Parsing a string to date format in java defaults date to 1 and month to January

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Because you used YYYY when you needed yyyy and July 20, 2015 was a Monday. You wanted something like

String userDateFormat = "HHmm 'hrs', EEEE, MMMM dd, yyyy";
SimpleDateFormat userDateFormatter = new SimpleDateFormat(
        userDateFormat);
String reference_date = "2000 hrs, Monday, July 20, 2015";

which then outputs

2000 hrs, Monday, July 20, 2015

Then SimpleDateFormat Javadoc says (in part)

Letter    Date or Time Component  Presentation    Examples
G         Era designator          Text            AD
y         Year                    Year            1996; 96
Y         Week year               Year            2009; 09

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