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/usr/share/psychtoolbox-3/PsychBasic/PsychtoolboxDate.m is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

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function d=PsychtoolboxDate
% PsychtoolboxDate returns the release date, e.g. '1 August 1998'.
% You can supply this string as an argument to DATNUM.

% HISTORY
% 12/3/04   awi    Copied into OS X  PTB. Added history comments.  

global Psychtoolbox
PsychtoolboxVersion; % Load the Psychtoolbox struct.
d=Psychtoolbox.date;