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I ran into similar issue when mocking my response with DateTime. Apparently iso8601 on DateTime does not format UTC with a 'Z'. You can use ActiveSupport::TimeWithZone instead. ``` require 'active_support/core_ext'...

`ActiveSupport.use_standard_json_time_format` is `true` by default. If it is false, you'll need to call iso8601 But you need to convert it to TimeWithZone because iso8601 on DateTime doesn't replace UTC with...