Function wcsftime 

#[unsafe(no_mangle)]
pub extern "C" fn wcsftime(
    wcs: *mut wchar_t,
    maxsize: size_t,
    format: *const wchar_t,
    timptr: *const tm,
) -> size_t

See https://pubs.opengroup.org/onlinepubs/9799919799/functions/wcsftime.html.