. This level of accuracy will help ensure synchronization of not only the computers on our networks today but also the advanced systems that will be on our networks in the future.

2026-10-06: Stateless Network Time Security

Meta deployed Network Time Security (RFC 8915) across its public infrastructure at nts.meta.com and open-sourced the full protocol, server, and client implementation in their Time library. To handle Meta-scale traffic without memory bloat, their NTS servers maintain 0 per-client state: cookie keys are derived ephemerally via symmetric cryptography rather than stored or replicated. Having previously pushed internal precision from 10 milliseconds down to 100 microseconds, this transition shifts focus from sub-millisecond clock drift to cryptographic authenticity, eliminating on-path packet spoofing against TLS certificate validation and token expirations. engineering.fb.com