How to set the time on my watch?
How do I set my watch to the right time when I haven’t used it in months and it’s not on my plan
Apple Watch Series 1, watchOS 5
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You cannot just set the time on the Watch, it is set via the iPhone pairing. If you are experiencing a problem with pairing the iPhone and Watch, you need to figure that problem out. See this. If your Apple Watch isn't connected or paired with your iPhone - Apple Support