https://community.cloudera.com/t5/Support-Questions/How-to-convert-unix-timestamp-to-datetime-in-Apache-NiFi/m-p/224744#M186608 <P>I noticed, however, that the problem lies elsewhere. For example, I wanted to check if I change the value of the user attribute using the toUpper () function. Unfortunately, but at the exit the user's name was still written in lowercase.</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="71390-updateattribute.png" style="width: 766px;"><img src="https://community.cloudera.com/t5/image/serverpage/image-id/15477i79FB8C6ACA182032/image-size/medium?v=v2&amp;px=400" role="button" title="71390-updateattribute.png" alt="71390-updateattribute.png" /></span></P><P>Result is: <BR />datetime,duration,client_address,cache_result,status_code,bytes,request_method,url,user,hierarchy_code,server,content_type 1518442283.483,161,127.0.0.1,TCP_MISS,200,103701,GET,<A href="http://www.cnn.com/,matt,DIRECT,199.27.79.73,text/html" target="_blank">http://www.cnn.com/,matt,DIRECT,199.27.79.73,text/html</A></P> Sun, 18 Aug 2019 01:41:03 GMT wojciech_leszcz 2019-08-18T01:41:03Z