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A timestamp is a sequence of characters or encoded information identifying when a certain event occurred, usually giving date and time of day. Learn about the origin, standardization and usage of timestamps in various contexts, such as computer files, digital cameras and blockchain.
Unix time measures time by the number of non-leap seconds since 1970-01-01 00:00:00 UTC, which is called the Unix epoch. It is widely used in computing, but differs from UTC and TAI in handling leap seconds.
An epoch is a fixed date and time used as a reference for measuring system time in computing. Learn about the different epochs used by various software and systems, the problems and solutions related to time representation and overflow, and the satellite-based time systems.
Learn how timestamping is used in computing to provide a temporal order among events. Find out the applications of timestamping in network management, security, and concurrency control.
Coordinated Universal Time (UTC) is the primary time standard globally used to regulate clocks and time. It is based on atomic clocks and is not adjusted for daylight saving time. Learn about its history, uses, mechanism, and leap seconds.
Learn about the process of securely keeping track of the creation and modification time of a document, using digital signatures and hash functions. Find out the history, classification, standards and applications of trusted timestamping schemes.
Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, and into the future. Learn how time is measured, defined, and studied in various fields of science, philosophy, and religion.
The Time-Stamp Protocol, or TSP is a cryptographic protocol for certifying timestamps using X.509 certificates and public key infrastructure. The timestamp is the signer's assertion that a piece of electronic data existed at or before a particular time. The protocol is defined in RFC 3161.