How to get my guest to keep the correct time and date?

I'm running windows 10 inside gnome boxes (on fedora) which, while kinda slow, works well enough. However, after closing and reopening boxes, it appears that windows just continues where I left off. Now, of course that's what it should do, but it also keeps the time and date from where I left it and when I'm not connected to the internet, it can't grab the correct time from network. Now, I can either set the correct time by hand, or always "correctly" shutdown and boot windows to fix it, but I was wondering if there's a way to provide a time server for windows/boxes guests inside the virtual network that boxes is running. *Reason I'm asking: I need windows for some software to read data from meteorological stations, so I'm in the sticks, not connected to the internet and this software apparently depends on correct system time to be able to download data. If my windows thinks it's one week ago, I can only download data from one week ago.*