For automatic watches, the first time they are used, they must be fully wound first. It's best to wear the watch for more than 10 hours a day to keep the time accurate. If not, please wind it up at a fixed time every day.</br>The watch is equipped with day and date functions. The day of the week and the date are changed every 24 hours (The date at 12 o'clock in the night; the week at 4 o'clock in the morning). If the AM/PM setting is incorrect, please adjust the time for 12 hours.