Currently we get date time from Postgres, but this is deprecated.

Need to get the date from a corresponding struct, if it's an activity like Blog/Post/Comment Created/Updated.

Or calculate an approximate date based on current_time - block_time * (current_block - activity_block)

Related to issue:

dappforce/dappforce-subsocial-offchain#61

This link should point to: https://github.com/dappforce/dappforce-subsocial-apps

It doesn't make sense to save the date when an activity was inserted into Postgres DB, because DB can be recreated based on Substrate events any time.

This will be adding another vocabulary from Library of Congress that is specific to names

http://id.loc.gov/authorities/names.html