# NTP Timestamp Calculations

**URL:** <https://community.nwtime.org/t/ntp-timestamp-calculations/245>\
**Category:** Dave Mills Library\
**Created:** [February 11, 2026, 7:31pm UTC](https://community.nwtime.org/t/ntp-timestamp-calculations/245 "2026-02-11T19:31:36Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Dru](https://sea1.discourse-cdn.com/flex001/user_avatar/community.nwtime.org/dru/32/337_2.png) [@Dru](https://community.nwtime.org/u/Dru)\
**Post date:** [February 11, 2026, 7:31pm UTC](https://community.nwtime.org/t/ntp-timestamp-calculations/245/1 "2026-02-11T19:31:36Z")

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> **[NTP Timestamp Calculations](https://www.ntp.org/reflib/time/)**
>
> This document presents a mathematical analysis of the principles of clock offset and roundtrip delay calculations used by NTP. The analysis is based on the properties of finite additive groups using two’s complement arithmetic. An important...