When/how-often is ffcal_week_this.xml updated?

Hi I am new to the forum, can some one let me know
how-often/when is the ffcal_week_this.xml updated,

I currently see the date as Sep 13 - Sep 19

Assuming that I always need the upto-date events, do I repeatedly
hit the url
http://cdn.forexfactory.com/ffcal_week_this.xml
at regular intervals

Or is there a better approach to extract the uptodate information in XMl format

Also is the XMl tags likely to change? If so, can I also get the uptodate DTD or XML Schema for the ffcal_week_this.xml from somewhere?

Hello,

Your API calendar not working. Please fix. Thanks.

I currently see the date as Nov 06 - Nov 11

http://www.forexfactory.com/ffcal_week_this.xml

Hello,

Your API calendar have bugs in: <impact/>. They either do not appear or are exchanged from low to high. Please fix. Thanks.

I currently see the date as 08-06-2017 - 08-11-2017

http://www.forexfactory.com/ffcal_week_this.xml

Does anyone know if there is an indicator with actual values or not?