Browse Definitions:
Definition

Daylight Saving Time (DST)

Daylight Saving Time (DST) is the practice of turning the clock ahead as warmer weather approaches and back as it becomes colder again so that people will have one more hour of daylight in the afternoon and evening during the warmer season of the year. (Some believe that it should be called Daylight Shifting Time because no daylight is actually "saved.") Daylight Saving Time varies somewhat from country to country. Countries in equatorial and tropical climates do not observe Daylight Saving Time. The months when the clock is set ahead and back differ between northern and southern hemispheres.

The U.S. Energy Policy Act of 2005 mandated changes to Daylight Saving Time, extending it three weeks earlier in the spring and one week later in the fall. Starting March 11, 2007 clocks spring ahead an hour on the second Sunday in March and fall back on the first Sunday in November. The assumption behind the change was that it would decrease the need for artificial light sources and, as a result, save energy.

As reported by SearchCIO.com, many admins are waiting until the last minute to patch systems . Time discrepancies could cause scheduling and synchronization problems for unpatched operating systems, applications and devices. Indirectly, those changes may also affect not only systems in these areas but also any systems that interact with them. To address the issue, Microsoft and other software makers issued Daylight Saving Time patch es.

Here are a few of the world's variations in observing Daylight Saving Time:

  • In most of North America, clocks are set forward one hour on the second Sunday in March and back on the first Sunday in November.
  • The state of Arizona in the U.S. does not observe Daylight Saving Time. However, the large Navajo Reservation in northeastern Arizona does observe it.
  • In non-equatorial Brazil, DST starts the first Sunday in November and ends the third Sunday in February.
  • In the European Union, DST starts the last Sunday in March at 1 am UTC and ends the last Sunday in October at the same time.
  • In Russia, the clock is set ahead beginning the last Sunday in March at 2 am local time and set back the last Sunday in October at the same time. Because the clock is already set an hour ahead of standard time, Russians effectively have two more hours of daylight in the summer.
  • In Israel and the area of Palestine, Daylight Saving Time is observed, but the time of change is decided every year. Israel and the Authority of Palestine sometimes have different start and end dates.
  • Jordan has Daylight Saving Time all year.
  • Australia's DST starts the last Sunday in October and ends the last Sunday in March. However, Tasmania's DST starts the first Sunday in October along with New Zealand and ends the last Sunday in March. New Zealand ends the third Sunday in March.
This was last updated in March 2011

Continue Reading About Daylight Saving Time (DST)

Join the conversation

2 comments

Send me notifications when other members comment.

By submitting you agree to receive email from TechTarget and its partners. If you reside outside of the United States, you consent to having your personal data transferred to and processed in the United States. Privacy

Please create a username to comment.

Thanks for the nice article.

-Ranadheer
Cancel
Note in Australia DST is determined by the states and not all states implement DST or implement the same dates. For example along the east coast (one timezone in winter), we have Victoria and NSW who are in synch, Tasmania who run DST to different dates as mentioned above, and Queensland who doesn't have daylight savings.
Cancel

-ADS BY GOOGLE

File Extensions and File Formats

Powered by:

SearchCompliance

  • PCAOB (Public Company Accounting Oversight Board)

    The Public Company Accounting Oversight Board (PCAOB) is a Congressionally-established nonprofit that assesses audits of public ...

  • cyborg anthropologist

    A cyborg anthropologist is an individual who studies the interaction between humans and technology, observing how technology can ...

  • RegTech

    RegTech, or regulatory technology, is a term used to describe technology that is used to help streamline the process of ...

SearchSecurity

  • email spam

    Email spam, or junk email, is unsolicited bulk messages sent through email with commercial, fraudulent or malicious intent.

  • distributed denial of service (DDoS) attack

    A distributed denial-of-service attack occurs when an attack originates from multiple computers or devices, usually from multiple...

  • application whitelisting

    Application whitelisting is the practice of identifying applications that have been deemed safe for execution and restricting all...

SearchHealthIT

  • athenahealth Inc.

    Based in Watertown, Mass., athenahealth Inc. is a leading vendor of cloud-based EHRs for small to medium-sized physician ...

  • Affordable Care Act (ACA or Obamacare)

    The Affordable Care Act (ACA) is legislation passed in 2010 that changed how uninsured Americans enroll in and receive healthcare...

  • HIPAA Privacy Rule

    The Standards for Privacy of Individually Identifiable Health Information, commonly known as the HIPAA Privacy Rule, establishes ...

SearchDisasterRecovery

  • disaster recovery as a service (DRaaS)

    One approach to a strong disaster recovery plan is DRaaS, where companies offload data replication and restoration ...

  • data recovery

    Data recovery restores data that has been lost, accidentally deleted, corrupted or made inaccessible. Learn how data recovery ...

  • disaster recovery plan (DRP)

    A company's disaster recovery policy is enhanced with a documented DR plan that formulates strategies, and outlines preparation ...

SearchStorage

  • yottabyte (YB)

    A yottabyte is a measure of theoretical storage capacity and is 2 to the 80th power bytes, or, in decimal, approximately 1,000 ...

  • Kilo, mega, giga, tera, peta, exa, zetta and all that

    Kilo, mega, giga, tera, peta, exa, zetta are among the list of prefixes used to denote the quantity of something, such as a byte ...

  • brontobyte

    A brontobyte is a measure of memory or data storage that is equal to 10 to the 27th power of bytes.

SearchSolidStateStorage

  • SSD caching

    SSD caching, also known as flash caching, is the temporary storage of data on NAND flash memory chips in a solid-state drive so ...

  • NVDIMM (Non-Volatile Dual In-line Memory Module)

    An NVDIMM (non-volatile dual in-line memory module) is hybrid computer memory that retains data during a service outage.

  • NAND mirroring

    NAND mirroring has been proposed to break the security in certain portable devices that use NAND flash memory for encryption.

SearchCloudStorage

  • RESTful API

    A RESTful application program interface breaks down a transaction to create a series of small modules, each of which addresses an...

  • cloud storage infrastructure

    Cloud storage infrastructure is the hardware and software framework that supports the computing requirements of a private or ...

  • Zadara VPSA and ZIOS

    Zadara Storage provides block, file or object storage with varying levels of compute and capacity through its ZIOS and VPSA ...

Close