ERROR HTMLLayout contains invalid attributes "datePattern", "timezone"

I'm trying to setup HTML Logging, and want to change the date Pattern. I 
found the following page:

https://logging.apache.org/log4j/2.x/manual/layouts.html#HTMLLayout

Which indicates that HtmlLayout has those to parameters:


However, when I run my program, I get an error:

ERROR HTMLLayout contains invalid attributes "datePattern", "timezone"

Here's a snippet from my log4j.xml where I set this up:

<Appenders>
         <RollingFile name="logfile" fileName="sicli-log.html"
             append="true" filePattern="sicli-log-%i.html.gz">
             <SizeBasedTriggeringPolicy size="10MB" />
             <DefaultRolloverStrategy fileIndex='min'
                 max="5" />
             <HtmlLayout title="sicli log" datePattern="DEFAULT" 
timezone="America/New_York" />
         </RollingFile>
     </Appenders>

And here's the pom.xml version for log4j2:

         <dependency>
<groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-api</artifactId>
             <version>2.6.1</version>
         </dependency>
         <dependency>
<groupId>org.apache.logging.log4j</groupId>
             <artifactId>log4j-core</artifactId>
             <version>2.6.1</version>
         </dependency>

The documentation clearly shows that those should be valid parameters, 
so why am I getting that error?

Thank you for your help in this matter.