diff --git a/wmclock/configure.ac b/wmclock/configure.ac
index 82a2382..8909b6d 100644
--- a/wmclock/configure.ac
+++ b/wmclock/configure.ac
@@ -21,6 +21,8 @@ AC_DEFINE_UNQUOTED(MONTH_XPM, ["${LangDir}/month.xpm"])
 AC_DEFINE_UNQUOTED(WEEKDAY_XPM, ["${LangDir}/weekday.xpm"])
 AC_MSG_NOTICE([configuring for ${with_lang} day-of-week and month names...])
 
+AC_SUBST(DATE, "esyscmd(head -n 1 ChangeLog | cut -d' ' -f1 | tr -d '\n')")
+
 PKG_CHECK_MODULES([x11], [x11])
 PKG_CHECK_MODULES([xpm], [xpm])
 PKG_CHECK_MODULES([xext], [xext])
diff --git a/wmclock/wmclock.1.in b/wmclock/wmclock.1.in
index 39a3410..93fd077 100644
--- a/wmclock/wmclock.1.in
+++ b/wmclock/wmclock.1.in
@@ -21,7 +21,7 @@
 .TP \\$1
 ..
 .\" ----------------------------------------------------------------
-.TH wmclock 1 "2014-Dec-11" "Version @VERSION@"
+.TH wmclock 1 @DATE@ "Version @VERSION@"
 .\" ----------------------------------------------------------------
 .SH NAME
 wmclock \- A dockable clock for the Window Maker window manager