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Thread: N00b questions about ROS time

  1. #1
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    N00b questions about ROS time

    When ROS is passing time stamps around, it looks like it is seconds in floating point. So what are the seconds? Is that the standard UNIX interpretation, ie: seconds-since-the-epoch? When ROS nodes running on different systems are trying to synchronize, do they all use their own wall-clocks to time-stamp the generated sensor readings, etc?

    -dave

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    Re: N00b questions about ROS time

    The time is in UNIX standard seconds-since-the-epoch (january 1, 1970). If you have multiple different computers, you want to make their clocks synchronized (NTP via chrony works well on Ubuntu).

    -Fergs

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    Re: N00b questions about ROS time

    Thanks, makes sense. I can see where NTP is going to be required to make the time stamps work well.

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