diff --git a/db/update.sql b/db/update.sql
index 212cd97e..351cf8b4 100644
--- a/db/update.sql
+++ b/db/update.sql
@@ -49,3 +49,10 @@ ALTER TABLE `Room` ADD `description` TEXT NULL AFTER `map_url`;
 -- Dashboard
 ALTER TABLE `AngelTypes` ADD `show_on_dashboard` BOOLEAN NOT NULL AFTER `contact_email`;
 UPDATE `AngelTypes` SET `show_on_dashboard` = TRUE;
+
+-- Work Log
+CREATE TABLE `engelsystem`.`UserWorkLog` ( `id` INT NOT NULL AUTO_INCREMENT , `user_id` INT NOT NULL , `work_hours` DECIMAL NOT NULL , `comment` VARCHAR(200) NOT NULL , `created_user_id` INT NOT NULL , `created_timestamp` INT NOT NULL , PRIMARY KEY (`id`), INDEX (`user_id`), INDEX (`created_user_id`)) ENGINE = InnoDB;
+ALTER TABLE `UserWorkLog` ADD FOREIGN KEY (`created_user_id`) REFERENCES `User`(`UID`) ON DELETE CASCADE ON UPDATE CASCADE; ALTER TABLE `UserWorkLog` ADD FOREIGN KEY (`user_id`) REFERENCES `User`(`UID`) ON DELETE CASCADE ON UPDATE CASCADE;
+ALTER TABLE `UserWorkLog` ADD INDEX(`created_timestamp`);
+INSERT INTO `Privileges` (`id`, `name`, `desc`) VALUES (NULL, 'admin_user_worklog', 'Manage user work log entries.');
+ALTER TABLE `UserWorkLog` CHANGE `work_hours` `work_hours` DECIMAL(10,2) NOT NULL;
diff --git a/includes/controller/user_worklog_controller.php b/includes/controller/user_worklog_controller.php
new file mode 100644
index 00000000..ba91534b
--- /dev/null
+++ b/includes/controller/user_worklog_controller.php
@@ -0,0 +1,189 @@
+<?php
+
+/**
+ * Delete a work log entry.
+ */
+function user_worklog_delete_controller()
+{
+    global $user;
+    
+    $request = request();
+    $userWorkLog = UserWorkLog($request->input('user_worklog_id'));
+    if (empty($userWorkLog)) {
+        redirect(user_link($user));
+    }
+    $user_source = User($userWorkLog['user_id']);
+    
+    if ($request->has('confirmed')) {
+        UserWorkLog_delete($userWorkLog);
+        
+        success(_('Work log entry deleted.'));
+        redirect(user_link($user_source));
+    }
+    
+    return [
+        UserWorkLog_delete_title(),
+        UserWorkLog_delete_view($user_source, $userWorkLog)
+    ];
+}
+
+/**
+ * Edit work log for user.
+ */
+function user_worklog_edit_controller()
+{
+    global $user;
+    
+    $request = request();
+    $userWorkLog = UserWorkLog($request->input('user_worklog_id'));
+    if (empty($userWorkLog)) {
+        redirect(user_link($user));
+    }
+    $user_source = User($userWorkLog['user_id']);
+    
+    if ($request->has('submit')) {
+        list ($valid, $userWorkLog) = user_worklog_from_request($userWorkLog);
+        
+        if ($valid) {
+            UserWorkLog_update($userWorkLog);
+            
+            success(_('Work log entry updated.'));
+            redirect(user_link($user_source));
+        }
+    }
+    
+    return [
+        UserWorkLog_edit_title(),
+        UserWorkLog_edit_view($user_source, $userWorkLog)
+    ];
+}
+
+/**
+ *
+ * @param UserWorkLog $userWorkLog            
+ * @return [bool $valid, UserWorkLog $userWorkLog]
+ */
+function user_worklog_from_request($userWorkLog)
+{
+    $request = request();
+    
+    $valid = true;
+    
+    $userWorkLog['work_hours'] = $request->input('work_hours');
+    if (! preg_match("/[0-9]+(\.[0-9]+)?/", $userWorkLog['work_hours'])) {
+        $valid = false;
+        error(_('Please enter work hours in format ##[.##].'));
+    }
+    
+    $userWorkLog['comment'] = $request->input('comment');
+    if (empty($userWorkLog['comment'])) {
+        $valid = false;
+        error(_('Please enter a comment.'));
