[FLEX-24464] FallbackDateTimeFormatter - error thrown when format a date which only contain time

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK Previous
• Fix Version/s: Adobe Flex SDK Previous
• Component/s: Spark: Formatters
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Browser: Internet Explorer 8.x; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 15/Jul/10 03:32
• Updated: 01/Apr/11 17:21
• Resolved: 19/Jul/10 14:59

Description

Steps to reproduce:
1.create a date which only has time: var date7:Date = new Date('2:57 PM');

2.create a DateTimeFormatter instance with dateStyle 'long' and timeStyle 'long':
<s:DateTimeFormatter id="dtFormatterLL" dateStyle="long" timeStyle="long"/>

3.format the date defined in step 1: dtFormatterLL.format(date7)

Actual Results:
It throw ReferenceError: Error #1069: Property NaN not found on _AS3_.vec.Vector.<String> and there is no default value.

Expected Results:
The return value from DateTimeFormatter is empty string.

Investigation Result:
according to FallbackDateTimeFormatter source code line 153 and 155: WEEKDAYLABELS[dateTime.getDay()],the return value of dateTime.getDay()will be the index of WEEKDAYLABELS. When we format a date like, "2:57 PM", method getDay()return 'NaN' which is a invalid index, so error thrown.

Notes:
Issue happens at FallbackDateTimeFormatter source code line 153 and 155.
You can find sample code in attachment.