NA instead of time stamp

  I was wondering why I get <NA> instead of the timestamp in the following.
Thanks.

dataDir <- file.path(wd)
localRaw <- read.csv(file.path(dataDir,"LOCAL.csv"), as.is=T,stringsAsFactors

= FALSE)

localRaw[1:2,]

   Year Month Day hour minute second Temp1mab Temp7mab Temp14mab Salinity1mab
1 2009    10   5    0      0      0   11.288   13.675    13.743       33.513
2 2009    10   5    0     15      0   11.258   13.684    13.716       33.514
   O21mab waveht wavedir waveperiod depth mab along across
1      0 54.926   1.600        340  9.09   .    NA     NA
2      0 55.574   1.525        340  9.09   .    NA     NA

DateTime<-with(localRaw,paste(Year,Month,Day,hour,minute))
DateTime<-as.POSIXct(DateTime, format="%m/%d/%Y %H:%M")
localCond_2009<-xts(localRaw ,order.by=DateTime)
localCond_2009[1:2,]

      Year   Month Day  hour minute second Temp1mab Temp7mab Temp14mab
<NA> "2009" "10"  " 5" " 0" " 0"   "0"    "11.288" "13.675" "13.743"
<NA> "2009" "10"  " 5" " 0" "15"   "0"    "11.258" "13.684" "13.716"
      Salinity1mab O21mab waveht   wavedir waveperiod depth    mab along
across
<NA> "33.513"     "0"    "54.926" "1.600" "340.0"    " 9.090" "." NA
NA
<NA> "33.514"     "0"    "55.574" "1.525" "340.0"    " 9.090" "." NA
NA

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