The following example shows how you can set a custom format string on a Flex DateField control by setting the formatString property using MXML and ActionScript.
Full code after the jump.
<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/07/23/setting-a-custom-format-string-on-a-datefield-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
layout="vertical"
verticalAlign="top"
backgroundColor="white">
<mx:ApplicationControlBar dock="true">
<mx:Form styleName="plain">
<mx:FormItem label="formatString:" direction="horizontal">
<mx:Button label="YYYY/MM/DD"
click="dateField.formatString='YYYY/MM/DD';" />
<mx:Button label="MM/DD/YYYY"
click="dateField.formatString='MM/DD/YYYY';" />
<mx:Button label="DD/MM/YYYY"
click="dateField.formatString='DD/MM/YYYY';" />
</mx:FormItem>
</mx:Form>
</mx:ApplicationControlBar>
<mx:DateField id="dateField"
formatString="YYYY-MM-DD" />
</mx:Application>
View source is enabled in the following example.





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