Historically distinct IANA time zone
Europe/Prague
- Countries
- Czech Republic
- GPS reference
- 50.08° N, 14.43° E
- Data source
- IANA europe
- Aliases
- None
Czech RepublicGeographic context
Where this clock belongs
The map marks the IANA reference location and associated country, not a time-zone boundary.
GPS reference: 50.08° N, 14.43° E. Associated countries: CZ.
The Wikipedia link provides additional context; it is not evidence for a historical claim. Transition data comes from the IANA source file.
Notes from the time database
The story behind the clock
These source notes describe a period or rule. They do not, by themselves, establish a causal claim for a particular clock change.
Czech Republic (Czechia) Slovakia (This is an official link to the Czechoslovak Summer Time Act of March 8, 1946 that authorizes the Czechoslovak government to set the exact dates of change to summer time and back to Central European Time. The act also implicitly confirms Central European Time as the official time zone of Czechoslovakia and currently remains in force in both the Czech Republic and Slovakia.) (This is a link to the original legislative proposal dating back to February 22, 1946. The accompanying memorandum to the proposal says that an advisory committee on European railroad transportation that met in Brussels in October 1945 decided that the change of time should be carried out in all participating countries in a strictly coordinated manner....) The source for Czech data is: Kdy začíná a končí letní čas. Its main text disagrees with its quoted sources only in 1918, where the main text says spring and autumn transitions occurred at 02:00 and 03:00 respectively (as usual), whereas the 1918 source "Oznámení o zavedení letního času v roce 1918" The tzdata source notes: 00 and 02:00 respectively. As the 1918 source appears to be a humorous piece, and it is unlikely that Prague would have disagreed with its neighbors by an hour, go with the main text for now. We know of no English-language name for historical Czech winter time; abbreviate it as "GMT", as it happened to be GMT.
Older C-Eur rules are for convenience in the tables. From 1977 on, C-Eur differs from EU only in that C-Eur uses standard time.
The following rules are for the European Union and for its predecessor organization, the European Communities. For brevity they are called "EU rules" elsewhere in this file.
Original IANA source file: europe.
A shared present
Same clock today, different past
These nearby zones follow the same current annual pattern, yet retain their own historical record.
Austria · 249 km from the reference location · Same annual clock since 1981
Germany · 279 km from the reference location · Same annual clock since 1980
Hungary · 445 km from the reference location · Same annual clock since 1984Civil-time record
Recorded changes over time
From 1850 to 2027 · 124 recorded transitions
Recurring daylight-saving changes are grouped separately when JavaScript is available.
Notable changes
One-off changes and transitions outside the recurring seasonal rhythm.
- +00:57 · PMTStandard time applies
- +01:00 · CETStandard time applies
- +02:00 · CESTDaylight saving time begins
- +01:00 · CETStandard time applies
- +02:00 · CESTDaylight saving time begins
- +01:00 · CETStandard time applies
Browse every recorded transition
| Local time after transition | Offset after | Abbreviation | Rule |
|---|---|---|---|
