This is the main method used by applications at the end of the build process to create a usable formatter.
Subsequent changes to this builder do not affect the returned formatter.
The returned formatter may not support both printing and parsing. The methods {@link PeriodFormatter#isPrinter()} and{@link PeriodFormatter#isParser()} will help you determine the stateof the formatter. @return the newly created formatter @throws IllegalStateException if the builder can produce neither a printer nor a parser
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