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Nicolas Flammel
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When I create a Date object after parsing like...

String eDate = "27-AUG-24";
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yy");
ParsePosition pos = new ParsePosition(0);
sdf.setLenient(false);
java.util.Date endDate = sdf.parse(eDate, pos);
System.out.println(endDate);

When printing the endDate I get the date as
Wed Aug 27 00:00:00 GMT+05:30 1924

Works fine till 26-AUG-24.

But when I do the same after changing the date format like...
String eDate = "27-AUG-2024";
SimpleDateFormat sdf = new SimpleDateFormat("dd-MMM-yyyy");
ParsePosition pos = new ParsePosition(0);
sdf.setLenient(false);
java.util.Date endDate = sdf.parse(eDate, pos);
System.out.println(endDate);

Here I get correct results.
Tue Aug 27 00:00:00 GMT+05:30 2024

Why is there a descrepancy between the two parsing formats?
 
somkiat puisungnoen
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Year: For formatting, if the number of pattern letters is 2, the year is truncated to 2 digits; otherwise it is interpreted as a number.
For parsing, if the number of pattern letters is more than 2, the year is interpreted literally, regardless of the number of digits. So using the pattern "MM/dd/yyyy", "01/11/12" parses to Jan 11, 12 A.D.

For parsing with the abbreviated year pattern ("y" or "yy"), SimpleDateFormat must interpret the abbreviated year relative to some century. It does this by adjusting dates to be within 80 years before and 20 years after the time the SimpleDateFormat instance is created. For example, using a pattern of "MM/dd/yy" and a SimpleDateFormat instance created on Jan 1, 1997, the string "01/11/12" would be interpreted as Jan 11, 2012 while the string "05/04/64" would be interpreted as May 4, 1964. During parsing, only strings consisting of exactly two digits, as defined by Character.isDigit(char), will be parsed into the default century. Any other numeric string, such as a one digit string, a three or more digit string, or a two digit string that isn't all digits (for example, "-1"), is interpreted literally. So "01/02/3" or "01/02/003" are parsed, using the same pattern, as Jan 2, 3 AD. Likewise, "01/02/-3" is parsed as Jan 2, 4 BC.

 
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