In the lyx-users list is it often asked how to suppress the default date. The 
solution is simply to add
\date{}
to the preamble.
The attached patch adds a document option to do this. When the user sets this option, he still can later overwrite this be specifying a date, because the option is only for the default date.

This is a fileformat change, the lyx2lyx part follows when this goes in. This 
patch fixes
http://www.lyx.org/trac/ticket/5823

regards Uwe
Index: BufferParams.cpp
===================================================================
--- BufferParams.cpp	(revision 31002)
+++ BufferParams.cpp	(working copy)
@@ -363,6 +363,7 @@
 	columns = 1;
 	listings_params = string();
 	pagestyle = "default";
+	suppress_date = false;
 	// white is equal to no background color
 	backgroundcolor = lyx::rgbFromHexName("#ffffff");
 	compressed = false;
@@ -539,6 +540,8 @@
 	} else if (token == "\\master") {
 		lex.eatLine();
 		master = lex.getString();
+	} else if (token == "\\suppress_date") {
+		lex >> suppress_date;
 	} else if (token == "\\language") {
 		readLanguage(lex);
 	} else if (token == "\\inputencoding") {
@@ -863,6 +866,7 @@
 	   << "\n\\use_bibtopic " << convert<string>(use_bibtopic)
 	   << "\n\\use_indices " << convert<string>(use_indices)
 	   << "\n\\paperorientation " << string_orientation[orientation]
+	   << "\n\\suppress_date " << convert<string>(suppress_date)
 	   << '\n';
 	   if (backgroundcolor != lyx::rgbFromHexName("#ffffff"))
 		os << "\\backgroundcolor " << lyx::X11hexname(backgroundcolor) << '\n';
@@ -1459,6 +1463,10 @@
 	// Line spacing
 	lyxpreamble += from_utf8(spacing().writePreamble(tclass.provides("SetSpace")));
 
+	// date
+	if (suppress_date)
+		lyxpreamble += "\\date{}\n";
+
 	// PDF support.
 	// * Hyperref manual: "Make sure it comes last of your loaded
 	//   packages, to give it a fighting chance of not being over-written,
Index: BufferParams.h
===================================================================
--- BufferParams.h	(revision 31002)
+++ BufferParams.h	(working copy)
@@ -259,6 +259,8 @@
 	///
 	std::string master;
 	///
+	bool suppress_date;
+	///
 	std::string float_placement;
 	///
 	unsigned int columns;
Index: frontends/qt4/GuiDocument.cpp
===================================================================
--- frontends/qt4/GuiDocument.cpp	(revision 31002)
+++ frontends/qt4/GuiDocument.cpp	(working copy)
@@ -932,6 +932,8 @@
 		this, SLOT(change_adaptor()));
 	connect(latexModule->childDocPB, SIGNAL(clicked()),
 		this, SLOT(browseMaster()));
+	connect(latexModule->suppressDateCB, SIGNAL(clicked()),
+		this, SLOT(change_adaptor()));
 
 	// postscript drivers
 	for (int n = 0; tex_graphics[n][0]; ++n) {
@@ -1777,6 +1779,9 @@
 	// preamble
 	preambleModule->apply(bp_);
 
+	// date
+	bp_.suppress_date = latexModule->suppressDateCB->isChecked();
+
 	// biblio
 	bp_.setCiteEngine(ENGINE_BASIC);
 
@@ -2148,6 +2153,9 @@
 	// preamble
 	preambleModule->update(bp_, id());
 
