LaTeX code to generate timestamp; the resulting command is \now

gistfile1.txt

%% Code to create a timestamp. The resulting command is \now
%%
%% SCL; 30 May 2012
\newcount\hour \newcount\minute
\hour=\time \divide \hour by 60
\minute=\time
\loop \ifnum \minute > 59 \advance \minute by -60 \repeat
\def\now{\number\year%
-{\ifnum \month < 10 0\fi}\number\month%
-{\ifnum \day < 10 0\fi}\number\day%
~{\ifnum \hour < 10 0\fi}\number\hour%
:{\ifnum \minute < 10 0\fi}\number\minute}