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/* | |
Sumar y restar fechas con Java y Calendar | |
@author parzibyte | |
*/ | |
import java.text.DateFormat; | |
import java.util.Calendar; | |
import java.util.Locale; | |
class Main { | |
public static void main(String[] args) { | |
Calendar c = Calendar.getInstance(); | |
System.out.println("Fecha original: " + formatearCalendar(c)); | |
// Restar cinco meses | |
c.add(Calendar.MONTH, -5); | |
System.out.println("-5 meses: " + formatearCalendar(c)); | |
// Sumar 2 años | |
c.add(Calendar.YEAR, 2); | |
System.out.println("+2 años: " + formatearCalendar(c)); | |
// Restar 2 días | |
c.add(Calendar.DAY_OF_YEAR, -2); | |
System.out.println("-2 días: " + formatearCalendar(c)); | |
// Sumar 52 días | |
c.add(Calendar.DAY_OF_YEAR, 52); | |
System.out.println("+52 días: " + formatearCalendar(c)); | |
// Sumar 24 horas | |
c.add(Calendar.HOUR_OF_DAY, 24); | |
System.out.println("+24 horas: " + formatearCalendar(c)); | |
// Sumar 1500 minutos (25 horas) | |
c.add(Calendar.MINUTE, 1500); | |
System.out.println("+1500 minutos: " + formatearCalendar(c)); | |
// Restar 90000 segundos (25 horas, 25 * 60 * 60) | |
c.add(Calendar.SECOND, -90000); | |
System.out.println("-90000 segundos: " + formatearCalendar(c)); | |
} | |
// Este es un método para formatear e imprimir la fecha, pero no tiene nada | |
// que ver con sumar o restar | |
public static String formatearCalendar(Calendar c) { | |
DateFormat df = DateFormat.getDateInstance(DateFormat.LONG, Locale.getDefault()); | |
return df.format(c.getTime()); | |
} | |
} |
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