Dates and times from Excel
The chron package stores times as a fraction of the day. See R News 4/1.
On Sun, Feb 22, 2009 at 8:26 PM, David Scott <d.scott at auckland.ac.nz> wrote:
I have used xlsReadWrite to read data from an Excel spreadsheet. I had a problem with converting times of the day so that I could create POSIXct date-time objects. I was wondering if there was a better solution. Excel stores times of the day as fractions of a day so I wrote a function to convert the fraction to a number of seconds, extract the hours, minutes and seconds and output it in ISO standard format (%H:%M:%S). Given a date obtained from an Excel date using as.Date I could then make up my POSIXct date-time objects. This seems like it would be such a standard operation that there may be existing solutions that I have missed. Any comments, advice? David Scott
_________________________________________________________________
David Scott Department of Statistics
The University of Auckland, PB 92019
Auckland 1142, NEW ZEALAND
Phone: +64 9 373 7599 ext 85055 Fax: +64 9 373 7018
Email: d.scott at auckland.ac.nz
Graduate Officer, Department of Statistics
Director of Consulting, Department of Statistics
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