Parse sub-second digits in ROSCONSOLE_FORMAT

edit

In ROS noetic, one can change the way dates and times are represented by doing export ROSCONSOLE_FORMAT='${time:format string}'.

I am using the following: export ROSCONSOLE_FORMAT='[${severity}] [${time:%Y-%m-%d %H:%M:%S.%f}]: ${message}' because displaying only the seconds is not enough for my application.

However, it seems that there are 2 types of logs (maybe roscpp vs rospy?):

Type 1

[ INFO] [1636988628.662548891]: msg

This gets parsed ok, i.e. I get the first 6 decimal points (not 9 though which is weird)

For example, I see [ INFO] [2021-11-14 14:35:45.662548]: msg

Type 2

[INFO] [1636988672.555812]: msg

This does not get parsed ok, i.e. I get the string %f instead of the actual decimal points.

For example, I see [ INFO] [2021-11-14 14:35:45.%f]: msg

That's surprising given that this has 6 decimal points which is what I'm getting in Type 1. Any idea how to parse this correctly?