Unix Epoch: 1565906440
So...
Being the curious tinkerer that I am, I decided to download the Steem source code and the Steem blockchain ...
curl -C - -o steem_block_log https://gtg.steem.house/get/blockchain/block_log &
... and have a look under the hood of Steem.
I guess the Steem blockchain has grown a little from 27GB, now about 213GB. So, it looks like it will be a little while before I can tinker.