Buy a fake 3G base / repeater and use it to set the clock? Such devices with an ethernet port exist. About $2000, so cheaper to sell the DX and by a new 7" or 8" eink, which is far better for PDFs and ebooks.
No other solution for a DX or DXG with 3G only and no local 3G.
It takes a day for the time and date to recover on my DXG if it goes flat. There might be some jail break. I only managed to change system fonts and sleep cover on mine. USB networking to set time and date failed.
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