[R] plotting date data over couple of months

[vamshi999]

I am sorry i was not clear in my early post.... 

I have used the below code to change my data into date format.. 

r<-as.POSIXlt(paste(data2$date,data2$time))
library(gsubfn)
library(chron)
r<-as.chron(r)

data2$date<-strftime(strptime(r, format="(%m/%d/%y %H:%M:%S)"),"%Y-%m-%d")
data2$time<-strftime(strptime(r, format="(%m/%d/%y %H:%M:%S)"),"%H:%M:%S")

now i have a date variable in the below format.. 

"2011-04-20" 

while plotting dates using the above format.. i was getting the x-axis in
this way.. 

        ----------------------
        2011-04-29    2011-05-05

but i want the values in my x-axis to be in this format.. 

                 ------------------ 
               27 28 29 30 1 2 3 4 
               April             May 


about the error plots.... i was not able to compute the mean and sd values
.. 

My data has  the following columns.. 

date, time, height..

 this is the bird data which we recorded.. so i have date, time, height at
which the birds are being detected . so now i want to plot errorbar for
total no.of birds detected on each day.. 

for a simple plot ..i used.. counts<-table(data$date).. i was able to get
the count on each day.. 

then.. barplot(counts).. but i was not able to calculate the mean and sd for
counts.. 

thank you 

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