+	// date
+	latexModule->suppressDateCB->setChecked(bp_.suppress_date);
+
 	// biblio
 	biblioModule->citeDefaultRB->setChecked(
 		bp_.citeEngine() == ENGINE_BASIC);
Index: frontends/qt4/ui/LaTeXUi.ui
===================================================================
--- frontends/qt4/ui/LaTeXUi.ui	(revision 31002)
+++ frontends/qt4/ui/LaTeXUi.ui	(working copy)
@@ -1,57 +1,49 @@
-<ui version="4.0" >
+<ui version="4.0">
  <class>LaTeXUi</class>
- <widget class="QWidget" name="LaTeXUi" >
-  <property name="geometry" >
+ <widget class="QWidget" name="LaTeXUi">
+  <property name="geometry">
    <rect>
     <x>0</x>
     <y>0</y>
     <width>341</width>
-    <height>301</height>
+    <height>319</height>
    </rect>
   </property>
-  <property name="windowTitle" >
+  <property name="windowTitle">
    <string/>
   </property>
-  <layout class="QGridLayout" >
-   <property name="margin" >
-    <number>9</number>
-   </property>
-   <property name="spacing" >
-    <number>6</number>
-   </property>
-   <item row="0" column="0" colspan="3" >
-    <widget class="QGroupBox" name="groupBox" >
-     <property name="title" >
+  <layout class="QGridLayout" name="gridLayout">
+   <item row="0" column="0" colspan="3">
+    <widget class="QGroupBox" name="groupBox">
+     <property name="title">
       <string>Document &amp;class</string>
      </property>
-     <layout class="QGridLayout" >
-      <property name="margin" >
+     <layout class="QGridLayout">
+      <property name="margin">
        <number>9</number>
       </property>
-      <property name="spacing" >
+      <property name="spacing">
        <number>6</number>
       </property>
-      <item row="0" column="0" >
-       <widget class="QComboBox" name="classCO" >
-        <property name="maxVisibleItems" >
+      <item row="0" column="0">
+       <widget class="QComboBox" name="classCO">
+        <property name="maxVisibleItems">
          <number>20</number>
         </property>
        </widget>
       </item>
-      <item row="0" column="1" >
-       <widget class="QPushButton" name="layoutPB" >
-        <property name="sizePolicy" >
-         <sizepolicy>
-          <hsizetype>0</hsizetype>
-          <vsizetype>0</vsizetype>
+      <item row="0" column="1">
+       <widget class="QPushButton" name="layoutPB">
+        <property name="sizePolicy">
+         <sizepolicy hsizetype="Fixed" vsizetype="Fixed">
           <horstretch>0</horstretch>
           <verstretch>0</verstretch>
          </sizepolicy>
         </property>
-        <property name="toolTip" >
+        <property name="toolTip">
          <string>Click to select a local document class definition file</string>
         </property>
-        <property name="text" >
+        <property name="text">
          <string>&amp;Local Layout...</string>
         </property>
        </widget>
@@ -59,57 +51,57 @@
      </layout>
     </widget>
    </item>
-   <item row="1" column="0" colspan="3" >
-    <widget class="QGroupBox" name="optionsGB" >
-     <property name="title" >
+   <item row="1" column="0" colspan="3">
+    <widget class="QGroupBox" name="optionsGB">
+     <property name="title">
       <string>Class options</string>
      </property>
-     <layout class="QGridLayout" >
-      <property name="margin" >
+     <layout class="QGridLayout">
+      <property name="margin">
        <number>9</number>
       </property>
-      <property name="spacing" >
+      <property name="spacing">
        <number>6</number>
       </property>
-      <item rowspan="2" row="0" column="1" >
-       <layout class="QVBoxLayout" >
-        <property name="margin" >
+      <item row="0" column="1" rowspan="2">
+       <layout class="QVBoxLayout">
+        <property name="spacing">
+         <number>6</number>
+        </property>
+        <property name="margin">
          <number>0</number>
         </property>
-        <property name="spacing" >
-         <number>6</number>
-        </property>
         <item>
-         <widget class="QLineEdit" name="defaultOptionsLE" >
-          <property name="toolTip" >
+         <widget class="QLineEdit" name="defaultOptionsLE">
+          <property name="toolTip">
            <string>The options that are predefined in the layout file. Click to the left to select/deselect.</string>
           </property>
-          <property name="readOnly" >
+          <property name="readOnly">
            <bool>true</bool>
           </property>
          </widget>
         </item>
         <item>
-         <widget class="QLineEdit" name="optionsLE" />
+         <widget class="QLineEdit" name="optionsLE"/>
         </item>
        </layout>
       </item>
-      <item row="0" column="0" >
-       <widget class="QCheckBox" name="defaultOptionsCB" >
-        <property name="toolTip" >
+      <item row="0" column="0">
+       <widget class="QCheckBox" name="defaultOptionsCB">
+        <property name="toolTip">
          <string>Enable to use the options that are predefined in the layout file</string>
         </property>
-        <property name="text" >
+        <property name="text">
          <string>P&amp;redefined:</string>
         </property>
        </widget>
       </item>
-      <item row="1" column="0" >
-       <widget class="QLabel" name="optionsL" >
-        <property name="text" >
