RAD2 Demo: Datetime functions (static vs non-static)

gistfile1.txt

/**
 * Let's look at the method signature for newInstance()
 * public static Datetime newInstance(Integer year, Integer month, Integer day, Integer hour, Integer minute, Integer second)
 * 
 * it says right there that it's a static method, so we invoke it by using the Class name
 * 
 */

Datetime appointment = Datetime.newInstance(2022,10,29,11,15,0);
Datetime nextWeekAppt = appointment.addDays(7);

// Is addDays() static or non-static?

System.debug('🧿 appointment tomorrow: ' + appointment.format('EEE, MMM d yyyy HH:mm a'));
System.debug('🍊 next Saturday: ' + nextWeekAppt.format('EEE, MMM d yyyy HH:mm a'));

/**
 *  The parameters for the format() method follow Javascript patterns:  
 *  https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html
 *
 *  The method signature for  format() is
 *  public String format(String dateFormatString)
 *  note there's not 'static' mentioned, so it's a non-static
 *  method on the instance
 */