date - convert from posix timestamp in %Y-%m-%d in R -

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I have the date in this format: 

  1397758632   
 and I need to convert these formats into these dates% Y-% m-% d How can I do this? My timezone is GTM. Using the .POSIXct () function:  
  as.POSIXct (x = "1397758632", original = "1960-01-01", tz = "GMT ")   
 I have this error  
  as error. POSIXlt.character (x, tz, ...): Character string is not in standard denial format   
 How do I get a readable data? 
 
 
 Some things if you defined a variable  x = "1397758632"  You do not need to declare it again, just use  x  for example, //  as.POSIXct (x, origin = "1970-01-01" , tz = "GMT")   
 2,  x = "1397758632" / code> is actually a variable variable, try  str (x)  You want to declare it numerically,  x = 1397758632  and you're all good.  
 Finally, to add  as.Date ()  if you just want a date and do not stamp full time.  
 Then something like this: 
  x = 1397758632 POSIXct (x, origin = "1970-01-01", tz = "GMT") as.Date (as.POSIXct (x, origin = "1970-01-01", tz = "GMT")) #date only

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