EditPad Lite has a nice feature (CTRL-E, CTRL-I) which inserts a time stamp e.g. \"2008-09-11 10:34:53\" into your code.
I wanted a custom command :Date (not a key mapping) to insert the date at the current cursor position.
Unfortunately straightforward commands like r!date result in a new line. So finally I came up with the following:
command Date execute "normal i=strftime('%F %T')"
which adds the date/time string at the cursor position without adding any new line (change to normal a add after the cursor position).