Question

I am wondering how I would loop through a date/time or any type of variable to go from 00:00 to 24:00 every 30 Mins?

So I need a variable that shows times in 24HR format (01:00, 09:00) and every time I loop through it, to add 30 mins to the time? I then need to use this value in a string.

The time needs to start at 00:00AM and will end with 24:00.

Any ideas how should I go with it?

output should be like this - 00:00 00:30 01:00 ....24:00

Answer 1

Possibly a little over kill, but it does all the auto rolling and allows the use of DateFormat

DateFormat df = new SimpleDateFormat("HH:mm");
Calendar cal = Calendar.getInstance();
cal.set(Calendar.HOUR_OF_DAY, 0);
cal.set(Calendar.MINUTE, 0);
cal.set(Calendar.SECOND, 0);
int startDate = cal.get(Calendar.DATE);
while (cal.get(Calendar.DATE) == startDate) {
    System.out.println(df.format(cal.getTime()));
    cal.add(Calendar.MINUTE, 30);
}

You can’t have 24:00 as it’s 00:00…