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Using Cloudflare CDN to synchronize a clock
(alexsci.com)
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this post was submitted on 19 Apr 2026
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Programming
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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.