Java DateTimeFormatterBuilder with Verbose Time Zone

ZonedDateTime                         // Represent a date and time-of-day in a specific time zone.
.now(                                 // Capture the current moment as seen in the wall-clock time used by the people of a particular region (a time zone). 
    ZoneId.of( "Pacific/Auckland" )   // Specify time zone using proper name in `Continent/Region` format. Never use 3-4 letter pseudo-zone such as IST or PST or EST.
)                                     // Returns a `ZonedDateTime` object.
.withZoneSameInstant(                 // Adjust from one time zone to another. Same point on the timeline, same moment, but different wall-clock time.
    ZoneId.of( "Africa/Tunis" )       
)                                     // Returns a new fresh `ZonedDateTime` object rather than altering/“mutating” the original, per immutable objects pattern.
.toString()                           // Generate text in standard ISO 8601 format, extended to append name of zone in square brackets.

Instant instant = Instant.now() ;  // Capture the current moment in UTC.

ZoneId zMontreal = ZoneId.of( "America/Montreal" ) ;  
ZonedDateTime zdtMontreal = instant.atZone( zMontreal ) ;  // Same moment, different wall-clock time.

ZoneId zKolkata = ZoneId.of( "Asia/Kolkata" ) ;
ZonedDateTime zdtKolkata = zdtMontreal.withZoneSameInstant​( zKolkata ) ;

Instant instant = Instant.parse( "2018-01-23T01:23:45.123456Z" ) ;

Instant instant = zdtKolkata.toInstant() ;

//DateTime now = new DateTime(); // Default time zone automatically assigned.

// Convert a java.util.Date to Joda-Time.
java.util.Date date = new java.util.Date();
DateTime now = new DateTime( date );  // Default time zone automatically assigned.

DateTimeZone timeZone = DateTimeZone.forID( "Asia/Kolkata" );
DateTime nowIndia = now.toDateTime( timeZone );

// For UTC/GMT, use built-in constant.
DateTime nowUtcGmt = nowIndia.toDateTime( DateTimeZone.UTC );

// Convert from Joda-Time to java.util.Date.
java.util.Date date2 = nowIndia.toDate();

System.out.println( "date: " + date );
System.out.println( "now: " + now );
System.out.println( "nowIndia: " + nowIndia );
System.out.println( "nowUtcGmt: " + nowUtcGmt );
System.out.println( "date2: " + date2 );

date: Sat Jan 25 16:52:28 PST 2014
now: 2014-01-25T16:52:28.003-08:00
nowIndia: 2014-01-26T06:22:28.003+05:30
nowUtcGmt: 2014-01-26T00:52:28.003Z
date2: Sat Jan 25 16:52:28 PST 2014

try
{
SimpleDateFormat f = new SimpleDateFormat("yyyyMMddhhmmss");
f.setTimeZone(TimeZone.getTimeZone("Asia/Calcutta"));
Date time = f.parse("20161015113634");  


DateFormat formatter = new SimpleDateFormat("yyyyMMddHHmmss");  
formatter.setTimeZone(TimeZone.getTimeZone("America/Sao_Paulo"));

System.out.println(formatter.format(time)); 
}
catch (ParseException e){

} 

.appendOffset("+HHMM", "????")

public static void main(String[] args) {
    Set<String> timeZones = Set.of(TimeZone.getAvailableIDs());
    Set<String> zoneIds = ZoneId.getAvailableZoneIds();
    System.out.println("Extra TimeZone's: " + diff(timeZones, zoneIds));
    System.out.println("Extra ZoneId's: " + diff(zoneIds, timeZones));
}
static Set<String> diff(Set<String> a, Set<String> b) {
    Set<String> diff = new TreeSet<>(a);
    diff.removeAll(b);
    return diff;
}

Extra TimeZone's: [ACT, AET, AGT, ART, AST, BET, BST, CAT, CNT, CST, CTT, EAT, ECT, EST, HST, IET, IST, JST, MIT, MST, NET, NST, PLT, PNT, PRT, PST, SST, VST]
Extra ZoneId's: []