Dear all,
I have dataset which contains date and time in the format
"yearmonthdayhour". I can read in these data correctly as follows:
mydata <- read.csv("pm10_corine_gridcel_hourly_2011.csv", header = TRUE)
mydata$date <- as.POSIXct(strptime(mydata$date, format = "%Y%m%d%H",
tz="UTC"))
However, midnight is defined as 24:00 in my original file (so the end of the
day), while the POSIXct function changes this to 0:00 (the beginning of the
next day).
So, my data now go from January 1 2011 1:00 to Januari 1 2012 0:00, in stead
of December 31 2011 24:00.
summary(mydata$date)
Min. 1st Qu. Median
"2011-01-01 01:00:00" "2011-04-02 06:45:00" "2011-07-02 12:30:00"
Mean 3rd Qu. Max.
"2011-07-02 12:30:00" "2011-10-01 18:15:00" "2012-01-01 00:00:00"
I would like to change this 0:00 to 24:00 again since I want to include
these values in daily averages of the previous day (and not of the next
day). So the day of the month should also be diminished by 1.
I have tried extracting the hours which are 0 and converting them to 24, but
then I can't paste them back in the date/time of the original data.fram
again.
Are there maybe other solutions?
Thanks in advance,
Sandy
ifelse (as.POSIXlt(mydata[24,1])$hour = "0",as.POSIXlt(mydata[24,1])$hour =
"24"
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