Wow, imagine if instead we all asked, "Hey, what's your Milpitas date?" Interesting that they went with 'San Jose'.
It's funny you mention this, as it seems that wasn't incorporated until 1954. But, I think that Wikipedia does a better job explaining:
"On January 26, 1954, faced with getting swallowed up by a rapidly expanding San Jose, Milpitas residents incorporated as a city that included the recently built Ford Auto Assembly plant. When San Jose attempted to annex Milpitas barely seven years later, the "Milpitas Minutemen" were quickly organized to oppose annexation and keep Milpitas independent. An overwhelming majority of Milpitas registered voters voted "No" to annexation in the 1961 election as a result of a vigorous anti-annexation campaign. Following the election, the anti-annexation committee, who had compared themselves to the Revolutionary War Minutemen who fought the British on Lexington Green—a role filled in this case by the neighboring city of San Jose - adopted the image of Daniel Chester French's Minuteman statue, that stands near the site of the Old North Bridge in Concord, MA, as part of the official city seal."
There was drama even back then.