City history
From the indigenous Yelamu settlement and Spanish colonial mission to the 1883 Pacific Standard Time adoption and Ferry Building clock tower, San Francisco's timekeeping history reflects its growth as a Pacific gateway.
Chapter one
Indigenous name
"Western People"
Before European colonization, the Yelamu tribelet of the Ramaytush-speaking Ohlone people inhabited the northern end of the San Francisco Peninsula. They lived in seasonal villages including Chutchui, Sitlintac, Amuctac, and Petlenuc.
Western People
Refers to the Ramaytush-speaking Ohlone tribelet who inhabited the northern end of the San Francisco Peninsula prior to Spanish missionization.
Mission of Our Father Saint Francis of Assisi
Founded by Spanish Franciscan missionaries led by Father Francisco Palóu under Juan Bautista de Anza's expedition, named after Saint Francis of Assisi.
Good Herb
Established as a civilian pueblo near Yerba Buena Cove by William A. Richardson, named after the aromatic wild mint growing abundantly on local hills.
Saint Francis
Officially decreed on January 30, 1847, by American Alcalde Washington A. Bartlett to align the pueblo's name with San Francisco Bay and secure civic recognition.
Chapter two
On November 18, 1883, San Francisco adjusted its clocks from local mean solar time (UTC-8:09:38) to Pacific Standard Time (UTC-8) under the nationwide railroad synchronization plan.
San Francisco observed nationwide Daylight Saving Time under the Standard Time Act of 1918 to conserve fuel during World War I, advancing clocks one hour until federal repeal in 1919.
San Francisco observed continuous year-round daylight saving time, designated as Pacific War Time (UTC-7), from February 1942 through September 1945 to reduce wartime electricity demands.
California voters approved Proposition 12 in November 1949, establishing annual statewide Daylight Saving Time observance across San Francisco from spring through autumn.
The federal Uniform Time Act established consistent start and end dates for Daylight Saving Time across California, bringing uniformity to San Francisco timekeeping.
Chapter three
A time ball was erected atop Telegraph Hill to drop precisely at noon, enabling ships anchored in San Francisco Bay to adjust their marine chronometers for navigation.
Lick Observatory began transmitting precise astronomical time signals via telegraph to San Francisco, establishing an accurate standard for local clocks and railways.
The San Francisco Ferry Building opened with a 245-foot tower housing a massive E. Howard & Co. clock mechanism, serving as the focal point for daily bay transit.
The great April 18, 1906 earthquake stopped mechanical clocks across San Francisco at 5:12 AM, creating a physical monument of the exact minute disaster struck.