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Astral Atlas
Wiki concept · Time & location

Daylight saving time

Also called DST

A seasonal legal clock adjustment whose dates and rules depend on place and year.

In this entry

Word origin · etymology

Descriptive policy name.

Saving refers to shifting usable daylight into later clock hours. The phrase names a clock arrangement, not additional astronomical daylight.

Merriam-Webster: daylight saving time ↗

How we know · epistemology

Legal clock convention

Seasonal clock changes are institutional decisions documented by place and year. They are not corrections for the Sun’s actual position, and one country’s schedule cannot stand in for another’s.

IANA: time-zone database ↗

Connected concepts

Read alongside this entry

These links connect subjects and terminology. They do not establish a shared historical origin.

Sources & provenance

Use the citations beside each section to distinguish a calculation convention, a historical teaching and an editorial example.

Find these sources across the wiki →

  1. IANA: time-zone database ↗
  2. Merriam-Webster: daylight saving time ↗