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Index: bin/sh/parser.c
===================================================================
--- bin/sh/parser.c
+++ bin/sh/parser.c
@@ -2102,6 +2102,60 @@
}
break;
+ /*
+ * Print time or date as per provided format.
+ */
+ case 'D': {
+ char tfmt[128], *cpyend;
+ time_t now;
+
+ if (fmt[1] != '{') {
+ /*
+ * "\D" but not "\D{", so treat the '\'
+ * literally and rewind fmt to treat 'D'
+ * literally next iteration.
+ */
+ ps[i] = '\\';
+ fmt--;
+ break;
+ }
+ /*
+ * Consume the 'D' character and try to copy fmt from
+ * after '{' until '}'.
+ * Don't consume '{' from fmt yet.
+ */
+ fmt++;
+ cpyend = memccpy(tfmt, fmt + 1, '}', sizeof(tfmt));
+ if (cpyend == NULL) {
+ /*
+ * Format too long or '}' not found, so
+ * ignore "\D{" altogether.
+ * The loop will do i++, but nothing was
+ * written to ps, so do i-- here.
+ * "fmt++" will consume the '{'.
+ */
+ i--;
+ break;
+ }
+ /*
+ * Either way, consume fmt until '}'. The loop will
+ * do fmt++ to finally consume the '}'.
+ */
+ if (cpyend - tfmt == 1) {
+ /* "\D{}" is documented to mean %X. */
+ fmt++;
+ strcpy(tfmt, "%X");
+ } else {
+ fmt += cpyend - tfmt;
+ /* Truncate tfmt before '}'. */
+ *--cpyend = '\0';
+ }
+ now = time(NULL);
+ i += strftime(&ps[i], PROMPTLEN - i - 1,
+ tfmt, localtime(&now)) - 1;
+ break;
+ }
+
/*
* Hostname.
*
Index: bin/sh/sh.1
===================================================================
--- bin/sh/sh.1
+++ bin/sh/sh.1
@@ -1428,6 +1428,16 @@
may include any of the following formatting sequences,
which are replaced by the given information:
.Bl -tag -width indent
+.It Li \eD{format}
+The current time in
+.Xr strftime 3
+.Ar format .
+The braces are required.
+Empty
+.Ar format
+is equivalent to
+\&%X,
+national representation of the time.
.It Li \eH
This system's fully-qualified hostname (FQDN).
.It Li \eh

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