这个是不是FusionCharts的bug啊~~~

目前在用FusionChars做甘特图，发现一个奇怪的问题.
因为2008年是闰年，所以2月份有29天，问题就是出在这里，我动态计算出月份数据XML，填充给FCF_Gantt.swf,这个Falsh画出的甘特图多了一格...我把2月份改为28天，就又好了.这是不是FusionCharts的bug啊，或者说FusionCharts根本就不支持闰年，平年的计算？
XML数据源如下   Gantt.xml

<chart dateFormat='dd/mm/yyyy' hoverCapBorderColor='2222ff' hoverCapBgColor='e1f5ff' ganttWidthPercent='60' ganttLineAlpha='80' canvasBorderColor='024455' canvasBorderThickness='0' gridBorderColor='4567aa' gridBorderAlpha='20'>
<categories bgColor="4567aa" fontColor="ff0000">
   <category start="1/02/2008" end="31/05/2008" align="center" name="2008年" alpha="" font="Verdana" fontColor="ffffff" isBold="1" fontSize="16"/>
</categories>
<categories  bgColor='4567aa' fontColor='ff0000'>
	<category start='1/2/2008' end='31/05/2008' align='center' name='Months'  alpha='' font='Verdana' fontColor='ffffff' isBold='1' fontSize='16' />
</categories>
<categories bgColor="ffffff" fontColor="1288dd" fontSize="12">
	  <category start="1/2/2008" end="29/2/2008" align="center" name="2月" isBold="1"/>
	  <category start="1/3/2008" end="31/3/2008" align="center" name="3月" isBold="1"/>
	  <category start="1/4/2008" end="30/4/2008" align="center" name="4月" isBold="1"/>
	  <category start="1/5/2008" end="31/5/2008" align="center" name="5月" isBold="1"/>
</categories>
<processes headerText='Tasks' fontColor='ffffff' fontSize='10' isBold='1' isAnimated='1' bgColor='4567aa'  headerVAlign='right' headerbgColor='4567aa' headerFontColor='ffffff' headerFontSize='16' width='80' align='left'>
	<process Name='Wrting' id='1' />
	<process Name='Signing' id='2' />
	<process Name='Financing' id='3' />
	<process Name='Permission' id='4' />
	<process Name='Plumbing' id='5' />
	<process Name='Terrace' id='6' />
	<process Name='Inspection' id='7' />
	<process Name='Wood Work' id='8' />
	<process Name='Interiors' id='9' />
	<process Name='Shifting' id='10' />
</processes>
<dataTable showProcessName='1' nameAlign='left' fontColor='000000' fontSize='10' isBold='1' headerBgColor='00ffff' headerFontColor='4567aa' headerFontSize='11' vAlign='right' align='left'>
	<dataColumn width='70' headerfontcolor='ffffff' headerBgColor='4567aa' bgColor='eeeeee'  headerColor='ffffff' headerText='Start' isBold='0'>
		<text label='7/3/2005' /> 
		<text label='6/4/2005' />
		<text label='1/5/2005' />
		<text label='13/5/2005' />
		<text label='2/5/2005' />
		<text label='1/6/2005' />
		<text label='15/6/2005' /> 
		<text label='22/6/2005' />
		<text label='18/6/2005' />
		<text label='15/7/2005' />
	</dataColumn>
	<dataColumn width='70' headerfontcolor='ffffff'  bgColor='eeeeee' headerbgColor='4567aa'  fontColor='000000' headerText='Finish' isBold='0'>
		<text label='22/4/2005' /> 
		<text label='12/5/2005' />
		<text label='2/6/2005' />
		<text label='19/6/2005' /> 
		<text label='19/6/2005' />
		<text label='19/7/2005' />
		<text label='11/8/2005' />
		<text label='5/8/2005' /> 
		<text label='22/7/2005' />
		<text label='11/8/2005' />
	</dataColumn>

	<dataColumn align='center' headerfontcolor='ffffff'  headerbgColor='4567aa'  bgColor='eeeeee' headerText='Dur.' width='35' isBold='0'>
		<text label='150' /> 
		<text label='340' />
		<text label='60' />
		<text label='20' /> 
		<text label='30' />
		<text label='45' />
		<text label='40' />
		<text label='102' /> 
		<text label='60' />
		<text label='30' />
		<text label='90' />
		<text label='30' />
	</dataColumn>
	<dataColumn headerbgColor='4567aa' headerfontcolor='ffffff'  align='right' fontColor='000000' bgColor='4567aa' bgAlpha='25' headerText='Cost' >
		<text label='$400' /> 
		<text label='$890' />
		<text label='$1234' />
		<text label='$230' /> 
		<text label='$450' />
		<text label='$120' />
		<text label='$1780' />
		<text label='$3330' /> 
		<text label='$890' />
		<text label='$1110' />
		<text label='$260' />
		<text label='$460' />
	</dataColumn>

</dataTable>
<tasks  width='10' >
	<task name='Planned' processId='1' start='14/2/2008' end='18/4/2008' id='1-1' color='4567aa' height='10' topPadding='5' animation='0'/>
	<task name='Actual' processId='1' start='7/3/2008' end='22/4/2008' id='1' color='cccccc' alpha='100'  topPadding='19' height='10' />
</tasks>
</chart>

下面是关键日期XML数据

<categories bgColor="ffffff" fontColor="1288dd" fontSize="12">
	  <category start="1/2/2008" end="29/2/2008" align="center" name="2月" isBold="1"/>
	  <category start="1/3/2008" end="31/3/2008" align="center" name="3月" isBold="1"/>
	  <category start="1/4/2008" end="30/4/2008" align="center" name="4月" isBold="1"/>
	  <category start="1/5/2008" end="31/5/2008" align="center" name="5月" isBold="1"/>
</categories>