Hi -
My DW-6600 went from 28th of Feb to 1st of March.
Then I had to re-adjust time by pressing the adjust button and moving to the date position and then pressing the decrease button (B button, upper right corner of watch) and date went to 29th of Feb without any issues or problems.
Speaking of 2039....Think of it as the Y2K of G-shocks....Well, esp. the DW-6600 ones... :disturbed: