Date Conversion from GMT to PST

Elastic Stack Logstash
1

HI,
I'm trying to convert the GMT date filed into PST field but it failed to convert the field can anyone help me to resolve it

timestamp=> "2016-03-18 23:59:51"
date {
match => ["timestamp", "YYYY-MM-dd HH:mm:ss" ]
timezone => "PST8PDT"
}

2

The date filter always converts to UTC. The timezone option indicates how the source timestamp (in your case the contents of the timestamp field) is to be interpreted.