I wanted to put this on the R Wiki, but found the suitable pages were 
read-only.  I wanted to get it out in public to save people work.

I was converting dates like "2009/03/26 01:00:00 AM" using as.POSIXct.  I found 
that using a format of "%Y/%m/%d %I:%M:%S %p" did not work correctly to 
distinguish AM from PM.  Both were converted into the same timestamp.  Indeed, 
what I found worked was affixing a space after the string timestamp to produce 
"2009/03/26 01:00:00 AM " or "2009/03/26 01:00:00 PM ".  That works.

Didn't see this documented in the associated pages anywhere. 

I wonder if the help system might benefit from user comments like for instance 
PHP has?

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