/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.time.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main(String[] args) {
		System.out.println(parseNtp("C50204ECEC42EE92"));
		System.out.println(parseNtp("C50204EBD3E8DDA4"));
	}
 
	public static ZonedDateTime parseNtp(String ts) {
		long seconds = Long.parseLong(ts.substring(0, 8), 16);
		long fraction = Long.parseLong(ts.substring(8), 16);
		return LocalDateTime.parse("1900-01-01T00:00:00").atZone(ZoneId.of("UTC"))
				.plusSeconds(seconds)
				.plusNanos((long)(1000000000.0 / (1L << 32) * fraction));
	}
}

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