Tweaks for c88356.

git-svn-id: https://svn.r-project.org/R/trunk@88357 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: hornik

src/library/base/R/zzz.R

@@ -540,6 +540,7 @@ matrix(c("!", "hexmode",
          "merge", "default",
          "months", "Date",
          "months", "POSIXt",
+         "mtfrm", "Date",
          "mtfrm", "POSIXct",
          "mtfrm", "POSIXlt",
          "mtfrm", "default",