Cool, thanks for taking a look! Do you know of any official reference for how the Cloudflare CDN server clocks are synced? I looked around but didn't find one.

I originally built the clock on Fastly, but they (appear to) have clock offsets of hundreds of milliseconds, so I didn't release that version. Cloudflare CDN seems synchronized better than what I can measure, although I'm wary of hard to test corner cases, like newly deployed servers.