relation create time

I am trying to find out when a table was created in postgresql. Thought it would be easy (coming from Oracle world), but haven't had any luck, especially since we are on RDS and can't peek at the timestamp on the file system. Is this information stored anywhere in the catalog? Or I need to store it myself? Is there any plan to add such meta data information to the catalog as a feature? Thanks a lot!

Thanks,
Patricia

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