[Boost-users] Converting Timestamp into hex of 8 bytes

Sorry for wrong post. I have a string Timestamp of 1383889129 which on ONLINE conversion from string to hex gives a 10 bytes as "31 33 38 33 38 38 39 31 32 39". But, the need is to have the TIMEStamp in 8 bytes only. OR any other way using either C++ or Boost where I can convert the string Timestamp of 1383889129 into 8 bytes hex value. Any clue ..!!