I created a server, running on Node.JS to retrieve a time in Israel timezone, and to check, if contact center is closed or not, and, if it is closed - hide "Click to call button".
Server returns whether contact center is closed or not on https://perelview.herokuapp.com/isclosed
Sunday-Thursday 8:00-17:00 Friday 8:00-12:00
Node.JS Express moment.js Server is deployed on heroku
Sources - https://github.com/GrinOleksandr/perelViewServer