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Reference.org
Timestamp
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<p>A timestamp is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day, sometimes accurate to a small fraction of a second. Timestamps do not have to be based on some absolute notion of time, however. They can have any epoch, can be relative to any arbitrary time, such as the power-on time of a system, or to some arbitrary time in the past. </p><p>A distinction is sometimes made between the terms datestamp, timestamp and date-timestamp: </p> <ul><li>Datestamp or DS: A date, for example 2025-05-17 according to <a href="/facts/ISO_8601/4N8kykG9">ISO 8601</a></li> <li>Timestamp or TS: A time of day, for example 17:11:33 using <a href="/facts/24-hour_clock/25MX89DX">24-hour clock</a></li> <li>Date-timestamp or DTS: Date and time, for example 2025-05-17, 17:11:33</li></ul>