Changing time zone format

[Dan]

Getting below error

[2017-01-20T14:56:02,576][ERROR][logstash.filters.ruby ] Ruby exception occurred: undefined method `localtime' for 2017-01-07T03:30:07.000Z:LogStash::Timestamp

doc and my system time zone both are same.

Ruby exception occurred: undefined method `localtime'

hi all, I am using logstash 2.1.3 ,I want to show the @timestamp field in my timezone, like "@timestamp" => "2015-03-09T04:24:29.718+08:00", I try to using ruby conversion in filter. filter { ruby { code => "event['@timestamp'] = event['@timestamp'].localtime('+08:00')" } } but i got the error msg as below, Ruby exception occurred: undefined method `localtime' for "2016-04-29T00:40:51.926Z":LogStash::Timestamp {:level=>:error} Any help is welcome to resolve this.