need a script or bot that can convert html format calendar into a ical format

hi company we have an intranet page that can be accessed out side of the company network, we can to see our roster that is in the format of "HTML" ( from my understanding from what i see in google chrome developer tool) but i believe the information is being pulled from an internal site that is unaccessible out side the network. i want to be able to open chrome or firefox( which ever) and with a click of a button download this information and convert it into a i believe .csv file. i will provide the site source and what's available from developer tool, Confidentiality is very important and will need an NDA signed.