: Look at the back of your watch for a string of alphanumeric characters. The movement caliber is the first four characters of this string (e.g., E870, H800). Use the Official Search Tool : Enter those four characters into the Citizen Setting Instructions Download the PDF
If you are unable to locate the manual by the caliber number, you can search directly by the model number on the main Citizen website. citizen eco drive gn4ws12g manual link
counterclockwise (or clockwise, depending on the movement caliber) to change the date. : Look at the back of your watch
The watch uses a specialized, toxic-free rechargeable cell that does not require regular battery changes like traditional quartz watches. Summary of Official Resources citizen eco drive gn4ws12g manual link