I want to add something with monoj's reply which is below:
You'll get the tablespace's creation date indirectly. Monoj's query will basically tells the creation date of a datafile when one add it to a tablespace.
Since during creation of a tablespace, one have to specify a datafile( which is the mandatory requirement), so the creation date of the first datafile of a given tablespace is the creation date of that tablespace too.
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