set sDL to POSIX path of (choose folder)
–> "/Users/me/Downloads/"–AppleScript HFS to POSIX path (ends with slash)

retLatestYYYYMMDDFolderUnder(sDL, 2017) of me

on retLatestYYYYMMDDFolderUnder(aPOSIXFolderPath as string, minYYYY as integer)
　　load framework –load BridgePlus framework
　　
　　if aPOSIXFolderPath ends with "/" then
　　　　set aPOSIXFolderPath to text 1 thru -2 of aPOSIXFolderPath
　　end if
　　–> "/Users/maro/Downloads"–Cocoa POSIX path (does not end with)
　　
　　set sList to (current application’s NSString’s stringWithString:aPOSIXFolderPath)’s pathComponents() as list
　　–>　　{​​​​​"/", ​​​​​"Users", ​​​​​"me", ​​​​​"Downloads"​​​}
　　
　　set sLen to length of sList
　　–>　　4
　　
　　set fListRes to getFolderspathComponentsIn(aPOSIXFolderPath) of me
　　–> {​​​​​{​​​​​​​"/", ​​​​​​​"Users", ​​​​​​​"me", ​​​​​​​"Downloads", ​​​​​​​"2016"​​​​​}, ​​​​​ ​​​​​{​​​​​​​"/", ​​​​​​​"Users", ​​​​​​​"me", ​​​​​​​"Downloads", ​​​​​​​"2018", ​​​​​​​"03", ​​​​​​​"20"​​​​​}…}
　　
　　set anArray to current application’s NSMutableArray’s arrayWithArray:fListRes
　　
　　set predStr to "SELF[SIZE] = " & (sLen + 3) as string
　　set aPredicate to current application’s NSPredicate’s predicateWithFormat:predStr
　　set t1Array to (anArray’s filteredArrayUsingPredicate:aPredicate)
　　–> {​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​{​​​​​​​"/", ​​​​​​​"Users", ​​​​​​​"me", ​​​​​​​"Downloads", ​​​​​​​"2018", ​​​​​​​"03", ​​​​​​​"20"​​​​​}…}
　　
　　set predStr1 to ("SELF[" & (sLen) as string) & "].floatValue >= " & (minYYYY as string) & " && SELF[" & ((sLen + 1) as string) & "].floatValue >= 1 && SELF[" & ((sLen + 2) as string) & "].floatValue >= 1"
　　set aPredicate1 to current application’s NSPredicate’s predicateWithFormat:predStr1
　　set t2Array to (t1Array’s filteredArrayUsingPredicate:aPredicate1) as list
　　
　　–YYYY, MM, DDでそれぞれ降順ソート。最新のものを取得　　
　　set theResult to current application’s SMSForder’s subarraysIn:t2Array sortedByIndexes:{sLen, sLen + 1, sLen + 2} ascending:{false, false, false} sortTypes:{"compare:", "compare:", "compare:"} |error|:(missing value)
　　if (theResult as list = {} or theResult = missing value) then return {}
　　
　　–最新のYYYY/MM/DDフォルダを取得してFinder上で選択表示
　　set theNewest to contents of first item of (theResult as list)
　　set theNewestStr to (current application’s NSString’s pathWithComponents:theNewest)
　　set parentPath to theNewestStr’s stringByDeletingLastPathComponent()
　　set aRes to current application’s NSWorkspace’s sharedWorkspace()’s selectFile:theNewestStr inFileViewerRootedAtPath:parentPath
end retLatestYYYYMMDDFolderUnder

on getFolderspathComponentsIn(posixPath)
　　script spd
　　　　property allItems : {}
　　end script
　　
　　set allItems of spd to {}
　　set theNSURL to current application’s |NSURL|’s fileURLWithPath:posixPath
　　set theNSFileManager to current application’s NSFileManager’s new()
　　
　　— get URL enumerator
　　set theNSFileEnumerator to theNSFileManager’s enumeratorAtURL:theNSURL includingPropertiesForKeys:{current application’s NSURLIsDirectoryKey, current application’s NSURLIsPackageKey} options:((current application’s NSDirectoryEnumerationSkipsPackageDescendants) + (current application’s NSDirectoryEnumerationSkipsHiddenFiles as integer)) errorHandler:(missing value)
　　
　　— get all items from enumerator
　　set (allItems of spd) to theNSFileEnumerator’s allObjects()
　　set theFolders to {} — to store folders
　　
　　— loop through
　　repeat with i from 1 to count of (allItems of spd)
　　　　— is it a directory?
　　　　set {theResult, isDirectory} to ((item i of (allItems of spd))’s getResourceValue:(reference) forKey:(current application’s NSURLIsDirectoryKey) |error|:(missing value))
　　　　if isDirectory as boolean = true then
　　　　　　set {theResult, isPackage} to ((item i of (allItems of spd))’s getResourceValue:(reference) forKey:(current application’s NSURLIsPackageKey) |error|:(missing value))
　　　　　　
　　　　　　— is it not a package?
　　　　　　if not isPackage as boolean = true then
　　　　　　　　set end of theFolders to (item i of (allItems of spd))’s pathComponents() as list –parse each directory into list
　　　　　　end if
　　　　end if
　　end repeat
　　
　　return theFolders
end getFolderspathComponentsIn