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The part of Idaho south of the Salmon River switched from Pacific Standard Time (UTC-8) to Mountain Standard Time (UTC-7) on May 13, 1923. Since then there were nineteen times when the time throughout the state was the same for more than an hour due to the northern part being on Pacific Daylight Saving Time while the southern part was on Mountain Standard Time, both of which are UTC-7:

  • 14 March 1948 - 1 January 1949
  • 30 April 1950 - 24 September 1950
  • 29 April 1951 - 30 September 1951
  • 27 April 1952 - 28 September 1952
  • 26 April 1953 - 27 September 1953
  • 25 April 1954 - 26 September 1954
  • 24 April 1955 - 25 September 1955
  • 29 April 1956 - 30 September 1956
  • 28 April 1957 - 29 September 1957
  • 27 April 1958 - 28 September 1958
  • 26 April 1959 - 27 September 1959
  • 24 April 1960 - 25 September 1960
  • 30 April 1961 - 24 September 1961
  • 29 April 1962 - 28 October 1962
  • 28 April 1963 - 27 October 1963
  • 26 April 1964 - 25 October 1964
  • 25 April 1965 - 31 October 1965
  • 24 April 1966 - 30 October 1966
  • 6 January 1974 - 3 February 1974
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Q: When did Idaho's time zone split?
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