diff --git a/ui/package-lock.json b/ui/package-lock.json
index 3ce834a..2c160ee 100644
--- a/ui/package-lock.json
+++ b/ui/package-lock.json
@@ -8,6 +8,7 @@
       "name": "atsebayt",
       "version": "0.0.1",
       "dependencies": {
+        "dayjs": "^1.11.5",
         "svelte-frappe-charts": "^1.9.1",
         "vite": "^3.0.4"
       },
@@ -645,6 +646,11 @@
         "node": ">= 8"
       }
     },
+    "node_modules/dayjs": {
+      "version": "1.11.5",
+      "resolved": "https://registry.npmjs.org/dayjs/-/dayjs-1.11.5.tgz",
+      "integrity": "sha512-CAdX5Q3YW3Gclyo5Vpqkgpj8fSdLQcRuzfX6mC6Phy0nfJ0eGYOeS7m4mt2plDWLAtA4TqTakvbboHvUxfe4iA=="
+    },
     "node_modules/debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
@@ -3091,6 +3097,11 @@
         "which": "^2.0.1"
       }
     },
+    "dayjs": {
+      "version": "1.11.5",
+      "resolved": "https://registry.npmjs.org/dayjs/-/dayjs-1.11.5.tgz",
+      "integrity": "sha512-CAdX5Q3YW3Gclyo5Vpqkgpj8fSdLQcRuzfX6mC6Phy0nfJ0eGYOeS7m4mt2plDWLAtA4TqTakvbboHvUxfe4iA=="
+    },
     "debug": {
       "version": "4.3.4",
       "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
diff --git a/ui/package.json b/ui/package.json
index 76e67f4..dc0668f 100644
--- a/ui/package.json
+++ b/ui/package.json
@@ -28,6 +28,7 @@
   },
   "type": "module",
   "dependencies": {
+    "dayjs": "^1.11.5",
     "svelte-frappe-charts": "^1.9.1",
     "vite": "^3.0.4"
   }
diff --git a/ui/src/components/DateTimeInput.svelte b/ui/src/components/DateTimeInput.svelte
new file mode 100644
index 0000000..d39ff70
--- /dev/null
+++ b/ui/src/components/DateTimeInput.svelte
@@ -0,0 +1,21 @@
+<script>
+ import dayjs from 'dayjs';
+
+ export let format = 'YYYY-MM-DD HH:mm';
+ export let date = new Date();
+
+ let className = '';
+ export { className as class };
+
+ export let id = null;
+
+ let internal;
+
+ const input = (x) => (internal = dayjs(x).format(format));
+ const output = (x) => (date = dayjs(x, format).toDate().toISOString());
+
+ $: input(date)
+ $: output(internal)
+</script>
+
+<input type="datetime-local" class={className} id={id} bind:value={internal}>
diff --git a/ui/src/components/SubmissionStatus.svelte b/ui/src/components/SubmissionStatus.svelte
index 5a2b1d4..b7ad14a 100644
--- a/ui/src/components/SubmissionStatus.svelte
+++ b/ui/src/components/SubmissionStatus.svelte
@@ -1,4 +1,6 @@
 <script>
+ import { createEventDispatcher } from 'svelte';
+
  import DateFormat from '../components/DateFormat.svelte';
  import { getUserRendu } from '../lib/works';
 
@@ -7,12 +9,32 @@
 
  export let work = null;
  export let user = null;
+
+ const dispatch = createEventDispatcher();
+ let renduP = null;
+ let submissionP = null;
+
+ if (work.submission_url != '-') {
+     if (work.submission_url) {
+         renduP = getUserRendu(work.submission_url, user);
+         renduP.then((rendu) => {
+             if (rendu !== null) {
+                 dispatch('done');
+             }
+         })
+     } else {
+         submissionP = work.getSubmission(user.id);
+         submissionP.then((submission) => {
+             dispatch('done');
+         })
+     }
+ }
 </script>
 
