import java.time.*;
 
class Example
{
    private static long SIXTY_SECONDS_IN_MS = 60000L;
 
    public static void main (String[] args) throws java.lang.Exception
    {
        long l = System.currentTimeMillis();
        l = l - (l % SIXTY_SECONDS_IN_MS);
        System.out.println("l = " + l);
 
        // Checking the result
        LocalDateTime dt = Instant.ofEpochMilli(l).atZone(ZoneId.systemDefault()).toLocalDateTime();
        System.out.println(dt);
        System.out.println(dt.getSecond()); // 0
        System.out.println(dt.getNano());   // 0
    }
}

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