# "Undefined method \`gsub!'" when executes a Ruby filter to change timezone **URL:** \ **Category:** Logstash\ **Created:** [May 9, 2019, 5:41pm UTC](https://discuss.elastic.co/t/undefined-method-gsub-when-executes-a-ruby-filter-to-change-timezone/180420 "2019-05-09T17:41:12Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![marcogarfias](https://avatars.discourse-cdn.com/v4/letter/m/3ec8ea/32.png) [@marcogarfias](https://discuss.elastic.co/u/marcogarfias)\ **Post date:** [May 9, 2019, 5:41pm UTC](https://discuss.elastic.co/t/undefined-method-gsub-when-executes-a-ruby-filter-to-change-timezone/180420/1 "2019-05-09T17:41:12Z")
Hi, I have an issue when I tried to parse a date string to a date fiel with a different timezone, below the info --- Filter configuration ``` input { stdin { } } filter { date { match => ["message", "yyyy-MM-dd HH:mm:ss"] target => "justtime" } ruby { init => 'require "time"' code => ' event.set("newtime", Time.parse(event.get("justtime")).localtime("-05:00")).sfrtime("%Y-%m-%d %H:%M:%S") ' } } # filter output { stdout { codec => rubydebug } } ``` ---- Execution command ``` $ echo '2019-04-17 15:00:01' | /usr/share/logstash/bin/logstash -r -f "/usr/share/logstash/ruby-logstash.conf" ``` ----- output [ERROR] 2019-05-09 10:40:40.036 [[main]\>worker1] ruby - Ruby exception occurred: undefined method `gsub!' for 2019-04-17T22:00:01.000Z:LogStash::Timestamp { "@version" =\> "1", "@timestamp" =\> 2019-05-09T17:40:39.252Z, "host" =\> "localhost.localdomain", "message" =\> "2019-04-17 15:00:01", "justtime" =\> 2019-04-17T22:00:01.000Z, "tags" =\> [ [0] "\_rubyexception" ] } ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [May 9, 2019, 6:21pm UTC](https://discuss.elastic.co/t/undefined-method-gsub-when-executes-a-ruby-filter-to-change-timezone/180420/2 "2019-05-09T18:21:24Z")
Wouldn't it be easier to use the [timezone](https://www.elastic.co/guide/en/logstash/current/plugins-filters-date.html#plugins-filters-date-timezone) option on the date filter? Also, you are calling sftime (do you mean strftime) on whatever event.set returns, so that is a no-op. ---
**Author:** ![marcogarfias](https://avatars.discourse-cdn.com/v4/letter/m/3ec8ea/32.png) [@marcogarfias](https://discuss.elastic.co/u/marcogarfias)\ **Post date:** [May 9, 2019, 8:18pm UTC](https://discuss.elastic.co/t/undefined-method-gsub-when-executes-a-ruby-filter-to-change-timezone/180420/3 "2019-05-09T20:18:00Z")
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](https://discuss.elastic.co/t/convert-utc-format-to-local-time/164237/3): > > 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… > Thanks for any advise PD. I fixed the functions 'stfrtime' and I have the same error ---
**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\ **Post date:** [May 9, 2019, 9:14pm UTC](https://discuss.elastic.co/t/undefined-method-gsub-when-executes-a-ruby-filter-to-change-timezone/180420/4 "2019-05-09T21:14:13Z")
I am unable to reproduce the issue, but this ``` input { generator { count => 1 lines => ['2018-11-02 14:31:01'] } } filter { date { match => ["message", "yyyy-MM-dd HH:mm:ss"] target => "justtime" } ruby { init => 'require "time"' code => ' t = event.get("justtime").to_s event.set("newtime", Time.parse(t).localtime("-07:00").strftime("%Y-%m-%d %H:%M:%S")) ' } } ``` produces ``` "newtime" => "2018-11-02 11:31:01", "justtime" => 2018-11-02T18:31:01.000Z ``` ---
**Author:** ![marcogarfias](https://avatars.discourse-cdn.com/v4/letter/m/3ec8ea/32.png) [@marcogarfias](https://discuss.elastic.co/u/marcogarfias)\ **Post date:** [May 14, 2019, 9:04pm UTC](https://discuss.elastic.co/t/undefined-method-gsub-when-executes-a-ruby-filter-to-change-timezone/180420/5 "2019-05-14T21:04:54Z")
Thanks Badger, It works, but I need to clarify to other people that checks this post using an example with ("-12:00") as parameter in Ruby code (I'm in Mexico and this post was wrote in May 14, 2019 at 16:00:01 localtime ) ``` "message" => "2019-05-14 21:00:01", --- Datetime GMT/UTC in my log file "@timestamp" => 2019-05-14T21:00:45.406Z, --- Datetime right now in UTC/GMT "justtime" => 2019-05-15T04:00:01.000Z, --- "message" moved 7 hours to the future, Logstash is trying to put in GMT/UTC according their rules "newtime" => "2019-05-14 16:00:01", --- "Justtime" less 12 hours to be in my localtime "host" => "localhost.localdomain", "@version" => "1", "sequence" => 0 ``` ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [June 11, 2019, 9:04pm UTC](https://discuss.elastic.co/t/undefined-method-gsub-when-executes-a-ruby-filter-to-change-timezone/180420/6 "2019-06-11T21:04:54Z")
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