Add ISO_FORMAT option & update usage message accordingly

README.org

@@ -52,7 +52,7 @@
      Occurs once every four years (1 + 4 = 5) and is inserted between
      the 59th and 60th days of the Season of Chaos.
 ** THE YEAR
-|     |    |    |    |    |     |   | ST | BT | PD | PP | SO |     |     |    |    |    |    |    |   | SM | BT | PD | PP | SO |     |
+|     |    |    |    |    |     |   | SM | BT | PD | PP | SO |     |     |    |    |    |    |    |   | SM | BT | PD | PP | SO |     |
 |-----+----+----+----+----+-----+---+----+----+----+----+----+-----+-----+----+----+----+----+----+---+----+----+----+----+----+-----|
 | Jan |  1 |  2 |  3 |  4 |   5 |   |  1 |  2 |  3 |  4 |  5 | Chs | Jul |  5 |  6 |  7 |  8 |  9 |   | 40 | 41 | 42 | 43 | 44 | Cfn |
 |     |  6 |  7 |  8 |  9 |  10 |   |  6 |  7 |  8 |  9 | 10 |     |     | 10 | 11 | 12 | 13 | 14 |   | 45 | 46 | 47 | 48 | 49 |     |

ddate.c

@@ -43,6 +43,9 @@
    15th of Confusion, 3180:
    - call out adherents of the wrong fruit
 
+   3181-Afm-51 Jim Wisniewski <wisnij+ddate@gmail.com>
+   - added ISO_FORMAT option
+
    FIVE TONS OF FLAX
 */
 
@@ -54,6 +57,12 @@
 
 #define OLD_IMMEDIATE_FMT
 
+/* If you wish to use the ISO 8601 format for aneristic dates (y-m-d), as
+ * opposed to the Commonwealth format, define ISO_FORMAT.
+ */
+
+/* #define ISO_FORMAT */
+
 /* If you wish to use the US format for aneristic dates (m-d-y), as opposed to
  * the Commonwealth format, define US_FORMAT.
  */
@@ -214,20 +223,33 @@ main (int argc, char *argv[]) {
     if (argc-pi==3){ 
 	int moe=atoi(argv[pi]), larry=atoi(argv[pi+1]), curly=atoi(argv[pi+2]);
 	hastur=makeday(
-#ifdef US_FORMAT
-	    moe,larry,
+#ifdef ISO_FORMAT
+	    larry,curly,moe
 #else
+# ifdef US_FORMAT
+	    moe,larry,
+# else
 	    larry,moe,
+# endif
+	    curly
 #endif
-	    curly);
+	);
 	if (hastur.season == -1) {
 		printf("Invalid date -- out of range\n");
 		return -1;
 	}
 	fnord=fnord?fnord:default_fmt;
     } else if (argc!=pi) { 
       usage:
-	fprintf(stderr,("usage: %s [+format] [day month year]\n"), argv[0]);
+	fprintf(stderr,("usage: %s [+format] ["
+#if defined(ISO_FORMAT)
+	                "year month day"
+#elif defined(US_FORMAT)
+	                "month day year"
+#else
+	                "day month year"
+#endif
+	                "]\n"), argv[0]);
 	exit(1);
     } else {
 	t= time(NULL);