Since these watches are powered by light, they do not require battery replacements. If your watch has stopped or is losing time, Citizen recommends exposing it to for several hours.
For the exact GN4-W S12G manual and official instructions, download the PDF from Citizen’s support/manuals page. Look up the model number GN4-W S12G on Citizen’s website or their manuals/downloads section to get the official manual and warranty information. citizen eco drive gn4ws12g manual link
Your watch is 12 hours off. Advance the time by 12 hours (pull crown to position 2, rotate hands forward until the date changes at midnight, not midday). Since these watches are powered by light, they
Citizen houses the instructions for the GN-4W-S movement under their "Promaster" or "Nighthawk" technical guides. citizen eco drive gn4ws12g manual link