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https://web.archive.org/web/20170103200607/https://blog.cloudflare.com/how-and-why-the-leap-second-affected-cloudflare-dns/ how not to use non-monotonic clock source : time might go backward
https://web.archive.org/web/20170103200607/https://blog.cloudflare.com/how-and-why-the-leap-second-affected-cloudflare-dns/ how not to use non-monotonic clock source : time might go backward