以下を修正してみました。
def get_exports()
exports = Array.new()
@project.each do |report|
report.each do |message|
export = ""
export += report.id.to_s
export += ","
export += report.create_time
export += ","
#export += report.modify_time
export += message.create_time #メッセージの作成日付がBetter
export += ","
export += message.id.to_s
export += ","
MESSAGE_ELEMENT_TYPES.each do |etype|
if message.has_element?(etype) then
element = message.element(etype)
#export += element.value
export += Kconv::tosjis(element.value) #ExportするファイルをSJISにConvertする
end
export += ","
end
exports << export
end
end