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-rw-r--r--mdoc.712
1 files changed, 9 insertions, 3 deletions
diff --git a/mdoc.7 b/mdoc.7
index 11341d22..4061c427 100644
--- a/mdoc.7
+++ b/mdoc.7
@@ -805,7 +805,7 @@ then the macro accepts an arbitrary number of arguments.
.It Sx \&Cd Ta Yes Ta Yes Ta >0
.It Sx \&Cm Ta Yes Ta Yes Ta n
.It Sx \&Db Ta \&No Ta \&No Ta 1
-.It Sx \&Dd Ta \&No Ta \&No Ta >0
+.It Sx \&Dd Ta \&No Ta \&No Ta n
.It Sx \&Dt Ta \&No Ta \&No Ta n
.It Sx \&Dv Ta Yes Ta Yes Ta n
.It Sx \&Dx Ta Yes Ta Yes Ta n
@@ -1470,7 +1470,7 @@ This is the mandatory first macro of any
manual.
Its syntax is as follows:
.Pp
-.D1 Pf \. Sx \&Dd Ar date
+.D1 Pf \. Sx \&Dd Op Ar date
.Pp
The
.Ar date
@@ -1480,7 +1480,7 @@ which signifies the current manual revision date dictated by
.Xr cvs 1 ,
or instead a valid canonical date as specified by
.Sx Dates .
-If a date does not conform, the current date is used instead.
+If a date does not conform or is empty, the current date is used.
.Pp
Examples:
.D1 \&.Dd $\&Mdocdate$
@@ -2718,6 +2718,12 @@ Heirloom troff, the other significant troff implementation accepting
.Pp
.Bl -dash -compact
.It
+An empty
+.Sq \&Dd
+macro in groff prints
+.Dq Epoch .
+In mandoc, it resolves to the current date.
+.It
The \es (font size), \em (font colour), and \eM (font filling colour)
font decoration escapes are all discarded in mandoc.
.It