Mine

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<configurations>
	<configuration>
		<validators>
			<validator method="write" class="datetime" name="task_date" required="true">
				<parameter name="formats">
					<parameter>
						<parameter name="format">dd MMMM yyyy</parameter>
						<parameter name="locale">fr_CA</parameter> <!-- if left out it will use the default locale -->
					</parameter>
				</parameter>
			</validator>
		</validators>
	</configuration>
</configurations>