String Parsing a Time

I need to obtain a time in the format of "07:30 am" (not case-sensitive). I'm reading a file which has this in the format "07:30am". Eventually I will be constructing a DateTime from this, so I just need to get this back with a space before the am/pm part.

I can detect the occurrence of the a or p using this:

if(startString.IndexOfAny("ap".ToCharArray()) != -1)
 {
 
 }
 

What's the best ways to do this? I'm guessing I will end up with two strings that can be concatenated with a space? Can Split be used with the above snippet to achieve this?

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