將 archive2020 按季分 Folder

archive2020 -> archive2020A, archive2020B

touch --date="2020-07-01 00:00" ref

mkdir .archive2020A/cur .archive2020B/cur -p

# 測試

find .archive2020/cur -type f ! -newer $ref -exec ls -l '{}' .archive2020A/cur \;

find .archive2020/cur -type f -newer $ref -exec ls -i '{}' .archive2020B/cur \;