java milliseconds to date code example

Example 1: get long from date java

String string_date = "12-December-2012";

SimpleDateFormat f = new SimpleDateFormat("dd-MMM-yyyy");
try {
    Date d = f.parse(string_date);
    long milliseconds = d.getTime();
} catch (ParseException e) {
    e.printStackTrace();
}

Example 2: date to milliseconds java

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.*;

public class HelloWorld{

     public static void main(String []args){

		String myDate = "2020-02-26 03:57:35";
		LocalDateTime localDateTime = LocalDateTime.parse(myDate,
		    DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss") );
		    
		    long millis = localDateTime
		    .atZone(ZoneId.of("America/Chicago")) //optional
		    .toInstant().toEpochMilli();
    
		System.out.println(millis);
     }
}