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It's about time
- NTP, or Network Time Protocol, plays a crucial role in synchronizing time between computers for accurate timekeeping.
- NTP involves a sophisticated exchange of timestamps between client and server to calculate round-trip delay and time offset for clock synchronization.
- Round-trip delay is calculated considering timestamps measured on the client and server sides to account for network latency.
- Time offset determines the difference between the client's clock and the server's clock, correcting the client's time accordingly.
- NTP clients utilize statistical algorithms, slewing, and stepping mechanisms to maintain time synchronization gradually and accurately.
- Slewing involves adjusting the clock speed to match the correct time gradually, ensuring smooth timekeeping without sudden jumps.
- Stepping, on the other hand, entails an instant adjustment of the system clock to the accurate time for significant differences.
- Developers must understand whether their application uses wall-clock time or monotonic clock for reliable time measurement, especially during adjustments.
- Using monotonic clocks for measuring time intervals is recommended to avoid inaccuracies caused by NTP corrections or adjustments.
- Java provides System.nanoTime() for accessing a monotonic clock source, offering nanosecond precision for reliable time measurements.
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