class DateTime

def as_json(options = nil)

# => "2005/02/01 15:15:10 +0000"
DateTime.civil(2005,2,1,15,15,10).to_json
# With ActiveSupport::JSON::Encoding.use_standard_json_time_format = false

# => "2005-02-01T15:15:10+00:00"
DateTime.civil(2005,2,1,15,15,10).to_json
# With ActiveSupport::JSON::Encoding.use_standard_json_time_format = true

==== Examples

ISO 8601 format is used if ActiveSupport::JSON::Encoding.use_standard_json_time_format is set.

Coerces the datetime to a string for JSON encoding. 
def as_json(options = nil)
  if ActiveSupport::JSON::Encoding.use_standard_json_time_format
    xmlschema
  else
    strftime('%Y/%m/%d %H:%M:%S %z')
  end
end