Home > Time Zones > Daylight Saving Time > Preliminary Dates for DST Switches

Preliminary Dates for DST Switches

In most countries, the Daylight Savings Time schedule has been very stable in the past, so the dates and times of future DST switches are unlikely to change.

Confusion over Daylight Saving Time in Australia and New Zealand
Clocks are set 1 hour back during DST.
©iStockphoto.com/Luca di Filippo

In most countries, the Daylight Savings Time schedule has been very stable in the past, so the dates and times of future DST switches are unlikely to change. However, in some cases there is reason to believe that the schedule may be altered in the near future. In these cases, the dates are marked as preliminary in our overview of past and future DST switches.

When is a DST date preliminary?

timeanddate.com keeps a close eye on current political decision processes, public debates, and the time zone history in countries worldwide. Future DST switches are deemed preliminary if:

  • there have been recent changes to the laws stipulating DST switches (e.g. Jordan)
  • there are clear signals in the political and public debate that these laws may be changed soon (e.g. Israel)
  • the country has a recent history of several changes in the DST legislation (e.g. Russia)
  • there are unconfirmed reports about upcoming changes but it is difficult to obtain reliable information from official sources (e.g. Tokelau)
  • the government announces DST switch dates and times at very short notice (e.g. Palestinian territories)
  • the information flow between government and population about a recent change in legislation is inadequate and most people still follow the old rules (e.g. Nagorno Karabakh)
  • there is political turmoil expected to hamper decision processes and reliable information flows, or unsettling a political balance in favor of alterations in the DST legislation
  • the country suspends DST during the Muslim month of Ramadan (e.g. Morocco)

Other countries with preliminary DST dates include:

Please note: Non-preliminary DST switches can also change at short notice.

Stay up to date

Check our Time Zone News and subscribe to our RSS feed to receive up-to-date information about DST and time zone switches. Recent Time Zone News are also listed in our free monthly Newsletter.

If you have information about a DST switch that is listed as a preliminary date please let us know.

Create Calendar with Holidays


You might also like

UK on BST in the Summer

Contrary to ideas that the United Kingdom is on Greenwich Mean Time (GMT) all year, it actually observes British Summer Time (BST), which is one hour ahead of GMT, during the summer months. more

Business watch and one hundred dollar bill

The History of DSTDaylight Savings Time

The concept of Daylight Saving Time (DST) has not been without controversy. It was first introduced by US inventor and politician Benjamin Franklin in 1784, and is now in use in countries all over the world. more

Autumn in the city park with clock.

Set the clock 1 hour back or forward?

Spring forward – fall back is just one of the expressions used to remember whether to set the clock one hour forward or one hour back for the start and end of Daylight Saving Time (DST). more