Building a widget of a website for notification center


I work with people across many different time zones and I always have to check time zone conversions to set up schedules for calls.

They are websites that help with converting the time with a very slider and I was wondering if there was a way of making interactive widgets from different websites to put on the notification center.

The app world clock pro no longer has a widget that goes inside of the notification section and I've been trying to find a solution for a while now.

Thank you