Ruby on rails Rails:DateTime.strTime需要12小时无填充

我正在尝试使用Datetime.strTime解析指纹读取器的xml文件，但是时间是12小时，没有填充，并且似乎没有strftime选项来读取此文件。我试过了，但没有成功

从API

Time (Hour, Minute, Second, Subsecond):
  %H - Hour of the day, 24-hour clock, zero-padded (00..23)
  %k - Hour of the day, 24-hour clock, blank-padded ( 0..23)
  %I - Hour of the day, 12-hour clock, zero-padded (01..12)
  %l - Hour of the day, 12-hour clock, blank-padded ( 1..12)

xml数据包中的一个片段

<ROW Pin="142" Name="142" sTime="8/12/2013 8:14 PM" VerifyFlag="Fingerpint" MachineName="Office" Abnormite=""/>
<ROW Pin="163" Name="163" sTime="8/12/2013 8:16 PM" VerifyFlag="Fingerpint" MachineName="Office" Abnormite=""/>
<ROW Pin="103" Name="103" sTime="8/13/2013 12:03 AM" VerifyFlag="Fingerpint" MachineName="Office" Abnormite=""/>
<ROW Pin="101" Name="101" sTime="8/13/2013 12:03 AM" VerifyFlag="Fingerpint" MachineName="Office" Abnormite=""/>
<ROW Pin="401" Name="401" sTime="8/13/2013 12:36 AM" VerifyFlag="Fingerpint" MachineName="Office" Abnormite=""/>
<ROW Pin="505" Name="505" sTime="8/13/2013 2:17 AM" VerifyFlag="Fingerpint" MachineName="Office" Abnormite=""/>

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使用

%l

选项进行解析似乎很好

凌晨2:17

> DateTime.strptime("8/13/2013 2:17 AM", "%m/%d/%Y %l:%M %p")
 => Tue, 13 Aug 2013 02:17:00 +0000 

> DateTime.strptime("8/13/2013 2:17 PM", "%m/%d/%Y %l:%M %p")                                                                                 
 => Tue, 13 Aug 2013 14:17:00 +0000

下午2:17

> DateTime.strptime("8/13/2013 2:17 AM", "%m/%d/%Y %l:%M %p")
 => Tue, 13 Aug 2013 02:17:00 +0000 

> DateTime.strptime("8/13/2013 2:17 PM", "%m/%d/%Y %l:%M %p")                                                                                 
 => Tue, 13 Aug 2013 14:17:00 +0000