Rubyの0埋め
format("%02d", 1)
=> "01"
format("%03d", 1)
=> "001"
$
cat "dev63.hatenablog.com/entry/2022/08/03/023600.md"
// ブログエントリー — 2022/8/3
format("%02d", 1)
=> "01"
format("%03d", 1)
=> "001"