No problem I'm really happy I could help ;-)
The date of HF20 is not known yet but the Release Candidate version should be ready this year.
There is one more important thing to remember, HF20 won't take place until 17 of the top witnesses run the new version. STEEMIT_HARDFORK_REQUIRED_WITNESSES parameter is hardcoded in steemd and prevents changes that are not accepted by the "majority". ;-)
Thank you for your response, but as usual some new knowledge creates new questions.
So this is done automatically? When the number of witnesses who upgraded to HF20 will reach 17, there will be loud ping and now suddenly steem blockchain is running HF20? :-)
I mean who is confirming blocks with HF19 code when almost 17 witnesses are already running newer version of code? Are there two versions of code running simultaneously on each node or the HF is somehow compatible to the previous HF (I do not think it is latter)?
Hello ;-)
I'm sorry for pasting the URL instead of answering here, but I won't explain it better than this comment from Core Dev Team. ;-)