I dont know how to change the time on my decathlon geonaute watch
I nearly went crazy pushing buttons, but finally got the right combination. From the normal Time Display (as you would normally use the watch, no need to push any buttons) Push and Hold for a few seconds the Lap/Reset Button. The "Set" Mode will become active. Release the Lap/Reset button when Set appears in the Display. Notice in the Display a small Arrow that points to a button, either the ST/STP or Mode Button. (Initially it will be the ST/STP Button). When you depress the button to which the arrow points, the Field Flashing in the display will be set (For ST/STP) or Changed to the next Field (When the Arrow Points to the Mode Button). Simply toggle through the fields (using the Mode Button) and set (using the ST/STP Button) as needed. You will also be offered the ability to set the Month, Date, Day, 12/24 HR, and a M-D (It stands for Month - Date, in Europe it's more common to display as Date - Month). I did not change this field since by default on my watch it displayed M - D first. The setting cycle will be finished off when you have set the various fields by again pushing the Lap/Reset Button. Not related to setting the watch, but possibly useful, the Watch will completely reset if all the buttons are pushed at the same time, including pushing the Display Light (or in the case of this watch, the illumination used for the Display Characters). Hope this helps, it worked for me.
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