How check changes events?

How in dhtmlxScheduler check changes in events? And if is changed, reolad all events?
My calendar will be displayed in multiple browsers.


There is no built in solution.

Most common solution - make ajax calls to server side , time to time, and if “changed” flag is set on server side, reload event in grid through

scheduler.clearAll() scheduler.load(url)

How to generate such a flag? I thought of md5 () to handle the contents of the database. I do not know how to write all events to a variable?