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

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Illegal pattern character 'T'
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Illegal pattern character 'Y'
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)

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