"Undefined method `gsub!'" when executes a Ruby filter to change timezone

[marcogarfias]

Hi Badger,

I tried to use "timezone" in Date filter, my issue is that the input date is already in GMT and I need this value with my localtime to extract the "hour of day" and "day of week".

I mean the opposite function, I read other topics where it says the only way is using Ruby code to do that.

Convert utc format to local time

thank you. I have tried as your said. Athough no exception happens, the 'snapTime' filed still retainutc format rather than my local time zone. The filter as follows: filter{ ruby{ init => 'require "time"' code => "event.set('snapTime',Time.parse(event.get('snapTime')).localtime('+08:00'))" } } The rubydebug stdout as follows: { "snapTime" => 2019-01-10T02:39:12.000Z, "@version" => "1", "@timestamp" => 2019-01-15T07:22:59.390Z, "name" => "wangqh" } the field 'snapTime' st…

Convert timestamp timezone in Logstash for output index name

Thanks for any advise

PD. I fixed the functions 'stfrtime' and I have the same error