title: 'origin' must be supplied&unambiguous format
body: <p>I am a beginner in R. I have the following problem - I want to load a CSV file into R and then convert it into a XTS object. However, after the operation I get an error. First, a small snippet of the data:</p>
  
  <pre><code>a=read.csv('/Users/..../Desktop/SYNEKTIK.csv',h=T)
  head(a)
    Name     Date      Open  High   Low Close Volume
  1 SYNEKTIK 20110809  5.76  8.23  5.76  8.23  28062
  2 SYNEKTIK 20110810  9.78  9.78  8.10  8.13   9882
  3 SYNEKTIK 20110811  9.00  9.00  9.00  9.00   2978
  4 SYNEKTIK 20110812  9.70  9.70  8.90  9.60   5748
  5 SYNEKTIK 20110816  9.70 11.00  9.70 11.00  23100
  6 SYNEKTIK 20110818 10.90 11.00 10.90 10.90    319
  </code></pre>
  
  <p>The following does not work:</p>
  
  <pre><code>w=xts(a[,-1],order.by=as.POSIXct(a[,1]))
  </code></pre>
  
  <p>As it produces the following error:</p>
  
  <blockquote>
    <p>error'as.POSIXlt.character(as.character(x), ...)':
      character string is not in a standard unambiguous format</p>
  </blockquote>
  
  <p>Another try that did not work:</p>
  
  <pre><code>a=a[,-1]
  head(a)
    Date      Open  High   Low Close Volume
  1 20110809  5.76  8.23  5.76  8.23  28062
  2 20110810  9.78  9.78  8.10  8.13   9882
  3 20110811  9.00  9.00  9.00  9.00   2978
  4 20110812  9.70  9.70  8.90  9.60   5748
  5 20110816  9.70 11.00  9.70 11.00  23100
  6 20110818 10.90 11.00 10.90 10.90    319
  
  
  w=xts(a[,-1],order.by=as.POSIXct(a[,1]))
  </code></pre>
  
  <blockquote>
    <p>error 'as.POSIXct.numeric(a[, 1])':'origin' must be supplied</p>
  </blockquote>
  
  <p>Finally, when I saved the date in the following format: yyyy -mm - dd Everything turned out right, and I could convert into an XTS object, why?</p>