 {#if work.submission_url == '-'}
     <!-- Display nothing -->
 {:else if work.submission_url}
-    {#await getUserRendu(work.submission_url, user)}
+    {#await renduP}
         <div class="spinner-border spinner-border-sm" role="status"></div>
     {:then rendu}
         {#if rendu === null}
@@ -24,7 +46,7 @@
         <i class="bi text-warning bi-exclamation-triangle-fill" title={error}></i>
     {/await}
 {:else}
-    {#await work.getSubmission(user.id)}
+    {#await submissionP}
         <div class="spinner-border spinner-border-sm" role="status"></div>
     {:then submission}
         <i class="bi text-success bi-check-circle-fill" title={"Rendu effectué : " + JSON.stringify(submission)}></i>
diff --git a/ui/src/components/SurveyAdmin.svelte b/ui/src/components/SurveyAdmin.svelte
index 07b1455..865e6a3 100644
--- a/ui/src/components/SurveyAdmin.svelte
+++ b/ui/src/components/SurveyAdmin.svelte
@@ -3,6 +3,7 @@
  import { goto } from '$app/navigation';
 
  import { getQuestions } from '../lib/questions';
+ import DateTimeInput from './DateTimeInput.svelte';
  import { ToastsStore } from '../stores/toasts';
 
  const dispatch = createEventDispatcher();
@@ -13,17 +14,21 @@
          dispatch('saved', response);
      }, (error) => {
          ToastsStore.addErrorToast({
-             msg: error.errmsg,
+             msg: error,
          });
      })
  }
 
+ let deleteInProgress = false;
  function deleteSurvey() {
+     deleteInProgress = true;
      survey.delete().then((response) => {
+         deleteInProgress = false;
          goto(`surveys`);
      }, (error) => {
+         deleteInProgress = false;
          ToastsStore.addErrorToast({
-             msg: error.errmsg,
+             msg: error,
          });
      })
  }
@@ -33,7 +38,7 @@
          goto(`surveys/${response.id}`);
      }).catch((error) => {
          ToastsStore.addErrorToast({
-             msg: error.errmsg,
+             msg: error,
          });
      })
  }
@@ -104,7 +109,7 @@
             <label for="start_availability" class="col-form-label col-form-label-sm">Date de début</label>
         </div>
         <div class="col-sm-8">
-            <input type="text" class="form-control form-control-sm" id="start_availability" bind:value={survey.start_availability}>
+            <DateTimeInput class="form-control form-control-sm" id="start_availability" bind:date={survey.start_availability} />
         </div>
     </div>
 
@@ -113,7 +118,7 @@
             <label for="end_availability" class="col-form-label col-form-label-sm">Date de fin</label>
         </div>
         <div class="col-8">
-            <input type="text" class="form-control form-control-sm" id="end_availability" bind:value={survey.end_availability}>
+            <DateTimeInput class="form-control form-control-sm" id="end_availability" bind:date={survey.end_availability} />
         </div>
     </div>
 
@@ -137,7 +142,12 @@
         <div class="col-sm-10">
             <button type="submit" class="btn btn-primary">Enregistrer</button>
             {#if survey.id}
-                <button type="button" class="btn btn-danger" on:click={deleteSurvey}>Supprimer</button>
+                <button type="button" class="btn btn-danger" on:click={deleteSurvey} disabled={deleteInProgress}>
+                    {#if deleteInProgress}
+                        <div class="spinner-border spinner-border-sm text-light me-1" role="status"></div>
+                    {/if}
+                    Supprimer
+                </button>
                 <button type="button" class="btn btn-secondary" on:click={duplicateSurvey}>Dupliquer avec ces nouveaux paramètres</button>
             {/if}
         </div>
diff --git a/ui/src/components/WorkAdmin.svelte b/ui/src/components/WorkAdmin.svelte
index b9e7c55..8660e1d 100644
--- a/ui/src/components/WorkAdmin.svelte
+++ b/ui/src/components/WorkAdmin.svelte
@@ -2,6 +2,7 @@
  import { createEventDispatcher } from 'svelte';
  import { goto } from '$app/navigation';
 
