Turns out to be a case of "user error" for one of my friends. She was adament she has the correct date and time set. Which she did. But she had the Time Zone set incorrectly as for another country where she was at!! Every time she corrected the Date and Time, the automatic weekly Internet Time check and adjustment changed it to the Time Zone she still had on her computer!
Chances are that the other friend has done exactly the same thing so I’ll tick this as resolved.