WinXP, R version 2.10.1:

> s1<- strftime("2009/12/15 11:55:00 PM", format="%Y/%m/%d %I:%M:%S %p", tz="GMT", usetz=FALSE)
> print(s1)
[1] "2009/12/15 11:55:00 AM"

> s2<- strftime("2009/12/16 12:00:00 AM", format="%Y/%m/%d %I:%M:%S %p", tz="GMT", usetz=FALSE)
> print(s2)
[1] "2009/12/16 12:00:00 PM"

> s3<- strftime("2009/12/16 00:00:00 AM", format="%Y/%m/%d %I:%M:%S %p", tz="GMT", usetz=FALSE)
> print(s3)
[1] "2009/12/16 12:00:00 AM"
>

-- 
    Jan Galkowski, 617.444.4995 
   
  ""Eppur si muove." --Galilei 




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