I have this function:
private static boolean isDate(String rowData, String pattern) {
try {
DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern, Locale.getDefault());
LocalDate.parse(rowData, formatter).atStartOfDay(ZoneId.systemDefault()).toInstant();
return true;
} catch (Exception e) {
return false;
}
}
and
private static final String ORACLE_DATE_FORMAT1 = "MMM d, yyyy";
private static final String ORACLE_DATE_FORMAT2 = "dd MMM yyyy";
System.out.println("<--------------------------->");
System.out.println("value -> " + value);
System.out.println("isDate -> " + (isDate(value, ORACLE_DATE_FORMAT1) || isDate(value, ORACLE_DATE_FORMAT2)));
System.out.println("<--------------------------->");
but I get this result:
value -> 1 Aug 2020
isDate -> false
<--------------------------->
<--------------------------->
value -> 31 Jul 2099
isDate -> true
This works if you change ORACLE_DATE_FORMAT2
to d MMM yyyy
. As per the documentation, when the date is specified as dd
, it expects a 2-character representation of the day of the month (e.g. 01 Aug 2020).
Note that this change will pick up both 1 Aug 2020
and 01 Aug 2020
successfully.
<--------------------------->
value -> 01 Aug 2020
isDate -> true
<--------------------------->
<--------------------------->
value -> 1 Aug 2020
isDate -> true
<--------------------------->