How to convert milliseconds to date in java?

Use below snippet code convert milliseconds to a date format :

public Date convertMilliSecondsToDate(String milliSeconds,String dateFormat) {
long dateTimeInMilliSeconds = Long.parseLong(milliSeconds);
Calendar calendar=Calendar.getInstance();
calendar.setTimeInMillis(dateTimeInMilliSeconds);
DateFormat formatter = new SimpleDateFormat(dateFormat);
Date convertedDate=convertStrToDate(formatter.format(calendar.getTimeInMillis()),dateFormat);
return convertedDate;

}