diff --git a/module/project/lang/de.php b/module/project/lang/de.php
index 6c534ce902..8d5e7b6c94 100644
--- a/module/project/lang/de.php
+++ b/module/project/lang/de.php
@@ -252,6 +252,7 @@ $lang->project->error->budgetGe0        = '『Budget』must be greater than or e
 $lang->project->error->budgetNumber     = '『Budget』must be numbers.';
 $lang->project->error->productNotEmpty  = "Please link {$lang->productCommon}s or create {$lang->productCommon}s.";
 $lang->project->error->emptyBranch      = 'Branch can not be empty!';
+$lang->project->error->endLessBegin     = 'The end date must be greater than the start date.';
 
 $lang->project->tenThousand    = 'Ten Thousand';
 $lang->project->hundredMillion = 'Hundred Million';
diff --git a/module/project/lang/en.php b/module/project/lang/en.php
index 4f9d17918a..f7826b4ee0 100644
--- a/module/project/lang/en.php
+++ b/module/project/lang/en.php
@@ -252,6 +252,7 @@ $lang->project->error->budgetGe0        = '『Budget』must be greater than or e
 $lang->project->error->budgetNumber     = '『Budget』must be numbers.';
 $lang->project->error->productNotEmpty  = "Please link {$lang->productCommon}s or create {$lang->productCommon}s.";
 $lang->project->error->emptyBranch      = 'Branch can not be empty!';
+$lang->project->error->endLessBegin     = 'The end date must be greater than the start date.';
 
 $lang->project->tenThousand    = 'Ten Thousand';
 $lang->project->hundredMillion = 'Hundred Million';
diff --git a/module/project/lang/fr.php b/module/project/lang/fr.php
index 1e6ff88f05..5277f7f9c4 100644
--- a/module/project/lang/fr.php
+++ b/module/project/lang/fr.php
@@ -252,6 +252,7 @@ $lang->project->error->budgetGe0        = '『Budget』must be greater than or e
 $lang->project->error->budgetNumber     = '『Budget』must be numbers.';
 $lang->project->error->productNotEmpty  = "Please link {$lang->productCommon}s or create {$lang->productCommon}s.";
 $lang->project->error->emptyBranch      = 'Branch can not be empty!';
+$lang->project->error->endLessBegin     = 'The end date must be greater than the start date.';
 
 $lang->project->tenThousand    = 'Ten Thousand';
 $lang->project->hundredMillion = 'Hundred Million';
diff --git a/module/project/lang/zh-cn.php b/module/project/lang/zh-cn.php
index 4fe494d64e..71a42e42f0 100644
--- a/module/project/lang/zh-cn.php
+++ b/module/project/lang/zh-cn.php
@@ -244,6 +244,7 @@ $lang->project->error->budgetGe0        = '『预算』金额必须大于等于0
 $lang->project->error->budgetNumber     = '『预算』金额必须为数字。';
 $lang->project->error->productNotEmpty  = "请关联{$lang->productCommon}或创建{$lang->productCommon}。";
 $lang->project->error->emptyBranch      = '分支不能为空！';
+$lang->project->error->endLessBegin     = '计划结束日期不能小于计划开始日期！';
 
 $lang->project->tip = new stdclass();
 $lang->project->tip->closed     = '该项目已是关闭状态，无须关闭。';
diff --git a/module/project/model.php b/module/project/model.php
index 0a7290144b..23250ce2be 100755
--- a/module/project/model.php
+++ b/module/project/model.php
@@ -1454,6 +1454,12 @@ class projectModel extends model
      */
     public function activate(int $projectID, object $project) :array|false
     {
+        if($project->begin > $project->end)
+        {
+            dao::$errors['end'] = $this->lang->project->error->endLessBegin;
+            return false;
+        }
+
         $oldProject = $this->projectTao->fetchProjectInfo($projectID);
 
         $daoSuccess = $this->projectTao->doActivate($projectID, $project);
diff --git a/module/project/ui/activate.html.php b/module/project/ui/activate.html.php
index cf7e1a448f..8436c5713f 100644
--- a/module/project/ui/activate.html.php
+++ b/module/project/ui/activate.html.php
@@ -21,14 +21,13 @@ formPanel
             set::label($lang->execution->beginAndEnd),
             inputGroup
             (
-                input
+                datePicker
                 (
-                    set::control('date'),
                     set::name('begin'),
                     set::value($newBegin)
                 ),
                 $lang->execution->to,
-                input
+                datePicker
                 (
                     set::control('date'),
                     set::name('end'),