ExtDateTimeUtils { public static Date daysAfterNow(int numDays) { if (numDays <= 0) { throw new IllegalArgumentException(); } final Calendar cal = new GregorianCalendar(); cal.setTime(new Date()); cal.add(Calendar.DAY_OF_YEAR, numDays); return cal.getTime(); } private  ExtDateTimeUtils(); static String timestampToHumanDateAndTime(long timestamp); static String dateToHumanDateAndTime(Date date); static String dateToHuman(Date date); static Timestamp getCurrentTimeStamp(); static Date daysBefore(Date dateInst, int numDays); static Date daysBeforeNow(int numDays); static Date daysAfter(Date dateInst, int numDays); static Date daysAfterWithoutTimeZone(Date dateInst, int numDays); static Date daysAfterNow(int numDays); static Date startOfDay(Date dateInst); static Date endOfDay(Date dateInst); static Date startOfDayUsingOutputTimeZone(Date dateInst); static Date endOfDayUsingOutputTimeZone(Date dateInst); static final long MILLIS_IN_SECOND; static final long MILLIS_IN_MINUTE; static final long MILLIS_IN_HOUR; static final long MILLIS_IN_DAY; static final int LAST_HOUR_OF_DAY; static final int LAST_MINUTE; static final int LAST_SECOND; static final int LAST_MILLISECOND; }
@Test(expected = IllegalArgumentException.class) public void testDaysAfterTodayWithNegativeNumber(){ assertEquals("-1 days after now ","",ExtDateTimeUtils.daysAfterNow(-1)); }
@Test public void testDaysAfterTodayWithPositiveNumber(){ Calendar cal = new GregorianCalendar(); cal.setTime(new Date()); cal.add(Calendar.DAY_OF_WEEK, 1); Calendar date = new GregorianCalendar(); date.setTime(ExtDateTimeUtils.daysAfterNow(1)); assertEquals("1 day after now ",cal.get(Calendar.DAY_OF_WEEK),date.get(Calendar.DAY_OF_WEEK)); }