diff --git a/DESCRIPTION b/DESCRIPTION
index 10b44ced77..e462eebcd4 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Package: plotly
 Type: Package
 Title: Interactive, publication-quality graphs online.
-Version: 0.5.18
+Version: 0.5.19
 Authors@R: c(person("Chris", "Parmer", role = c("aut", "cre"),
     email = "chris@plot.ly"),
     person("Scott", "Chamberlain", role = "aut",
diff --git a/NEWS b/NEWS
index 3e9a48217a..3ec054e9c8 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,7 @@
+0.5.19 -- 23 January 2015.
+
+Support class conversion such as as.Date() within ggplot code.
+
 0.5.18 -- 22 January 2015.
 
 Return proper filepath when filename contains directories.
diff --git a/R/plotly-package.r b/R/plotly-package.r
index 1a00944894..a39c58d874 100644
--- a/R/plotly-package.r
+++ b/R/plotly-package.r
@@ -7,7 +7,7 @@
 #' \itemize{
 #'  \item Package: plotly
 #'  \item Type: Package
-#'  \item Version: 0.5.18
+#'  \item Version: 0.5.19
 #'  \item Date: 2014-03-07
 #'  \item License: MIT
 #' }
diff --git a/R/plotly.R b/R/plotly.R
index db8978d135..7fb269893e 100644
--- a/R/plotly.R
+++ b/R/plotly.R
@@ -82,7 +82,7 @@ For more help, see https://plot.ly/R or contact <chris@plot.ly>.")
   
   # public attributes/methods that the user has access to
   pub <- list(username=username, key=key, filename="from api", fileopt=NULL,
-              version="0.5.18")
+              version="0.5.19")
   priv <- list()
   
   pub$makecall <- function(args, kwargs, origin) {
diff --git a/R/trace_generation.R b/R/trace_generation.R
index ca7b8b94ca..5477972f5d 100644
--- a/R/trace_generation.R
+++ b/R/trace_generation.R
@@ -41,13 +41,24 @@ layer2traces <- function(l, d, misc) {
   
   ## For non-numeric data on the axes, we should take the values from
   ## the original data.
-  for (axis.name in c("x", "y")){
-    if (!misc$is.continuous[[axis.name]]){
+  for (axis.name in c("x", "y")) {
+    if (!misc$is.continuous[[axis.name]]) {
       aes.names <- paste0(axis.name, c("", "end", "min", "max"))
       aes.used <- aes.names[aes.names %in% names(g$aes)]
       for(a in aes.used) {
         col.name <- g$aes[aes.used]
-        data.vec <- l$data[[col.name]]
+        dtemp <- l$data[[col.name]]
+        if (is.null(dtemp)) {
+          if (!inherits(g$data[[paste0(a, ".name")]], "NULL")) {
+            # Handle the case where as.Date() is passed in aes argument.
+            if (class(g$data[[a]]) != class(g$data[[paste0(a, ".name")]])) {
+              g$data[[a]] <- g$data[[paste0(a, ".name")]]
+              data.vec <- g$data[[a]]
+            }
+          }
+        } else {
+          data.vec <- dtemp
+        }
         
         # For some plot types, we overwrite `data` with `prestats.data`.
         pdata.vec <- misc$prestats.data[[a]]
@@ -274,11 +285,11 @@ toBasic <- list(
       g
     }
   },
-  path=function(g){
+  path=function(g) {
     group2NA(g, "path")
   },
-  line=function(g){
-    g$data <- g$data[order(g$data$x),]
+  line=function(g) {
+    g$data <- g$data[order(g$data$x), ]
     group2NA(g, "path")
   },
   boxplot=function(g) {
@@ -352,14 +363,14 @@ toBasic <- list(
 #' @export
 #' @return list of geom info.
 #' @author Toby Dylan Hocking
-group2NA <- function(g, geom){
+group2NA <- function(g, geom) {
   poly.list <- split(g$data, g$data$group)
   is.group <- names(g$data) == "group"
   poly.na.df <- data.frame()
-  for(i in seq_along(poly.list)){
-    no.group <- poly.list[[i]][,!is.group,drop=FALSE]
-    na.row <- no.group[1,]
-    na.row[,c("x", "y")] <- NA
+  for (i in seq_along(poly.list)) {
+    no.group <- poly.list[[i]][, !is.group, drop=FALSE]
+    na.row <- no.group[1, ]
+    na.row[, c("x", "y")] <- NA
     poly.na.df <- rbind(poly.na.df, no.group, na.row)
   }
   g$data <- poly.na.df
@@ -370,7 +381,7 @@ group2NA <- function(g, geom){
 
 # Convert basic geoms to traces.
 geom2trace <- list(
-  path=function(data, params){
+  path=function(data, params) {
     list(x=data$x,
          y=data$y,
          name=params$name,