/**
* @param testY candidate year
* @param testM candidate month in range 1 to 12
* @param testD candidate day in range 1 to 31
* @param leniant succeed even if the day and month might be ambiguous
* @return Formatted date if certain date fields are OK and wouldn't be OK in a different order,
* else null
*/
private String populateDateFieldsIfUnambiguous(int testY, int testM, int testD, boolean leniant) {
if ((testY < 1600) || (testY > 4500)) {
// Year does not fit within what Outlook allows, probably not what is intended
return null;
}
int firstAllowableDay = leniant ? 1 : 13;
if ((testD < firstAllowableDay) || (testD > 31)) {
// Either an invalid date or could be a month number if guessed date string order wrong
return null;
}
if ((testM < 1) || (testM > 12)) {
// Not a valid month
return null;
}
ICalTimeZone tzUTC = ICalTimeZone.getUTC();
GregorianCalendar cal = new GregorianCalendar(tzUTC);
cal.set(testY, testM - 1, 1, 0, 0);
if (testD > cal.getActualMaximum(Calendar.DAY_OF_MONTH)) return null;
cal.set(Calendar.DAY_OF_MONTH, testD);
SimpleDateFormat ymd = new SimpleDateFormat("yyyy-MM-dd");
ymd.setCalendar(cal);
return ymd.format(cal.getTime());
}
