public static Date addYears(Date date, int amount)
{
return add(date, 1, amount);
}
public static Date addMonths(Date date, int amount)
{
return add(date, 2, amount);
}
public static Date addWeeks(Date date, int amount)
{
return add(date, 3, amount);
}
public static Date addDays(Date date, int amount)
{
return add(date, 5, amount);
}
public static Date addHours(Date date, int amount)
{
return add(date, 11, amount);
}
public static Date addMinutes(Date date, int amount)
{
return add(date, 12, amount);
}
public static Date addSeconds(Date date, int amount)
{
return add(date, 13, amount);
}
public static Date addMilliseconds(Date date, int amount)
{
return add(date, 14, amount);
}
private static Date add(Date date, int calendarField, int amount)
{
if(date == null)
{
throw new IllegalArgumentException("The date must not be null");
} else
{
Calendar c = Calendar.getInstance();
c.setTime(date);
c.add(calendarField, amount);
return c.getTime();
}
}