| 1850-01-01 00:00 | +00:57 | PMT | Standard time |
| 1891-10-01 00:02 | +01:00 | CET | Standard time |
| 1916-05-01 00:00 | +02:00 | CEST | Daylight saving time |
| 1916-10-01 00:00 | +01:00 | CET | Standard time |
| 1917-04-16 03:00 | +02:00 | CEST | Daylight saving time |
| 1917-09-17 02:00 | +01:00 | CET | Standard time |
| 1918-04-15 03:00 | +02:00 | CEST | Daylight saving time |
| 1918-09-16 02:00 | +01:00 | CET | Standard time |
| 1940-04-01 03:00 | +02:00 | CEST | Daylight saving time |
| 1942-11-02 02:00 | +01:00 | CET | Standard time |
| 1943-03-29 03:00 | +02:00 | CEST | Daylight saving time |
| 1943-10-04 02:00 | +01:00 | CET | Standard time |
| 1944-04-03 03:00 | +02:00 | CEST | Daylight saving time |
| 1944-10-02 02:00 | +01:00 | CET | Standard time |
| 1945-04-02 03:00 | +02:00 | CEST | Daylight saving time |
| 1945-10-01 02:00 | +01:00 | CET | Standard time |
| 1946-05-06 03:00 | +02:00 | CEST | Daylight saving time |
| 1946-10-06 02:00 | +01:00 | CET | Standard time |
| 1946-12-01 02:00 | +00:00 | GMT | Daylight saving time |
| 1947-02-23 03:00 | +01:00 | CET | Standard time |
| 1947-04-20 03:00 | +02:00 | CEST | Daylight saving time |
| 1947-10-05 02:00 | +01:00 | CET | Standard time |
| 1948-04-18 03:00 | +02:00 | CEST | Daylight saving time |
| 1948-10-03 02:00 | +01:00 | CET | Standard time |
| 1949-04-09 03:00 | +02:00 | CEST | Daylight saving time |
| 1949-10-02 02:00 | +01:00 | CET | Standard time |
| 1979-04-01 03:00 | +02:00 | CEST | Daylight saving time |
| 1979-09-30 02:00 | +01:00 | CET | Standard time |
| 1980-04-06 03:00 | +02:00 | CEST | Daylight saving time |
| 1980-09-28 02:00 | +01:00 | CET | Standard time |
| 1981-03-29 03:00 | +02:00 | CEST | Daylight saving time |
| 1981-09-27 02:00 | +01:00 | CET | Standard time |
| 1982-03-28 03:00 | +02:00 | CEST | Daylight saving time |
| 1982-09-26 02:00 | +01:00 | CET | Standard time |
| 1983-03-27 03:00 | +02:00 | CEST | Daylight saving time |
| 1983-09-25 02:00 | +01:00 | CET | Standard time |
| 1984-03-25 03:00 | +02:00 | CEST | Daylight saving time |
| 1984-09-30 02:00 | +01:00 | CET | Standard time |
| 1985-03-31 03:00 | +02:00 | CEST | Daylight saving time |
| 1985-09-29 02:00 | +01:00 | CET | Standard time |
| 1986-03-30 03:00 | +02:00 | CEST | Daylight saving time |
| 1986-09-28 02:00 | +01:00 | CET | Standard time |
| 1987-03-29 03:00 | +02:00 | CEST | Daylight saving time |
| 1987-09-27 02:00 | +01:00 | CET | Standard time |
| 1988-03-27 03:00 | +02:00 | CEST | Daylight saving time |
| 1988-09-25 02:00 | +01:00 | CET | Standard time |
| 1989-03-26 03:00 | +02:00 | CEST | Daylight saving time |
| 1989-09-24 02:00 | +01:00 | CET | Standard time |
| 1990-03-25 03:00 | +02:00 | CEST | Daylight saving time |
| 1990-09-30 02:00 | +01:00 | CET | Standard time |
| 1991-03-31 03:00 | +02:00 | CEST | Daylight saving time |
| 1991-09-29 02:00 | +01:00 | CET | Standard time |
| 1992-03-29 03:00 | +02:00 | CEST | Daylight saving time |
| 1992-09-27 02:00 | +01:00 | CET | Standard time |
| 1993-03-28 03:00 | +02:00 | CEST | Daylight saving time |
| 1993-09-26 02:00 | +01:00 | CET | Standard time |
| 1994-03-27 03:00 | +02:00 | CEST | Daylight saving time |
| 1994-09-25 02:00 | +01:00 | CET | Standard time |
| 1995-03-26 03:00 | +02:00 | CEST | Daylight saving time |
| 1995-09-24 02:00 | +01:00 | CET | Standard time |
| 1996-03-31 03:00 | +02:00 | CEST | Daylight saving time |
| 1996-10-27 02:00 | +01:00 | CET | Standard time |
