Time, Java - rextester

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import java.time.OffsetDateTime;
import java.time.LocalDateTime;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.time.ZoneId;
import java.util.Date;
import java.util.TimeZone;
import java.text.SimpleDateFormat;
import java.util.Calendar;

class Rextester{

public static void main(String []args){
        try {
            String date = "2018-10-22T02:17:58.717853Z";
            String pattern = "yyyy-MM-dd'T'HH:mm:ss.SSSSSSXXX";
                        
            DateTimeFormatter istFormat = DateTimeFormatter.ofPattern(pattern).withZone(TimeZone.getTimeZone("Asia/Calcutta").toZoneId());            
            ZonedDateTime istZdt = ZonedDateTime.parse(date, istFormat);                                    
            
            Date istDate = Date.from(istZdt.toInstant());           
            
            System.out.println(" ZDT :: " + istZdt + " - ZoneDate :: " + istDate + " - Time :: " + istDate.getTime());
            
        } catch(Exception e) {
            e.printStackTrace();
        }
     }
}

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Compilation time: 1.31 sec, absolute running time: 0.38 sec, cpu time: 0.45 sec, memory peak: 27 Mb, absolute service time: 1,7 sec