(date): Interpret the date, L/M/N, as YYYY/MM/DD

if L >= 1000, otherwise as MM/DD/YY.  With this change,
date --date=DATE accepts dates like those in an RCS log listing.

diff --git a/lib/getdate.y b/lib/getdate.y
index 6988604..8e35c92 100644 (file)
--- a/lib/getdate.y
+++ b/lib/getdate.y
@@ -312,9 +312,22 @@ date       : tUNUMBER '/' tUNUMBER {
            yyDay = $3;
        }
        | tUNUMBER '/' tUNUMBER '/' tUNUMBER {
-           yyMonth = $1;
-           yyDay = $3;
-           yyYear = $5;
+         /* Interpret as YYYY/MM/DD if $1 >= 1000, otherwise as MM/DD/YY.
+            The goal in recognizing YYYY/MM/DD is solely to support legacy
+            machine-generated dates like those in an RCS log listing.  If
+            you want portability, use the ISO 8601 format.  */
+         if ($1 >= 1000)
+           {
+             yyYear = $1;
+             yyMonth = $3;
+             yyDay = $5;
+           }
+         else
+           {
+             yyMonth = $1;
+             yyDay = $3;
+             yyYear = $5;
+           }
        }
        | tUNUMBER tSNUMBER tSNUMBER {
            /* ISO 8601 format.  yyyy-mm-dd.  */