Displaying the current time or the last modified date of a document.
Most servers only parse SSI on files ending in .shtml . If you put SSI code in a .html file, it will likely be ignored. view shtml link
For simple dynamic tasks, SHTML is often more secure than installing a full-blown CMS. Since there is no database to hack and no complex backend logic, the attack surface is significantly smaller. 🔍 How to View SHTML Files Displaying the current time or the last modified
Inserting a universal header or footer across thousands of pages. view shtml link