+ import DateTimeInput from './DateTimeInput.svelte';
  import { ToastsStore } from '../stores/toasts';
 
  const dispatch = createEventDispatcher();
@@ -12,7 +13,7 @@
          dispatch('saved', response);
      }, (error) => {
          ToastsStore.addErrorToast({
-             msg: error.errmsg,
+             msg: error,
          });
      })
  }
@@ -22,7 +23,7 @@
          goto(`works`);
      }, (error) => {
          ToastsStore.addErrorToast({
-             msg: error.errmsg,
+             msg: error,
          });
      })
  }
@@ -32,7 +33,7 @@
          goto(`works/${response.id}`);
      }).catch((error) => {
          ToastsStore.addErrorToast({
-             msg: error.errmsg,
+             msg: error,
          });
      })
  }
@@ -102,7 +103,7 @@
             <label for="start_availability" class="col-form-label col-form-label-sm">Date de début</label>
         </div>
         <div class="col-sm-8">
-            <input type="text" class="form-control form-control-sm" id="start_availability" bind:value={work.start_availability}>
+            <DateTimeInput class="form-control form-control-sm" id="start_availability" bind:date={work.start_availability} />
         </div>
     </div>
 
@@ -111,7 +112,7 @@
             <label for="end_availability" class="col-form-label col-form-label-sm">Date de fin</label>
         </div>
         <div class="col-8">
-            <input type="text" class="form-control form-control-sm" id="end_availability" bind:value={work.end_availability}>
+            <DateTimeInput class="form-control form-control-sm" id="end_availability" bind:date={work.end_availability} />
         </div>
     </div>
 
diff --git a/ui/src/lib/questions.js b/ui/src/lib/questions.js
index bb81ab0..53e2115 100644
--- a/ui/src/lib/questions.js
+++ b/ui/src/lib/questions.js
@@ -120,6 +120,12 @@ export class Question {
 
   async delete() {
     if (this.id) {
+      // Start by deleting proposals
+      const proposals = await this.getProposals();
+      for (const p of proposals) {
+        await p.delete();
+      }
+
       const res = await fetch(`api/questions/${this.id}`, {
         method: 'DELETE',
         headers: {'Accept': 'application/json'},
diff --git a/ui/src/lib/surveys.js b/ui/src/lib/surveys.js
index b3904d3..9e1e69f 100644
--- a/ui/src/lib/surveys.js
+++ b/ui/src/lib/surveys.js
@@ -1,3 +1,4 @@
+import { getCorrectionTemplates } from './correctionTemplates';
 import { getQuestions } from './questions';
 import { Response } from './response';
 import { Work } from './works';
@@ -101,9 +102,33 @@ export class Survey {
         // Now recopy questions
         const questions = await getQuestions(oldSurveyId);
         for (const q of questions) {
+          const oldQuestionId = q.id;
+
           delete q.id;
           q.id_survey = response.id;
-          q.save();
+          q.save().then((question) => {
+            q.id = oldQuestionId;
+
+            // Now recopy proposals
+            if (q.kind == "mcq" || q.kind == "ucq") {
+              q.getProposals().then((proposals) => {
+                for (const p of proposals) {
+                  delete p.id;
+                  p.id_question = question.id;
+                  p.save();
+                }
+              });
+            }
+
+            // Now recopy correction templates
+            getCorrectionTemplates(oldQuestionId).then((cts) => {
+              for (const ct of cts) {
+                delete ct.id;
+                ct.id_question = question.id;
+                ct.save();
+              }
+            });
+          });
         }
 
         return response;
@@ -115,6 +140,12 @@ export class Survey {
 
   async delete() {
     if (this.id) {
+      // Start by deleting questions
+      const questions = await getQuestions(this.id);
+      for (const q of questions) {
+        await q.delete();
+      }
+
       const res = await fetch(`api/surveys/${this.id}`, {
         method: 'DELETE',
         headers: {'Accept': 'application/json'},
diff --git a/ui/src/routes/surveys/[sid]/responses/index.svelte b/ui/src/routes/surveys/[sid]/responses/index.svelte
index f90105f..6414f38 100644
--- a/ui/src/routes/surveys/[sid]/responses/index.svelte
+++ b/ui/src/routes/surveys/[sid]/responses/index.svelte
@@ -13,20 +13,26 @@
 <script lang="ts">
  import { goto } from '$app/navigation';
 
