JAVA

convert date to calendar java

public static Calendar toCalendar(Date date){ 
  Calendar cal = Calendar.getInstance();
  cal.setTime(date);
  return cal;
}

Convert Calendar to Date java

calendar.getTime()

java calendar to date

System.out.println(new GregorianCalendar(2022, 1, 1).getTime())

Convert Date to Calendar java

Date date = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.add(Calendar.YEAR, 1);