+    }
+    
+    return [
+        $valid,
+        $userWorkLog
+    ];
+}
+
+/**
+ * Add work log entry to user.
+ */
+function user_worklog_add_controller()
+{
+    global $user;
+    
+    $request = request();
+    $user_source = User($request->input('user_id'));
+    if (empty($user_source)) {
+        redirect(user_link($user));
+    }
+    
+    $userWorkLog = UserWorkLog_new($user_source);
+    
+    if ($request->has('submit')) {
+        list ($valid, $userWorkLog) = user_worklog_from_request($userWorkLog);
+        
+        if ($valid) {
+            UserWorkLog_create($userWorkLog);
+            
+            success(_('Work log entry created.'));
+            redirect(user_link($user_source));
+        }
+    }
+    
+    return [
+        UserWorkLog_add_title(),
+        UserWorkLog_add_view($user_source, $userWorkLog)
+    ];
+}
+
+/**
+ * Link to work log entry add for given user.
+ *
+ * @param User $user            
+ */
+function user_worklog_add_link($user)
+{
+    return page_link_to('user_worklog', [
+        'action' => 'add',
+        'user_id' => $user['UID']
+    ]);
+}
+
+/**
+ * Link to work log entry edit.
+ *
+ * @param UserWorkLog $userWorkLog            
+ */
+function user_worklog_edit_link($userWorkLog)
+{
+    return page_link_to('user_worklog', [
+        'action' => 'edit',
+        'user_worklog_id' => $userWorkLog['id']
+    ]);
+}
+
+/**
+ * Link to work log entry delete.
+ *
+ * @param UserWorkLog $userWorkLog        
+ * @param array[] $parameters    
+ */
+function user_worklog_delete_link($userWorkLog, $parameters = [])
+{
+    return page_link_to('user_worklog', array_merge([
+        'action' => 'delete',
+        'user_worklog_id' => $userWorkLog['id']
+    ], $parameters));
+}
+
+/**
+ * Work log entry actions
+ */
+function user_worklogs_controller()
+{
+    global $user, $privileges;
+    
+    if (! in_array('admin_user_worklog', $privileges)) {
+        redirect(user_link($user));
+    }
+    
+    $request = request();
+    $action = $request->input('action');
+    if (! $request->has('action')) {
+        redirect(user_link($user));
+    }
+    
+    switch ($action) {
+        case 'add':
+            return user_worklog_add_controller();
+        case 'edit':
+            return user_worklog_edit_controller();
+        case 'delete':
+            return user_worklog_delete_controller();
+    }
+}
+
+?>
\ No newline at end of file
diff --git a/includes/controller/users_controller.php b/includes/controller/users_controller.php
index a2a28410..c763cd48 100644
--- a/includes/controller/users_controller.php
+++ b/includes/controller/users_controller.php
@@ -242,7 +242,9 @@ function user_controller()
             $shifts,
             $user['UID'] == $user_source['UID'],
             $tshirt_score,
-            in_array('admin_active', $privileges)
+            in_array('admin_active', $privileges),
+            in_array('admin_user_worklog', $privileges),
+            UserWorkLogsForUser($user_source)
         )
     ];
 }
diff --git a/includes/includes.php b/includes/includes.php
index e8e5ce29..e316e550 100644
--- a/includes/includes.php
+++ b/includes/includes.php
@@ -27,6 +27,7 @@ $includeFiles = [
     __DIR__ . '/../includes/model/UserDriverLicenses_model.php',
     __DIR__ . '/../includes/model/UserGroups_model.php',
     __DIR__ . '/../includes/model/User_model.php',
+    __DIR__ . '/../includes/model/UserWorkLog_model.php',
     __DIR__ . '/../includes/model/ValidationResult.php',
 