+      <item row="1" column="0">
+       <widget class="QLabel" name="optionsL">
+        <property name="text">
          <string>Cust&amp;om:</string>
         </property>
-        <property name="buddy" >
+        <property name="buddy">
          <cstring>optionsLE</cstring>
         </property>
        </widget>
@@ -117,29 +109,29 @@
      </layout>
     </widget>
    </item>
-   <item row="2" column="0" >
-    <widget class="QLabel" name="psdriverL" >
-     <property name="text" >
+   <item row="2" column="0">
+    <widget class="QLabel" name="psdriverL">
+     <property name="text">
       <string>&amp;Graphics driver:</string>
      </property>
-     <property name="buddy" >
+     <property name="buddy">
       <cstring>psdriverCO</cstring>
      </property>
     </widget>
    </item>
-   <item row="2" column="1" >
-    <widget class="QComboBox" name="psdriverCO" >
-     <property name="duplicatesEnabled" >
+   <item row="2" column="2">
+    <widget class="QComboBox" name="psdriverCO">
+     <property name="duplicatesEnabled">
       <bool>false</bool>
      </property>
     </widget>
    </item>
-   <item row="2" column="2" >
-    <spacer>
-     <property name="orientation" >
+   <item row="2" column="3">
+    <spacer name="horizontalSpacer_1">
+     <property name="orientation">
       <enum>Qt::Horizontal</enum>
      </property>
-     <property name="sizeHint" >
+     <property name="sizeHint" stdset="0">
       <size>
        <width>261</width>
        <height>22</height>
@@ -147,47 +139,47 @@
      </property>
     </spacer>
    </item>
-   <item row="3" column="0" colspan="3" >
-    <widget class="QGroupBox" name="childDocGB" >
-     <property name="toolTip" >
+   <item row="3" column="0" colspan="4">
+    <widget class="QGroupBox" name="childDocGB">
+     <property name="toolTip">
       <string>Select if the current document is included to a master file</string>
      </property>
-     <property name="statusTip" >
+     <property name="statusTip">
       <string/>
      </property>
-     <property name="title" >
+     <property name="title">
       <string>Select de&amp;fault master document</string>
      </property>
-     <property name="checkable" >
+     <property name="checkable">
       <bool>true</bool>
      </property>
-     <layout class="QGridLayout" >
-      <property name="margin" >
+     <layout class="QGridLayout">
+      <property name="margin">
        <number>9</number>
       </property>
-      <property name="spacing" >
+      <property name="spacing">
        <number>6</number>
       </property>
-      <item row="0" column="0" >
-       <widget class="QLabel" name="childDocLA" >
-        <property name="text" >
+      <item row="0" column="0">
+       <widget class="QLabel" name="childDocLA">
+        <property name="text">
          <string>&amp;Master:</string>
         </property>
-        <property name="buddy" >
+        <property name="buddy">
          <cstring>childDocLE</cstring>
         </property>
        </widget>
       </item>
-      <item row="0" column="2" >
-       <widget class="QPushButton" name="childDocPB" >
-        <property name="text" >
+      <item row="0" column="2">
+       <widget class="QPushButton" name="childDocPB">
+        <property name="text">
          <string>&amp;Browse...</string>
         </property>
        </widget>
       </item>
-      <item row="0" column="1" >
-       <widget class="QLineEdit" name="childDocLE" >
-        <property name="toolTip" >
+      <item row="0" column="1">
+       <widget class="QLineEdit" name="childDocLE">
+        <property name="toolTip">
          <string>Enter the name of the default master document</string>
         </property>
        </widget>
@@ -195,12 +187,28 @@
      </layout>
     </widget>
    </item>
-   <item row="4" column="0" >
-    <spacer>
-     <property name="orientation" >
+   <item row="4" column="0" colspan="4">
+    <widget class="QCheckBox" name="suppressDateCB">
+     <property name="enabled">
+      <bool>true</bool>
+     </property>
+     <property name="sizePolicy">
+      <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
+       <horstretch>0</horstretch>
+       <verstretch>0</verstretch>
+      </sizepolicy>
+     </property>
+     <property name="text">
+      <string>Suppress default date on front page</string>
+     </property>
+    </widget>
+   </item>
+   <item row="5" column="1">
+    <spacer name="verticalSpacer">
+     <property name="orientation">
       <enum>Qt::Vertical</enum>
      </property>
-     <property name="sizeHint" >
+     <property name="sizeHint" stdset="0">
       <size>
        <width>20</width>
        <height>2</height>
@@ -216,7 +224,7 @@
   <tabstop>psdriverCO</tabstop>
  </tabstops>
  <includes>
-  <include location="local" >qt_i18n.h</include>
+  <include location="local">qt_i18n.h</include>
  </includes>
  <resources/>
  <connections>
@@ -226,11 +234,11 @@
    <receiver>defaultOptionsLE</receiver>
    <slot>setEnabled(bool)</slot>
    <hints>
-    <hint type="sourcelabel" >
+    <hint type="sourcelabel">
      <x>63</x>
      <y>79</y>
     </hint>
-    <hint type="destinationlabel" >
+    <hint type="destinationlabel">
      <x>237</x>
      <y>82</y>
     </hint>

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