wcs

    A pointer to the resultant wide-character string.

 maxsize

    The maximum number of wide characters to be stored in the
    resultant string.

 format

    A pointer to the string that controls the format of the output
    string. For the XPG4 interface, this argument is a pointer to
    a constant character string. For the ISO C interface, it is a
    pointer to a constant wide-character string.

 timeptr

    A pointer to the local time structure. The tm structure is
    defined in the <time.h> header file.