Hi, I noticed that all space created with setw in an ostream gets filled zeros after a ros::Time object has been printed in the ostream. A patch is availble in the following ticket: https://code.ros.org/trac/ros/ticket/3693 It just resets the fill caracter to space after the time is printed: --- time.cpp.original 2011-09-28 16:48:45.000000000 +0200 +++ time.cpp 2011-09-28 16:41:41.000000000 +0200 @@ -311,13 +311,13 @@ std::ostream& operator<<(std::ostream& os, const Time &rhs) { - os << rhs.sec << "." << std::setw(9) << std::setfill('0') << rhs.nsec; + os << rhs.sec << "." << std::setw(9) << std::setfill('0') << rhs.nsec<