Inserting current date and time

[InterestedNewbie]

This appends current contents of Notepad to a file (on a new line), but how do I insert date and time (preferably including the seconds) as well?
 

Code:

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int w=win("Notepad" "Notepad")
act id(15 w) 
key Ca       
_s.getsel(); _s.setclip()
_s.getclip(); _s.setfile("$Documents$\Backup.txt" -1 -1 1)
key D