Java Utililty Methods Calendar from Date

Calendar cal = Calendar.getInstance();
cal.setTime(date);
return cal;

Calendar result = Calendar.getInstance();
result.setTime(date);
return result;

Calendar cal = GregorianCalendar.getInstance();
cal.setFirstDayOfWeek(firstDayOfWeek);
cal.setTime(date);
return cal;

Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.DAY_OF_MONTH, step);
return calendar;

Calendar cal = new GregorianCalendar();
cal.setTime(dt);
return cal;

Calendar cal = Calendar.getInstance(to);
cal.setTime(dt);
return cal;

if (inputDate == null)
    return null;
Calendar calendar = Calendar.getInstance();
calendar.setTime(inputDate);
return calendar;