West Coast Works Come to the East End.

''Pacific Standard Time: Art in L.A., 1945-1980,'' an aggregation of dozens of exhibitions at museums and galleries that got under way in Southern California last fall, celebrates the emergence of Los Angeles as a contemporary art center after World War II. On the East Coast, meanwhile, a much more modest show, drawn from the collection of a single art patron, pays homage to the same phenomenon. That show, ''EST-3: Southern California in New York: Los Angeles Art From the Beth Rudin DeWoody Collection,'' is at the Parrish Art Museum in Southampton. It riffs on the same time-zone theme -- EST-3 refers to Eastern Standard Time minus three -- and includes more than 150 works arranged into three simple sections -- people, places and things -- by David Pagel, a Los Angeles-based adjunct curator for the museum. [ABSTRACT FROM AUTHOR]