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lang-tex
\cs_generate_variant:Nnshould definitely go outside the code for the picture\pgfcalendarcurrentweekdoesn't expand to a number (it can't be used in an expansion context at all, it makes assignments), follow the model of\pgfcalendarcurrentyear-01-01}{\l_tmpb_int}and leave the result in a macro that you can use to expand to the week number