     __DIR__ . '/../includes/view/AngelTypes_view.php',
@@ -45,6 +46,7 @@ $includeFiles = [
     __DIR__ . '/../includes/view/UserDriverLicenses_view.php',
     __DIR__ . '/../includes/view/UserHintsRenderer.php',
     __DIR__ . '/../includes/view/User_view.php',
+    __DIR__ . '/../includes/view/UserWorkLog_view.php',
 
     __DIR__ . '/../includes/controller/angeltypes_controller.php',
     __DIR__ . '/../includes/controller/event_config_controller.php',
@@ -56,6 +58,7 @@ $includeFiles = [
     __DIR__ . '/../includes/controller/users_controller.php',
     __DIR__ . '/../includes/controller/user_angeltypes_controller.php',
     __DIR__ . '/../includes/controller/user_driver_licenses_controller.php',
+    __DIR__ . '/../includes/controller/user_worklog_controller.php',
 
     __DIR__ . '/../includes/helper/graph_helper.php',
     __DIR__ . '/../includes/helper/internationalization_helper.php',
diff --git a/includes/model/UserWorkLog_model.php b/includes/model/UserWorkLog_model.php
new file mode 100644
index 00000000..d9628e1d
--- /dev/null
+++ b/includes/model/UserWorkLog_model.php
@@ -0,0 +1,111 @@
+<?php
+use Engelsystem\Database\Db;
+
+/**
+ * Load a single work log entry.
+ * @param int $user_worklog_id
+ */
+function UserWorkLog($user_worklog_id) {
+    return Db::selectOne("SELECT * FROM `UserWorkLog` WHERE `id`=?", [$user_worklog_id]);
+}
+
+/**
+ * Returns all work log entries for a user.
+ * @param User $user
+ */
+function UserWorkLogsForUser($user) {
+    return Db::select("SELECT * FROM `UserWorkLog` WHERE `user_id`=? ORDER BY `created_timestamp`", [$user['UID']]);
+}
+
+/**
+ * Delete a work log entry.
+ * @param UserWorkLog $userWorkLog
+ */
+function UserWorkLog_delete($userWorkLog)
+{
+    $user_source = $userWorkLog['user_id'];
+    $result = Db::delete("DELETE FROM `UserWorkLog` WHERE `id`=?", [
+        $userWorkLog['id']
+    ]);
+    
+    engelsystem_log(sprintf('Delete work log for %s, %s hours, %s',
+        User_Nick_render($user_source),
+        $userWorkLog['work_hours'],
+        $userWorkLog['comment']));
+    
+    return $result;
+}
+
+/**
+ * Update work log entry (only work hours and comment)
+ * @param UserWorkLog $userWorkLog
+ */
+function UserWorkLog_update($userWorkLog)
+{
+    $user_source = $userWorkLog['user_id'];
+
+    $result = Db::update("UPDATE `UserWorkLog` SET
+        `work_hours`=?,
+        `comment`=?
+        WHERE `id`=?", [
+            $userWorkLog['work_hours'],
+            $userWorkLog['comment'],
+            $userWorkLog['id']
+        ]);
+    
+    engelsystem_log(sprintf('Updated work log for %s, %s hours, %s',
+        User_Nick_render($user_source),
+        $userWorkLog['work_hours'],
+        $userWorkLog['comment']));
+    
+    return $result;
+}
+
+/**
+ * Create a new work log entry
+ * @param UserWorkLog $userWorkLog
+ */
+function UserWorkLog_create($userWorkLog)
+{
+    global $user;
+    
+    $user_source = $userWorkLog['user_id'];
+    
+    $result = Db::insert("INSERT INTO `UserWorkLog` (
+            `user_id`,
+            `work_hours`,
+            `comment`,
+            `created_user_id`,
+            `created_timestamp`
+        )
+        VALUES (?, ?, ?, ?, ?)", [
+            $userWorkLog['user_id'],
+            $userWorkLog['work_hours'],
+            $userWorkLog['comment'],
+            $user['UID'],
+            time()
+        ]);
+    
+    engelsystem_log(sprintf('Added work log entry for %s, %s hours, %s',
+        User_Nick_render($user_source),
+        $userWorkLog['work_hours'],
+        $userWorkLog['comment']));
+    
+    return $result;
+}
+
+/**
+ * New user work log entry
+ *
+ * @param array[] $user            
+ */
+function UserWorkLog_new($user)
+{
+    return [
+        'user_id' => $user['UID'],
+        'work_hours' => 0,
+        'comment' => ''
+    ];
+}
+
+?>
\ No newline at end of file
diff --git a/includes/model/User_model.php b/includes/model/User_model.php
index fa24aac1..b398cefe 100644
--- a/includes/model/User_model.php
+++ b/includes/model/User_model.php
@@ -26,7 +26,7 @@ function User_delete($user_id)
 function User_tshirt_score($user) {
     $shift_sum_formula = config('shift_sum_formula');
     
-    $result = DB::selectOne('
+    $result_shifts = DB::selectOne('
         SELECT ROUND((' . $shift_sum_formula . ') / 3600, 2) AS `tshirt_score`
         FROM `User` LEFT JOIN `ShiftEntry` ON `User`.`UID` = `ShiftEntry`.`UID`
         LEFT JOIN `Shifts` ON `ShiftEntry`.`SID` = `Shifts`.`SID` 
@@ -37,8 +37,16 @@ function User_tshirt_score($user) {
         $user['UID'],
         time()
     ]);
+    $result_worklog = DB::selectOne('
+        SELECT SUM(`work_hours`) AS `tshirt_score`
+        FROM `User` 
+        LEFT JOIN `UserWorkLog` ON `User`.`UID` = `UserWorkLog`.`user_id`
+        WHERE `User`.`UID` = ?
+    ',[
+        $user['UID']
+    ]);
     
