If SSI is supported by .html (with x-bit set) files on your server, you will see a date listed here:
Otherwise, try these other pages:
Test 1: SSI_test.htm
Test 2: SSI_test.html
Note: Before testing the following 2 files, make sure that you have set the Execute (x) permission with an FTP program (CHMOD 777):
Test 3: SSI_tstx.htm with x-bit set (Unix servers only)
Test 4: SSI_tstx.html with x-bit set (Unix servers only)
Finally, try the following page:
Test 5: SSI_test.shtml