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.
If you prefer a walkthrough, these Citizen Watch Setting Videos cover the most popular movements including basic analog, chronographs, and World Time models. citizen eco drive gn4ws12g manual link
: Pull the crown out one "click" and rotate it. Note: Avoid changing the date between 9:00 PM and 4:00 AM, as this can damage the calendar gears. Since these watches are powered by light, they
: Look at the case back for a string of characters (usually 4 digits, a hyphen, and 6 or 7 more characters, like E111-S022240 ). : Pull the crown out one "click" and rotate it
: Pull the crown out two "clicks" to the furthest position. Rotate to move the hands.
is much weaker than sunlight; it may take significantly longer (up to several days) to achieve a full charge under office lights compared to just a few hours outdoors.