-    return $result['tshirt_score'];
+    return $result_shifts['tshirt_score'] + $result_worklog['tshirt_score'];
 }
 
 /**
diff --git a/includes/pages/admin_active.php b/includes/pages/admin_active.php
index 576cdc49..18553159 100644
--- a/includes/pages/admin_active.php
+++ b/includes/pages/admin_active.php
@@ -58,7 +58,9 @@ function admin_active()
                   SELECT
                       `User`.*,
                       COUNT(`ShiftEntry`.`id`) AS `shift_count`,
-                      %s AS `shift_length`
+                      (%s + (
+                          SELECT SUM(`work_hours`) * 3600 FROM `UserWorkLog` WHERE `user_id`=`User`.`UID`
+                      )) AS `shift_length`
                   FROM `User`
                   LEFT JOIN `ShiftEntry` ON `User`.`UID` = `ShiftEntry`.`UID`
                   LEFT JOIN `Shifts` ON `ShiftEntry`.`SID` = `Shifts`.`SID`
@@ -140,7 +142,9 @@ function admin_active()
             SELECT
                 `User`.*,
                 COUNT(`ShiftEntry`.`id`) AS `shift_count`,
-                %s AS `shift_length`
+                (%s + (
+                    SELECT SUM(`work_hours`) * 3600 FROM `UserWorkLog` WHERE `user_id`=`User`.`UID`
+                )) AS `shift_length`
             FROM `User` LEFT JOIN `ShiftEntry` ON `User`.`UID` = `ShiftEntry`.`UID`
             LEFT JOIN `Shifts` ON `ShiftEntry`.`SID` = `Shifts`.`SID` '
         . ($show_all_shifts ? '' : 'AND (`Shifts`.`end` < ' . time() . " OR `Shifts`.`end` IS NULL)") . '
diff --git a/includes/view/UserWorkLog_view.php b/includes/view/UserWorkLog_view.php
new file mode 100644
index 00000000..86a367ae
--- /dev/null
+++ b/includes/view/UserWorkLog_view.php
@@ -0,0 +1,95 @@
+<?php
+
+/**
+ * Delete work log entry.
+ * @param User $user_source
+ * @param UserWorkLog $userWorkLog
+ */
+function UserWorkLog_delete_view($user_source, $userWorkLog)
+{
+    return page_with_title(UserWorkLog_delete_title(), [
+        info(sprintf(_('Do you want to delete the worklog entry for %s?'), User_Nick_render($user_source)), true),
+        buttons([
+            button(user_link($user_source), glyph('remove') . _('cancel')),
+            button(user_worklog_delete_link($userWorkLog, [
+                'confirmed' => 1
+            ]), glyph('ok') . _('delete'), 'btn-danger')
+        ])
+    ]);
+}
+
+/**
+ * Title for work log delete.
+ */
+function UserWorkLog_delete_title()
+{
+    return _('Delete work log entry');
+}
+
+/**
+ * Render edit table.
+ * 
+ * @param User $user_source            
+ * @param UserWorkLog $userWorkLog            
+ */
+function UserWorkLog_edit_form($user_source, $userWorkLog)
+{
+    return form([
+        form_info(_('User'), User_Nick_render($user_source)),
+        form_text('work_hours', _('Work hours'), $userWorkLog['work_hours']),
+        form_text('comment', _('Comment'), $userWorkLog['comment']),
+        form_submit('submit', _('Add'))
+    ]);
+}
+
+/**
+ * Form for edit a user work log entry.
+ *
+ * @param User $user_source            
+ * @param UserWorkLog $userWorkLog            
+ */
+function UserWorkLog_edit_view($user_source, $userWorkLog)
+{
+    return page_with_title(UserWorkLog_edit_title(), [
+        buttons([
+            button(user_link($user_source), _('back'))
+        ]),
+        msg(),
+        UserWorkLog_edit_form($user_source, $userWorkLog)
+    ]);
+}
+
+/**
+ * Form for adding a user work log entry.
+ *
+ * @param User $user_source            
+ * @param UserWorkLog $userWorkLog            
+ */
+function UserWorkLog_add_view($user_source, $userWorkLog)
+{
+    return page_with_title(UserWorkLog_add_title(), [
+        buttons([
+            button(user_link($user_source), _('back'))
+        ]),
+        msg(),
+        UserWorkLog_edit_form($user_source, $userWorkLog)
+    ]);
+}
+
+/**
+ * Title text for editing work log entry.
+ */
+function UserWorkLog_edit_title()
+{
+    return _('Edit work log entry');
+}
+
+/**
+ * Title text for adding work log entry.
+ */
+function UserWorkLog_add_title()
+{
+    return _('Add work log entry');
+}
+
+?>
\ No newline at end of file
diff --git a/includes/view/User_view.php b/includes/view/User_view.php
index fff2952e..b1521ff8 100644
--- a/includes/view/User_view.php
+++ b/includes/view/User_view.php
@@ -408,7 +408,7 @@ function User_view_myshift($shift, $user_source, $its_me)
  * @param bool    $its_me
  * @return array
  */
-function User_view_myshifts($shifts, $user_source, $its_me, $tshirt_score, $tshirt_admin)
+function User_view_myshifts($shifts, $user_source, $its_me, $tshirt_score, $tshirt_admin, $user_worklogs, $admin_user_worklog_privilege)
 {
     $myshifts_table = [];
     $timesum = 0;
@@ -420,6 +420,13 @@ function User_view_myshifts($shifts, $user_source, $its_me, $tshirt_score, $tshi
         }
     }
 
