set aFile to POSIX path of (choose file)
set targDate to current date
changeFileCreationDate(targDate, aFile) of me
changeFileModDate(targDate, aFile) of me

–指定パスのファイルの作成日時を変更する
on changeFileCreationDate(aDate, aFile)
　　set aDic to current application’s NSMutableDictionary’s dictionaryWithObject:aDate forKey:(current application’s NSFileCreationDate)
　　set aFM to current application’s NSFileManager’s defaultManager()’s setAttributes:aDic ofItemAtPath:(POSIX path of aFile) |error|:(missing value)
end changeFileCreationDate

–指定パスのファイルの修正日時を変更する
on changeFileModDate(aDate, aFile)
　　set aDic to current application’s NSMutableDictionary’s dictionaryWithObject:aDate forKey:(current application’s NSFileModificationDate)
　　set aFM to current application’s NSFileManager’s defaultManager()’s setAttributes:aDic ofItemAtPath:(POSIX path of aFile) |error|:(missing value)
end changeFileModDate