/usr/lib/pd/extra/hcs/ISOdate-help.pd is in pd-hcs 0.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #N canvas 212 52 426 266 10;
#X msg 139 82 bang;
#X symbolatom 138 156 0 0 0 0 - - -;
#X text 49 29 output the current date in ISO format;
#X obj 139 114 ISOdate;
#X connect 0 0 3 0;
#X connect 3 0 1 0;
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