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On November 18, 1883 the General Time Convention established this in North America.

  • Daylight Savings Time
  • The five time zones
  • The Gregorian calendar
  • Universal Mean Time

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    HistoryNet Staff (3/1/2026) Daily Quiz for August 21, 2018. HistoryNet Retrieved from https://historynet.com/quiz180821/.
    "Daily Quiz for August 21, 2018."HistoryNet Staff - 3/1/2026, https://historynet.com/quiz180821/
    HistoryNet Staff 8/21/2018 Daily Quiz for August 21, 2018., viewed 3/1/2026,<https://historynet.com/quiz180821/>
    HistoryNet Staff - Daily Quiz for August 21, 2018. [Internet]. [Accessed 3/1/2026]. Available from: https://historynet.com/quiz180821/
    HistoryNet Staff. "Daily Quiz for August 21, 2018." HistoryNet Staff - Accessed 3/1/2026. https://historynet.com/quiz180821/
    "Daily Quiz for August 21, 2018." HistoryNet Staff [Online]. Available: https://historynet.com/quiz180821/. [Accessed: 3/1/2026]