これを修正する方法の手がかり:
SimpleDateFormat df = new SimpleDateFormat("yyyy/mm/dd hh:24mi:ss");
例外:
Exception in thread "main" java.lang.IllegalArgumentException: Illegal pattern character 'i'
at java.text.SimpleDateFormat.compile(SimpleDateFormat.java:696)
at java.text.SimpleDateFormat.initialize(SimpleDateFormat.java:515)
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:464)
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:445)
at CopyEJ.CopyEJ.main(CopyEJ.java:105)