It doesn't look like that exact format is supported by the Snippets extension, but you can get something like this pretty easily:
timestamp: 9/17/2013 10:09:18 AM
To add this template:
- Help > Show Extensions Folder
- Navigate to user/jrowny.brackets.snippets/data
- Open javascript.json
Add this item:
{ "name": "Timestamp", "trigger": "t", "usage": "t", "description": "Insert timestamp into file", "template": "timestamp: $${DATETIME}" }
Restart Brackets
- Now you can insert the snippet in any file by typing "t" followed by Ctrl+Alt+V
If you need a very specific date format, you should be able to patch the source code by editing SnippetPresets.js where your extension is installed. (Don't forget to send your improvements back to the original author as a pull request!)