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Summary
flow "Is Time Zone Id” doest allow to use "Ciudad_de_Mexico"
Question
Customer is using the flow “/Base [1.10.0]/Library/Utility Operations/Date and Time/Is Time Zone Id”, and he could not use the time zone "Ciudad_de_Mexico"
Answer
Replace the operation of the last versionof of the base Content Pack, and use "America/Mexico_City" like Java Time Zone id mentioned in the following link https://garygregory.wordpress.com/2013/06/18/what-are-the-java-timezone-ids/