Time in Idaho

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Idaho is covered by two time zones, as described below. All locations observe daylight saving time.

The Pacific Time Zone (UTC-08:00, DST UTC-07:00) covers an area roughly coterminous with North Idaho:

The Mountain Time Zone (UTC-07:00, DST UTC-06:00) covers the rest of the state.

History

The 1918 Standard Time Act put most of Idaho into the Pacific Time Zone  only the very eastern parts were in the Mountain Time Zone.[1]

tz database

The tz database version 2012c contains two time zones for Idaho:

CC Coordinates TZ Comments UTC offset UTC offset DST Notes
US +340308-1181434 America/Los_Angeles Pacific Time −08:00 −07:00
US +433649-1161209 America/Boise Mountain Time - south Idaho & east Oregon −07:00 −06:00

References

  1. Prerau, David (2006). Seize the Daylight: The Curious and Contentious Story of Daylight Saving Time. p. 91. ISBN 978-1-56025-796-7. 
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