I would assume you need to add your time and location at the time of the screenshot also so that you can correct the remote displayed time to Microsoft Weather time?
Yep! The tool currently only works with screenshots taken within the past hour, since that's the only weather data I have access to right now. It also relies on having a consistent reference point for time. When you run the script, it uses your current timezone to help align the time shown in the screenshot with Microsoft Weather's data.