Mastering Time Zones: How to Calculate Differences Accurately
https://gettimedifferenceinsider.brightsora.com/posts/mastering-time-zones-how-to-calculate-differences-accurately
Figuring out time zone math used to trip me up during international calls, but once I learned to convert to Coordinated Universal Time before comparing, everything clicked. Adding or subtracting the offset from UTC for each location makes calculating the hour difference straightforward. I keep a small chart for the zones I deal with most, and it saves me from scheduling meetings at 3 a.m.