Problems with time using rosbag api

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Hi all!!

I have some problems using the rosbag api. Here I present some of my code:

rosbag::Bag bagR("bag.bag",rosbag::bagmode::Read);
rosbag::View view;
view.addQuery(bagR,rosbag::TopicQuery(_topics));
nav_msgs::Odometry msg;
BOOST_FOREACH(rosbag::MessageInstance const m, view){
  ROS_INFO("T: %i.%i",m.getTime().sec,m.getTime().nsec);
  msg = *m.instantiate<nav_msgs::Odometry>();
  ROS_INFO("T: %i.%i",msg.header.stamp.sec,msg.header.stamp.nsec);
}

beeing _topics a vector of strings containg all the topics I need.

The problem is that the time from m.getTime() and the time from msg.header.stamp are different and I do not understand why that happends. Can somebody give me a hint on that?

Cheers