The following is a snippet for LaTeX mode in Emacs. The snippet uses the wonderful YASnippet package and inserts the date of the poem being written and a tiny bit of LaTeX around it.
;; LaTeX snippets
(yas/define-snippets
'latex-mode ; Snippet is available when in LaTeX mode
'(
("poem" ; Keyword that will trigger the snippet
; The snippet itself
; (Each newline can be replaced with \n to make the snippet fit on one line)
"\\begin{verse}
\\poemtitle{${1:untitled}}
% Written on ${2:$(format-time-string \"%e %B %Y\")}
$0
\\end{verse}
"
"begin verse ..." ; Name of the snippet
nil)
)
)
