How to Create a Date Time Snippet in Sublime Text 2 (Dynamic Signature with Time Stamp)

You’ll have to create a new plugin. From the menu bar select

Tools > New Plugin

Copy the Python script from the signature.py file. Remember to replace your email address (it’s example.com).
Save the file, signature.py, is fine. Next open up Preferences > Key Bindings – Default and add a new entry.

ctl+alt+s will add the snippet to the first line of your file.