--Jedit Xでファイルを開いて文末に日時を挿入
--ファイルパスの例"/Users/ユーザー名/Desktop/ファイル名.txt"
set filePath to "ファイルパス" as POSIX file

tell application "Jedit X"

activate
open file filePath
tell front document

-- カーソルをドキュメントの末尾に移動
set docLen to textlen + 1
set selected character range to {loc:docLen, len:0}

--末尾に改行×4と日時を挿入
set selected text to return & return & return & return & "---" & (current date) & "---"

--日時を挿入した行の2行上にカーソルを移動
set theRange to selected character range
set loc of theRange to (loc of theRange) + 2
set len of theRange to 0
set selected character range to theRange

end tell
end tell