differential_drive_controller publishing with wrong timestamps

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Hello,

I'm using the differential_drive_controller plugin in urdf of my robot:

  <!-- differential drive -->
<gazebo>
    <plugin name="differential_drive_controller" filename="libgazebo_ros_diff_drive.so">
        <alwaysOn>true</alwaysOn>
        <updateRate>100</updateRate>
        <leftJoint>right_wheel_joint</leftJoint>
        <rightJoint>left_wheel_joint</rightJoint>
        <wheelSeparation>1.2</wheelSeparation>
        <wheelDiameter>0.3</wheelDiameter>
        <torque>5</torque>
        <commandTopic>cmd_vel</commandTopic>
        <odometryTopic>stereo/odom</odometryTopic>
        <odometryFrame>stereoodom</odometryFrame>
        <robotBaseFrame>base_link4</robotBaseFrame>
    </plugin>
</gazebo>

Everything works fine, although its data topics are publishing with completely wrong timestamps (they're huge).

    header: 
  seq: 175517
  stamp: 
    secs: 1453724932
    nsecs: 329340743
  frame_id: stereoodom
child_frame_id: base_link4

How I'm using tf's this is being annoying. Can anyone help me on this? Please.