Logstash cannot assign correct date to log timestamp

Elastic Stack Logstash
3

@magnusbaeck Thanks.

Is this correct config:

filter {
    grok {
      match => {"message" => "(?<logTime>[0-9]{2}:[0-9]{2}:[0-9]{2},[0-9]{3}) "}
    }
    ruby {
      code => "event['logTimestamp'] = Time.now.strftime('%Y-%m-%d') + ' ' + event['logTime']"
    }
    date {
      match => ["logTimestamp", "YYYY-MM-dd HH:mm:ss,SSS"]
      timezone => "..."
    }
}

I replaced mutate filter with ruby one to get the current date of the log.