INVALID_DATETIME_PATTERN error class
Unrecognized datetime pattern: <pattern>.
ILLEGAL_CHARACTER
Illegal pattern character found in datetime pattern: <c>. Please provide legal character.
LENGTH
Too many letters in datetime pattern: <pattern>. Please reduce pattern length.
SECONDS_FRACTION
Cannot detect a seconds fraction pattern of variable length. Please make sure the pattern contains 'S', and does not contain illegal characters.