I think upstream projects would at least
need 2 week to consume the change.
Nick Boldt <nboldt@xxxxxxxxxx> To:
06.06.2017 17:49 Subject:
JDK 9 release moves to Sept / time to
ratify Oxygen.1 schedule! Sent by:
As you may have seen , the July 27 date for JDK 9 GA
and Oxygen.1 / JDK 9 Update release has most likely changed to September
21, a slip of 8 weeks.
If there are no objections by EOD today to the proposed
new JDK 9 dates  and the new JDK 9 GA date becomes Sept 21, can we therefore
ratify the currently proposed dates for the Oxygen.1 September release
(GA Wed Sept 27)?
Or do we want to shift that release back by one week so
we can synchronize with the JDK 9 release date of Thurs Sept 21?
Note that the wiki schedule and planning council's Google Calendar 
don't have actual dates yet, other than Sept 2017, but these dates Fred
proposed back in February  look reasonable.