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I don't know if your end goal is to be able to chain any shell commands or not...
nnoremap <silent> sp :silent r! date "+\%T"<CR>:silent !echo $PWD/'%' > /dev/null<CR>:redraw!<CR>
Might do what you need.
You can also check :h system() or :h systemlist() functions to do the same:
nnoremap <silent> sp :call append('.'...
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