+ import { user } from '../../../../stores/user';
  import StartStopLiveSurvey from '../../../../components/StartStopLiveSurvey.svelte';
+ import SurveyAdmin from '../../../../components/SurveyAdmin.svelte';
  import SurveyBadge from '../../../../components/SurveyBadge.svelte';
  import SurveyQuestions from '../../../../components/SurveyQuestions.svelte';
  import { getQuestions } from '../../../../lib/questions';
 
  export let surveyP;
+ let edit = false;
 </script>
 
 {#await surveyP then survey}
-    <StartStopLiveSurvey
-        {survey}
-        class="ms-1 float-end"
-        on:update={() => goto(`surveys/${survey.id}/admin`)}
-    />
+    {#if $user && $user.is_admin}
+        <button class="btn btn-primary ms-1 float-end" on:click={() => { edit = !edit; } } title="Éditer"><i class="bi bi-pencil"></i></button>
+        <StartStopLiveSurvey
+            {survey}
+            class="ms-1 float-end"
+            on:update={() => goto(`surveys/${survey.id}/admin`)}
+        />
+    {/if}
     <div class="d-flex align-items-center">
         <h2>
             <a href="surveys/{survey.id}" class="text-muted" style="text-decoration: none">&lt;</a>
@@ -36,6 +42,10 @@
         <SurveyBadge class="ms-2" {survey} />
     </div>
 
+    {#if $user && $user.is_admin && edit}
+        <SurveyAdmin {survey} on:saved={() => edit = false} />
+    {/if}
+
     {#await getQuestions(survey.id)}
         <div class="text-center">
             <div class="spinner-border text-primary mx-3" role="status"></div>
diff --git a/ui/src/routes/works/[wid]/rendus.svelte b/ui/src/routes/works/[wid]/rendus.svelte
index 2511e44..55ebb28 100644
--- a/ui/src/routes/works/[wid]/rendus.svelte
+++ b/ui/src/routes/works/[wid]/rendus.svelte
@@ -22,6 +22,14 @@
  import { getUsers } from '../../../lib/users';
 
  export let work = null;
+ let usersP = null;
+ work.then((w) => {
+     usersP = getUsers(w.promo, w.group);
+     usersP.then((users) => { nb_users = users.length; });
+ });
+
+ let nb_rendus = 0;
+ let nb_users = 0;
 </script>
 
 {#await work then w}
@@ -29,12 +37,12 @@
         <h2>
             <a href="works/{w.id}" class="text-muted" style="text-decoration: none">&lt;</a>
             {w.title}
+            <small class="text-muted">Rendus {Math.trunc(nb_rendus/nb_users*100)}&nbsp;% ({nb_rendus}/{nb_users})</small>
         </h2>
         <SurveyBadge class="ms-2" survey={w} />
     </div>
 
-    {#await getUsers(w.promo, w.group)}
-    {:then users}
+    {#await usersP then users}
         <table class="w-100 mb-5">
             <thead>
                 <tr>
@@ -48,7 +56,7 @@
                     <tr>
                         <td><a href="users/{user.login}">{user.login}</a></td>
                         <td>
-                            <SubmissionStatus work={w} user={user} />
+                            <SubmissionStatus work={w} user={user} on:done={() => { nb_rendus += 1; user.show_dl_btn = true; }} />
                         </td>
                         <td>
                             {#await getRepositories(w.id, user.id) then repos}
@@ -82,6 +90,7 @@
                             <a
                                 href="/api/users/{user.id}/works/{w.id}/download"
                                 class="btn btn-sm btn-dark"
+                                class:disabled={!user.show_dl_btn}
                                 title="Télécharger la tarball du rendu"
                             >
                                 <i class="bi bi-download"></i>