java.lang.IllegalArgumentException: Illegal pattern character 'O'

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java.lang.IllegalArgumentException: Illegal pattern character 'O'	at java.text.SimpleDateFormat.compile(SimpleDateFormat.java:678)	at java.text.SimpleDateFormat.initialize(SimpleDateFormat.java:497)	at java.text.SimpleDateFormat.(SimpleDateFormat.java:446)	at java.text.SimpleDateFormat.(SimpleDateFormat.java:427)