Define "access". I generally get it this way:

long millis = new Calendar().getTimeInMillis();

Or:

long millis = System.currentTimeMillis();

Same result.

You only need time, yes? Not dates? And expressed in hours, minutes, and
seconds? Then you do not need a Calendar object, and you do not need
milliseconds. The simple way is to split the time string into sections and
multiply them together:

public class Test {
 
  static int timeSecondsFromString(String s)
  {
     int t = 0;
     String[] array = s.split(":");
     if(array.length == 3) {
        t = Integer.parseInt(array[0]) * 1440
            + Integer.parseInt(array[1]) * 60
            + Integer.parseInt(array[2]);
     }
     return t;
  }
 
  public static void main(String[]args)
  {
     if (args != null && args.length > 0) {
        int timeSeconds = timeSecondsFromString(args[0]);
        System.out.println(timeSeconds);
     }
  }
};

Input: 12:34:56

Output: 19376 seconds.

I will leave the time comparisons to you.