In the ISO-8601 there are multiple hour formats, one of them is "kk" for hours 1-24.
What is the purpose of this? Are there countries that offset their time? Is it for military usages?
Edit: The direct part from the SimpleDateFormat that I'm referring to is this:
H Hour in day (0-23) Number 0
k Hour in day (1-24) Number 24
HH:mm:ss // 00:00:00 kk:mm:ss // 01:00:00