Evangelos Foutras authored Aug 02, 2021 and Volker Krause committed Aug 02, 2021

parseDateString() now takes "const GooString *" as the date argument in
order to support unicode date strings. Adjust parsePdfDateTime() to use
the same string type (instead of "const char *") when compiling against
poppler 21.8.0.

https://gitlab.freedesktop.org/poppler/poppler/-/merge_requests/880