You'll need some sort of intermediary (e.g., a BASIC Stamp) between the PC and the DS1302. The PC would send a message to the Stamp which would then sett the current time into the DS1302.
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔ Jon Williams Applications Engineer, Parallax
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Jon Williams
Applications Engineer, Parallax