Correct the hours on the cameras Mi Home

I have some cameras installed in the app Mi Home. However in only one I can see in the watermark that appears in the image the correct hours of my country, because in the others it is with the hour of Mainland. My question is, how do I put the rest at the correct time? I thought it would not even be possible because in the initial configuration we have to choose Mainland as geographic position, however it is possible because I have a camera with the image with the correct hours. If someone knows how to put thank you.