/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.time.*;
import java.time.format.*;
import java.time.temporal.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
    String input = "1487615921387-0300";
 
    String inputCount = input.substring ( 0 , 13 ); // zero-based index counting.
    long count = Long.parseLong ( inputCount );
    Instant instant = Instant.ofEpochMilli ( count );
 
    String inputOffset = input.substring ( 13 );
    ZoneOffset offset = ZoneOffset.of ( inputOffset );
 
    OffsetDateTime odt = instant.atOffset ( offset );
 
        System.out.println ( "input: " + input );
        System.out.println ( "inputMillis: " + inputCount );
        System.out.println ( "inputOffset: " + inputOffset );
        System.out.println ( "count: " + count );
        System.out.println ( "instant.toString(): " + instant );
        System.out.println ( "odt.toString(): " + odt );
 
	}
}

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