From the (super short) Appscope listing:
Never worry about time zones again when talking abroad with international contacts thanks to the help of Timely.
The URL to tap on or type in is mytimely.app/app.html.
Of course, you can turn this into an 'app' yourself with PAWA or just pin it 'as is' on your Start screen. Or just add it as a 'Favourite'. It's up to you. If you're confused by the different PWA options then check out my feature here.
Here's the PWA in action:
An overview of my contacts and their local time - Diane will be in bed, and David at lunch, so probably not a good time to call either of them; diving down to call or message them; and editing details as part of the set-up process.