I use Google for those pretty often.
9:00 GMT-7 in CET
https://www.google.com/search?channel=fs&client=ubuntu&q=9%3...
> 9:00 UTC in Thailand
A regular complaint I have with google is (simplified example) converting EDT to MST. Google will “helpfully” correct me and convert EDT to MDT instead, which is explicitly not what I asked for. It’s stupid (I can usually figure it out on my own) but that would be a huge win for me.