When a system's clock begins to be off by a few seconds or even minutes is know as Time Drift
Delay in Time (NTP) Time drift occurs when your server's time does not agree with an authorized time source, such as ntp.org. This issue occurs progressively over weeks and months and is exceedingly frequent. Compare the server's current date and time to The Official NIST Time to quickly check for time drift.
Your applications will all run on the same time and avoid these issues if your servers are synced using a shared time server. A daemon called NTP (Network Time Protocol) modifies the server's clock inconspicuously and briefly to prevent time drift.
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