History Rand McNally Standard Map of the United States, 1921, showing boundaries different from today It is the combination of the time zone and daylight saving rules, along with the timekeeping services, which determines the legal civil time for any U.S. The clocks run by these services are kept synchronized with each other as well as with those of other international timekeeping organizations. Official and highly precise timekeeping services (clocks) are provided by two federal agencies: the National Institute of Standards and Technology (NIST) (an agency of the Department of Commerce) and the United States Naval Observatory (USNO). The time zone boundaries and DST observance are regulated by the Department of Transportation, but no single map of those existed until the agency announced intentions to make one in September 2022. Convert timezones and find the best time for your meeting in
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