diff --git a/module/project/ui/create.html.php b/module/project/ui/create.html.php
index 58b8014eb0..6e06f97698 100644
--- a/module/project/ui/create.html.php
+++ b/module/project/ui/create.html.php
@@ -163,6 +163,7 @@ formPanel
     on::change('[name=multiple]', 'toggleMultiple'),
     on::change('[name=future]', 'toggleBudget'),
     on::change('[name=newProduct]', 'addProduct'),
+    $config->systemMode != 'light' ? on::change('#begin, #end, #parent', 'checkDate') : null,
     formRow
     (
         formGroup
@@ -342,6 +343,18 @@ formPanel
             )
         )
     ),
+    formRow
+    (
+        setID('dateTip'),
+        setClass('hidden'),
+        formGroup
+        (
+            set::label(''),
+            span(setID('beginLess'), setClass('text-warning hidden'), html($lang->project->beginLessThanParent)),
+            span(setID('endGreater'), setClass('text-warning hidden'), html($lang->project->endGreatThanParent)),
+            a(setClass('underline text-warning'), set::href('javascript:;'), on::click("ignoreTip('dateTip')"), $lang->project->ignore)
+        )
+    ),
     formGroup
     (
         set::label($lang->project->days),
diff --git a/module/project/ui/edit.html.php b/module/project/ui/edit.html.php
index 5df38fefb6..9693101acc 100644
--- a/module/project/ui/edit.html.php
+++ b/module/project/ui/edit.html.php
@@ -176,6 +176,7 @@ formPanel
     on::change('#parent', 'setParentProgram'),
     on::change('#begin, [name=delta]', 'computeEndDate'),
     on::change('#begin, #end', 'computeWorkDays'),
+    on::change('#begin, #end, #parent', 'checkDate'),
     on::change('[name^=products]', 'productChange'),
     on::change('[name^=branch]', 'branchChange'),
     on::change('[name=future]', 'toggleBudget'),
@@ -358,6 +359,18 @@ formPanel
         )
     ),
     formRow
+    (
+        setID('dateTip'),
+        setClass('hidden'),
+        formGroup
+        (
+            set::label(''),
+            span(setID('beginLess'), setClass('text-warning hidden'), html($lang->project->beginLessThanParent)),
+            span(setID('endGreater'), setClass('text-warning hidden'), html($lang->project->endGreatThanParent)),
+            a(setClass('underline text-warning'), set::href('javascript:;'), on::click("ignoreTip('dateTip')"), $lang->project->ignore)
+        )
+    ),
+    formRow
     (
         setClass($delta == 999 ? 'hidden' : ''),
         formGroup