C / C++ / MFC

char dstStr[20];
const char* pSrc = orgStr;
dstStr[0] = pSrc[0];
dstStr[1] = pSrc[1];
dstStr[2] = pSrc[2];
dstStr[3] = pSrc[3];
dstStr[4] = '-';
dstStr[5] = pSrc[4];
dstStr[6] = pSrc[5];
dstStr[7] = '-';
dstStr[8] = pSrc[6];
dstStr[9] = pSrc[7];
dstStr[10] = ' ';
dstStr[11] = pSrc[8];
dstStr[12] = pSrc[9];
dstStr[13] = ':';
dstStr[14] = pSrc[10];
dstStr[15] = pSrc[11];
dstStr[16] = ':';
dstStr[17] = pSrc[12];
dstStr[18] = pSrc[13];
dstStr[19] = 0;

char* pBuffer = orgStr.GetBuffer(20);

pBuffer[18] = pBuffer[13];
pBuffer[17] = pBuffer[12];
pBuffer[15] = pBuffer[11];
pBuffer[14] = pBuffer[10];
pBuffer[12] = pBuffer[9];
pBuffer[11] = pBuffer[8];
pBuffer[9]  = pBuffer[7];
pBuffer[8]  = pBuffer[6];
pBuffer[6]  = pBuffer[5];
pBuffer[5]  = pBuffer[4];

pBuffer[4] = '-';
pBuffer[7] = '-';
pBuffer[10] = ' ';
pBuffer[13] = ':';
pBuffer[16] = ':';

orgStr.ReleaseBuffer(19);

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

int i = atoi(W2A(str));

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)