To test if your server supports SSI then, you can run a simple test, by inserting the below code inside a webpage, and saving the page with a .shtml extension (the most common extension configured to parse SSI by default):
test.shtml source:
<!--#echo var="DATE_LOCAL" -->
When you run test.shtml in your browser, you should see the current date plus time of your server displayed:
Friday, 10-May-2019 18:13:15 CDT
