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daylight-saving time

B2
UK/ˌdeɪ.laɪt ˈseɪ.vɪŋ ˌtaɪm/US/ˌdeɪ.laɪt ˈseɪ.vɪŋ ˌtaɪm/

Neutral to formal. Often abbreviated to DST in writing and informal speech.

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Definition

Meaning

A system where clocks are set forward one hour in spring and back in autumn to extend evening daylight.

The specific period during which this system is in effect; the practice itself, often implemented to conserve energy or promote outdoor activity.

Linguistics

Semantic Notes

Often hyphenated ('daylight-saving time') but also found as 'daylight saving time' without a hyphen. It is a system, not a specific moment. Usually contrasted with 'standard time'.

Dialectal Variation

British vs American Usage

Differences

UK: 'Summer Time' is the official term for DST (British Summer Time - BST). US: 'Daylight Saving Time' is standard. Abbreviation 'DST' is common in both. UK uses the plural 'savings' less frequently than US.

Connotations

Neutral to slightly bureaucratic/technical in both. Can be a topic of public debate regarding its usefulness.

Frequency

Slightly more frequent in US discourse due to state-level variations (e.g., Arizona, Hawaii do not observe). In UK, 'BST' is equally or more frequent.

Vocabulary

Collocations

strong
observe daylight-saving timestart of daylight-saving timeend of daylight-saving timeduring daylight-saving time
medium
daylight-saving time beginsdaylight-saving time endsdaylight-saving time scheduleswitch to daylight-saving time
weak
daylight-saving time changedaylight-saving time debatedaylight-saving time adjustmentpermanent daylight-saving time

Grammar

Valency Patterns

[Subject: government/country/state] observes daylight-saving time.Daylight-saving time starts on [date].Remember to [verb: set/change] your clocks for daylight-saving time.

Vocabulary

Synonyms

Strong

daylight time

Neutral

summer timeDST

Weak

the time changethe clock shift

Vocabulary

Antonyms

standard timewinter time

Phrases

Idioms & Phrases

  • “spring forward, fall back”

Usage

Context Usage

Business

Used in scheduling, especially for international coordination across time zones affected differently by DST.

Academic

Discussed in economics (energy consumption), sociology (health/behavioural impacts), and public policy.

Everyday

Used when discussing plans, sleep schedules, or adjusting clocks on appliances.

Technical

Used in software development (timezone handling), aviation, and logistics.

Examples

By Part of Speech

verb

British English

  • The UK will revert to GMT when it comes off summer time.
  • We don't change our clocks; we don't practise daylight saving.

American English

  • Congress debated whether to make daylight saving permanent.
  • Most states daylight-save, but Arizona does not.

adverb

British English

  • Not applicable as a standalone adverb.

American English

  • Not applicable as a standalone adverb.

adjective

British English

  • The daylight-saving period ends in late October.
  • Check the daylight-saving transition dates.

American English

  • The daylight-saving time change disrupts sleep patterns.
  • She missed the meeting due to a daylight-saving clock error.

Examples

By CEFR Level

A2
  • In summer, we have daylight-saving time.
  • My clock is wrong because of daylight-saving time.
B1
  • Daylight-saving time starts next Sunday, so don't forget to set your clocks forward.
  • I prefer daylight-saving time because it stays lighter in the evenings.
B2
  • The proposal to abolish daylight-saving time was rejected by the parliamentary committee.
  • Coordinating calls with our Australian office is more complex during their daylight-saving period, which differs from ours.
C1
  • Proponents argue that daylight-saving time marginally reduces energy consumption in the residential sector, though meta-analyses show contradictory results.
  • The biannual shift imposed by daylight-saving time has been correlated with a transient increase in traffic accidents and myocardial infarctions.

Learning

Memory Aids

Mnemonic

DAYLIGHT-SAVING: You SAVE daylight for the evening by shifting the clock. Think: 'We SAVE the bright daylight hours for later in the day.'

Conceptual Metaphor

TIME IS A RESOURCE (that can be saved or shifted).

Watch out

Common Pitfalls

Translation Traps (for Russian speakers)

  • Do not translate word-for-word as 'дневной свет сберегающее время'. The standard Russian term is 'летнее время'.
  • Avoid confusing 'daylight-saving time' (система) with 'летний час' (less common).

Common Mistakes

  • Incorrect: 'daylight-savings time' (though common in casual US speech). Correct: 'daylight-saving time'.
  • Incorrect: 'We have a daylight-saving time now.' Correct: 'Daylight-saving time is in effect now.' or 'We are on daylight-saving time.'

Practice

Quiz

Fill in the gap
Don't be late for the flight; remember that begins tonight and the clocks go forward.
Multiple Choice

What is the primary stated purpose of daylight-saving time?

FAQ

Frequently Asked Questions

The correct formal term is 'daylight-saving time' (singular 'saving'). However, 'daylight savings time' is a very common informal variant, especially in American English.

No, many countries near the equator do not, as daylight hours are consistent year-round. Some major countries, like most of China and India, also do not observe it.

It is called 'standard time' or, in some contexts, 'winter time'.

Debate centres on its actual energy savings, which are now minimal with modern lighting and climate control, and its negative impacts on health (sleep disruption) and safety (brief increase in accidents after the spring shift).