| 1997-03-30 03:00 | +02:00 | CEST | Daylight saving time |
| 1997-10-26 02:00 | +01:00 | CET | Standard time |
| 1998-03-29 03:00 | +02:00 | CEST | Daylight saving time |
| 1998-10-25 02:00 | +01:00 | CET | Standard time |
| 1999-03-28 03:00 | +02:00 | CEST | Daylight saving time |
| 1999-10-31 02:00 | +01:00 | CET | Standard time |
| 2000-03-26 03:00 | +02:00 | CEST | Daylight saving time |
| 2000-10-29 02:00 | +01:00 | CET | Standard time |
| 2001-03-25 03:00 | +02:00 | CEST | Daylight saving time |
| 2001-10-28 02:00 | +01:00 | CET | Standard time |
| 2002-03-31 03:00 | +02:00 | CEST | Daylight saving time |
| 2002-10-27 02:00 | +01:00 | CET | Standard time |
| 2003-03-30 03:00 | +02:00 | CEST | Daylight saving time |
| 2003-10-26 02:00 | +01:00 | CET | Standard time |
| 2004-03-28 03:00 | +02:00 | CEST | Daylight saving time |
| 2004-10-31 02:00 | +01:00 | CET | Standard time |
| 2005-03-27 03:00 | +02:00 | CEST | Daylight saving time |
| 2005-10-30 02:00 | +01:00 | CET | Standard time |
| 2006-03-26 03:00 | +02:00 | CEST | Daylight saving time |
| 2006-10-29 02:00 | +01:00 | CET | Standard time |
| 2007-03-25 03:00 | +02:00 | CEST | Daylight saving time |
| 2007-10-28 02:00 | +01:00 | CET | Standard time |
| 2008-03-30 03:00 | +02:00 | CEST | Daylight saving time |
| 2008-10-26 02:00 | +01:00 | CET | Standard time |
| 2009-03-29 03:00 | +02:00 | CEST | Daylight saving time |
| 2009-10-25 02:00 | +01:00 | CET | Standard time |
| 2010-03-28 03:00 | +02:00 | CEST | Daylight saving time |
| 2010-10-31 02:00 | +01:00 | CET | Standard time |
| 2011-03-27 03:00 | +02:00 | CEST | Daylight saving time |
| 2011-10-30 02:00 | +01:00 | CET | Standard time |
| 2012-03-25 03:00 | +02:00 | CEST | Daylight saving time |
| 2012-10-28 02:00 | +01:00 | CET | Standard time |
| 2013-03-31 03:00 | +02:00 | CEST | Daylight saving time |
| 2013-10-27 02:00 | +01:00 | CET | Standard time |
| 2014-03-30 03:00 | +02:00 | CEST | Daylight saving time |
| 2014-10-26 02:00 | +01:00 | CET | Standard time |
| 2015-03-29 03:00 | +02:00 | CEST | Daylight saving time |
| 2015-10-25 02:00 | +01:00 | CET | Standard time |
| 2016-03-27 03:00 | +02:00 | CEST | Daylight saving time |
| 2016-10-30 02:00 | +01:00 | CET | Standard time |
| 2017-03-26 03:00 | +02:00 | CEST | Daylight saving time |
| 2017-10-29 02:00 | +01:00 | CET | Standard time |
| 2018-03-25 03:00 | +02:00 | CEST | Daylight saving time |
| 2018-10-28 02:00 | +01:00 | CET | Standard time |
| 2019-03-31 03:00 | +02:00 | CEST | Daylight saving time |
| 2019-10-27 02:00 | +01:00 | CET | Standard time |
| 2020-03-29 03:00 | +02:00 | CEST | Daylight saving time |
| 2020-10-25 02:00 | +01:00 | CET | Standard time |
| 2021-03-28 03:00 | +02:00 | CEST | Daylight saving time |
| 2021-10-31 02:00 | +01:00 | CET | Standard time |
| 2022-03-27 03:00 | +02:00 | CEST | Daylight saving time |
| 2022-10-30 02:00 | +01:00 | CET | Standard time |
| 2023-03-26 03:00 | +02:00 | CEST | Daylight saving time |
| 2023-10-29 02:00 | +01:00 | CET | Standard time |
| 2024-03-31 03:00 | +02:00 | CEST | Daylight saving time |
| 2024-10-27 02:00 | +01:00 | CET | Standard time |
| 2025-03-30 03:00 | +02:00 | CEST | Daylight saving time |
| 2025-10-26 02:00 | +01:00 | CET | Standard time |
| 2026-03-29 03:00 | +02:00 | CEST | Daylight saving time |
| 2026-10-25 02:00 | +01:00 | CET | Standard time |
| 2027-03-28 03:00 | +02:00 | CEST | Daylight saving time |
| 2027-10-31 02:00 | +01:00 | CET | Standard time |