Today I added a test subdomain and I am doubting the serial got updated. It says 2017082309 ; serial which suggests that it is the ninth update on the 23rd of August. Today is the 25th so I expected it to be 201708250x (not sure if this was the first change today).
Aparently at creation the date is used but after that with updates it is only incremented, not changing the date. Not sure, but I though that it was convention to first update the date and then increment. Can that be patched in the next release? Thank you!