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...tePro) write.xls(rancho,file="H:\\Chris A\\Brain Injury\\Data\\rancho3.xls") Error in write.xls(rancho, file = "H:\\Chris A\\Brain Injury\\Data\\rancho3.xls") : "POSIXt" is not a valid entry (try: unassigned/double/numeric/integer/logical/character/factor/NA/oledate/oletime/oledatetime/isodate/isotime/isodatetime/link/formula/mixed/mixedCharacter/mixedFactor) write.xls(rancho,file="H:\\Chris A\\Brain Injury\\Data\\rancho3.xls",dateTimeAs = "oledatetime") Error in write.xls(rancho, file = "H:\\Chris A\\Brain Injury\\Data\\rancho3.xls"...

...dateTimeAs". This argument is used to decide how Excel date and time values should be handled if no explicit "colClasses" argument has been given. Possible values are: - "numeric" (numeric value) - "oledatetime" (numeric value of class oleDate, oleTime or oleDateTime which triggers formatting as date/time string). - "isodatetime" (character value) - factors now handled in the Delphi code by a call to the R function as.factor - fixed NA factors bug (thanks to Mark W. Kimpel!) - range checks disabled again...

Dear all, I often use dates and times in analyses. I just can't figure out how to format my date or time column in R. So, apparently R sees the date as something other than date (character). Let's say I am opening a CSV file, one of the columns of which is a date or time. How do I specify that when opening the file? Thanks for the help, Jim --