diff --git a/R/utils.R b/R/utils.R
index 946b5a2..ef582ea 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -162,6 +162,7 @@ JSEvals <- function(list) {
 #' @keywords internal
 shouldEval <- function(options) {
   if (is.list(options)) {
+    if (inherits(options, "POSIXlt")) return(FALSE)
     if ((n <- length(options)) == 0) return(FALSE)
     # use numeric indices as names (remember JS indexes from 0, hence -1 here)
     if (is.null(names(options)))