Maybe they assume people in German-speaking countries will be using the German build of the OS. Your list is missing major zones like "Vienna" and "Berlin"īased on your list, I wonder if it is a localisation thing. Some platforms may hide some minor zones by default, but that doesn't seem to be the case here. Pre-1970 data attempts to be accurate for the main city in the zone, but a zone will only be split if there is a post-1970 difference. So generally (there have been some exceptions surrounding historical countries that split) places in different countries will get different timezone names even if they have had the same local time since 1970.Įach zone is generally identified by its region and main city (there are some exceptions). The "TZ database" (used by pretty much every OS vendor except Microsoft) defines a timezone as a "national region where local clocks have all agreed since 1970". minimising the need for reconfiguration in the face of future changes to the definition of civil time.providing accurate conversions for historical timestamps.keeping the number of zones and overall DB size reasonable.It’s a very interesting read because it contains extensive research into the history of timekeeping on many states.ĭeciding what zones to have in a timezone database is a compromise between: You can download the data and see for yourself. Germany adopted the CE(S)T in 1980, while Switzerland did that a year later in 1981.īecause of how both the Netherlands and Belgium were affected by the First and Second World War and whatnot, their history is even longer, so I won’t include them here. Zone Europe/Berlin 0:53:28 - LMT 1893 Aprįirst and foremost, note how the last line is identical: Both use Central European (Summer) Time today. Rule SovietZone 1945 only - Nov 18 2:00s 0. Rule SovietZone 1945 only - May 24 2:00 2:00 M # Midsummer # occurred at 3:00 MEZ, not the 2:00 MEZ given in Shanks & Pottenger. Zone Europe/Zurich 0:34:08 - LMT 1853 Jul 16 # See above comment.Įurope/Berlin: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Europe/Zurich: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Büsingen is a German exclave entirely enclosed within Swiss territory. As an example, let’s look at the source code of the Europe/Busingen (actually a link to Europe/Zurich) and Europe/Berlin time zones. However, if you look at the past, you will find a lot of differences. If you only look at the present, many time zones will appear redundant.
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