[Coinbase announces final stage of adding ETC](https://blog.coinbase.com/final-testing-for-etc-support-on-coinbase-cdccaedb2ae3).
It took less than 2 months from their initial announcement about adding ETC on June 12th to state they are in their final stages and add the new coin.
Assuming Coinbase's post on July 13th about specifically looking into BAT and ZRX was their initial announcement then that puts us at Sept 13th.
BAT is an ERC token though so I don't know if they have to do extra work compared to ETC.
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