+    if($its_me || $admin_user_worklog_privilege) {
+        foreach($user_worklogs as $worklog) {
+            $myshifts_table[] = User_view_worklog($worklog, $admin_user_worklog_privilege);
+            $timesum += $worklog['work_hours'] * 3600;
+        }
+    }
+
     if (count($myshifts_table) > 0) {
         $myshifts_table[] = [
             'date'       => '<b>' . _('Sum:') . '</b>',
@@ -443,6 +450,38 @@ function User_view_myshifts($shifts, $user_source, $its_me, $tshirt_score, $tshi
     return $myshifts_table;
 }
 
+/**
+ * Renders table entry for user work log
+ * @param UserWorkLog $worklog
+ * @param bool $admin_user_worklog_privilege
+ */
+function User_view_worklog($worklog, $admin_user_worklog_privilege) {
+    $actions = '';
+    if($admin_user_worklog_privilege) {
+        $actions = table_buttons([
+            button(
+                user_worklog_edit_link($worklog),
+                glyph('edit') . _('edit'),
+                'btn-xs'
+            ),
+            button(
+                user_worklog_delete_link($worklog),
+                glyph('trash') . _('delete'),
+                'btn-xs'
+            )
+        ]);
+    }
+    
+    return [
+        'date'       => '',
+        'duration'   => '<b>' . $worklog['work_hours'] . ' h</b>',
+        'room'       => '',
+        'shift_info' => _('Work log entry'),
+        'comment'    => $worklog['comment'],
+        'actions'    => $actions
+    ];
+}
+
 /**
  * Renders view for a single user
  *
@@ -466,12 +505,14 @@ function User_view(
     $shifts,
     $its_me,
     $tshirt_score,
-    $tshirt_admin
+    $tshirt_admin,
+    $admin_user_worklog_privilege,
+    $user_worklogs
 ) {
     $user_name = htmlspecialchars($user_source['Vorname']) . ' ' . htmlspecialchars($user_source['Name']);
     $myshifts_table = '';
     if($its_me || $admin_user_privilege) {
-        $my_shifts = User_view_myshifts($shifts, $user_source, $its_me, $tshirt_score, $tshirt_admin);
+        $my_shifts = User_view_myshifts($shifts, $user_source, $its_me, $tshirt_score, $tshirt_admin, $user_worklogs, $admin_user_worklog_privilege);
         if(count($my_shifts) > 0) {
             $myshifts_table = table([
                 'date'       => _('Day &amp; time'),
@@ -514,6 +555,10 @@ function User_view(
                             ),
                             glyph('cutlery') . _('Edit vouchers')
                         ) : '',
+                        $admin_user_worklog_privilege ? button(
+                            user_worklog_add_link($user_source),
+                            glyph('list') . _('Add work log')
+                        ) : '',
                         $its_me ? button(
                             page_link_to('user_settings'),
                             glyph('list-alt') . _('Settings')
diff --git a/public/index.php b/public/index.php
index af7318b1..adf22e71 100644
--- a/public/index.php
+++ b/public/index.php
@@ -22,6 +22,7 @@ $free_pages = [
     'users',
     'user_driver_licenses',
     'user_password_recovery',
+    'user_worklog'
 ];
 
 // Gewünschte Seite/Funktion
@@ -130,6 +131,9 @@ if (
             $title = shifts_title();
             $content = user_shifts();
             break;
+        case 'user_worklog':
+            list($title, $content) = user_worklogs_controller();
+            break;
         case 'user_messages':
             $title = messages_title();
             $content = user_messages();