почему не delete (выделение памяти)

#include <time.h>
#include <stdio.h>
 
int main( void )
{
    struct tm   *newTime;
    time_t      szClock;
 
    // Get time in seconds
    time( &szClock );
 
    // Convert time to struct tm form 
    newTime = localtime( &szClock );
 
    // Print local time as a string.
    printf_s( "Current date and time: %s", asctime( newTime ) ); // C4996
    // Note: asctime is deprecated; consider using asctime_s instead
}

_TSCHAR * __cdecl _tasctime (
    REG1 const struct tm *tb
    )
{
    REG2 _TSCHAR *p = buf;
    errno_t e = 0;
 
    _TSCHAR *retval;            /* holds retval pointer */
    _ptiddata ptd = _getptd_noexit();
 
    /* Use per thread buffer area (malloc space, if necessary) */
    if (ptd) {
#ifdef _UNICODE
        if ( (ptd->_wasctimebuf != NULL) || ((ptd->_wasctimebuf =
            (wchar_t *)_calloc_crt(_ASCBUFSIZE, sizeof(wchar_t))) != NULL) )
            p = ptd->_wasctimebuf;
#else  /* _UNICODE */
        if ( (ptd->_asctimebuf != NULL) || ((ptd->_asctimebuf =
            (char *)_calloc_crt(_ASCBUFSIZE, sizeof(char))) != NULL) )
            p = ptd->_asctimebuf;
#endif  /* _UNICODE */
    }
 
    retval = p;         /* save return value for later */
 
 
    e = _tasctime_s( p, _ASCBUFSIZE, tb );
    if ( e != 0 )
    {
        return NULL;
    }
 
    return (retval);
}

_CRTIMP void
WINAPI _freefls (
    void *data
    )
{
    /*
     * Free up the _tiddata structure & its malloc-ed buffers.
     */
// ....................
        if(ptd->_asctimebuf)
            _free_crt((void *)ptd->_asctimebuf);
// ....................
}