Details on the second debate, from here:

• Each debate will be broadcast live on C-SPAN, ABC, CBS, FOX and NBC, as well as all cable news channels including CNN, Fox News and MSNBC among others.
• The debates will air from 9pm to 10:30pm ET (8pm – 9:30pm CT, 7pm – 8:30pm MT, 6pm – 7:30pm PT)

Sunday, October 9, 2016
Second presidential debate
Moderator: Martha Raddatz, Chief Global Affairs Correspondent and Co-Anchor of “This Week,” ABC
Moderator: Anderson Cooper, Anchor, CNN
Location: Washington University in St. Louis, St. Louis, MO

The second presidential debate will take the form of a town meeting, in which half of the questions will be posed directly by citizen participants and the other half will be posed by the moderator based on topics of broad public interest as reflected in social media and other sources. The candidates will have two minutes to respond and there will be an additional minute for the moderator to facilitate further discussion. The town meeting participants will be uncommitted voters selected by the Gallup Organization.