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From the top Toolbar: Tools > New Plugin
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Paste in the contents of "timestamp.py"
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Save as timestamp.py in
~/Library/Application Support/Sublime Text 3/Packages/User/
(should be the default directory that pops up when you save) -
Choose: Sublime Text 3 > Preferences > Key Bindings - User
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Add:...
{ "keys": ["super+ctrl+t"], "command": "timestamp" }
to make command+ctrl+t perform the insertion.
NOTE: Make sure to add a comma after the previous keymap entry, if present.