Glossary of Datetime Concepts
Comprehensive reference for time-related terminology and concepts
All Terms
10 / 10UTC (Coordinated Universal Time)
The primary time standard by which the world regulates clocks and time.
GMT (Greenwich Mean Time)
The mean solar time at the Royal Observatory in Greenwich, London.
ISO 8601 (Date and Time Format)
International standard for representing dates and times.
Unix Timestamp
The number of seconds that have elapsed since January 1, 1970 (UTC).
Time Zone
A region of the globe that observes a uniform standard time for legal, commercial, and social purposes.
Daylight Saving Time (DST)
The practice of advancing clocks during summer months to extend evening daylight.
Leap Second
A one-second adjustment occasionally added to UTC to accommodate irregularities in Earth's rotation.
Atomic Time (TAI)
A high-precision time standard based on the oscillation of atoms.
Julian Date
A continuous count of days since noon Universal Time on January 1, 4713 BCE.
Epoch
A reference point in time used as the origin for a particular time measurement system.