Ugh.
Do not do that.
Putting meta-data (e.g. dates) into variables names is a sign that you are doing something wrong:
Better data design (e.g. using indexing rather than magically accessing variabale names and pointlessly obfuscating lots of code inside strings which then then to be evaluated) would make this bug much easier to identify and fix (in fact the MATLAB IDE would underline it and probably offer to fix it for you).
Instead of forcing meta-data into variable names (which forces you into writing slow, buggy, inefficient code (e.g. yours)) you would be much better off sytoring meta-data as data its own right. Then you are on your way to writing simpler, neater, much more efficient code.
