Time parsing in logstash

[525125]

I need tp parse below log line and extract the time into @apptimestamp . It throughing date parse failure. We need use the filed in kibana. We need to get whole timestamp with timezone and AM/PM

log line:
/start/scripts/transfer.sh Sun 15 Jul 2018 11:15:01 PM EDT files

Logstash config :

input { beats { port => 5045 } }
filter {
    if "tag7" in [kind]  {

    grok { match => { "message" => "%{GREEDYDATA:script} %{DAY:weekday} %{MONTHDAY:day} %{MONTH:month} %{YEAR:year} %{TIME:time} %{WORD:period} %{WORD:zone} %{GREEDYDATA:logmessgae}" } }

  mutate  {
         add_field => {
         "appTimestamp" => "%{weekday} %{day} %{month} %{year} %{time} %{period} %{zone}"
                                }


} 
   date {
        match => [ "appTimestamp","EEE dd MMM yyyy hh:mm:ss a Z" ]
        target => "@appTimestamp"
        remove_field => ["appTimestamp"]
        remove_field => [ "month", "day", "year", "time","period" ]
       }
   }
 
} 
output {
  stdout {
     codec => rubydebug
   }
}