diff --git a/backend/cronRouter.php b/backend/cronRouter.php
index eb2f1b3..a13e1f7 100644
--- a/backend/cronRouter.php
+++ b/backend/cronRouter.php
@@ -114,6 +114,11 @@ function job_schedule_availability() {
                     $schedule["minutes"] <= $now["minutes"] &&
                     $now["minutes"] - $schedule["minutes"] <= 30
                 ){
+                    $availability_last_change = $db->select("SELECT availability_last_change FROM `".DB_PREFIX."_profiles` WHERE `id` = ?", [$user_id]);
+                    if($availability_last_change === "manual" && $last_exec["day"] === $now["day"]){
+                        break;
+                    }
+
                     if(!in_array($user_id,$schedules_users)) $schedules_users[] = $user_id;
                     if(is_null($last_exec) || (is_array($last_exec) && $schedule["hour"] == $last_exec["hour"] ? $schedule["minutes"] !== $last_exec["minutes"] : true)/* && !in_array(date('Y-m-d'), $selected_holidays_dates)*/){
                         $last_exec_new = $schedule["day"].";".sprintf("%02d", $schedule["hour"]).":".sprintf("%02d", $schedule["minutes"]);
diff --git a/frontend/.gitignore b/frontend/.gitignore
index 105c00f..baf7fdf 100644
--- a/frontend/.gitignore
+++ b/frontend/.gitignore
@@ -44,3 +44,5 @@ testem.log
 # System Files
 .DS_Store
 Thumbs.db
+
+src/environments/versions.ts
diff --git a/frontend/git.version.js b/frontend/git.version.js
new file mode 100644
index 0000000..fa9cbde
--- /dev/null
+++ b/frontend/git.version.js
@@ -0,0 +1,28 @@
+//based on https://stackoverflow.com/a/42199863
+
+const { writeFileSync } = require('fs');
+const { promisify } = require('util');
+const { exec } = require('child_process');
+const exec_promise = promisify(exec);
+
+async function createVersionsFile(filename) {
+  const revision = (await exec_promise('git rev-parse --short HEAD')).stdout.toString().trim();
+  const revision_timestamp = parseInt((await exec_promise('git log -1 --format="%at"')).stdout.toString().trim())*1000;
+  const branch = (await exec_promise('git rev-parse --abbrev-ref HEAD')).stdout.toString().trim();
+  const remote_url = (await exec_promise('git config --get remote.origin.url')).stdout.toString().trim();
+
+  console.log(`revision: '${revision}', revision_timestamp: '${revision_timestamp}', branch: '${branch}', remote_url: '${remote_url}'`);
+
+  const content = 
+`// this file is automatically generated by git.version.js script
+export const versions = {
+  revision: '${revision}',
+  revision_timestamp: ${revision_timestamp},
+  branch: '${branch}',
+  remote_url: '${remote_url}'
+};`;
+
+  writeFileSync(filename, content, {encoding: 'utf8'});
+}
+
+createVersionsFile('src/environments/versions.ts');
\ No newline at end of file
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index d34067f..128a5d1 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -33,7 +33,7 @@
         "@angular/compiler-cli": "~13.0.0",
         "@types/jasmine": "~3.10.0",
         "@types/node": "16.11.17",
-        "jasmine-core": "~3.10.0",
+        "jasmine-core": "4.0.0",
         "karma": "~6.3.0",
         "karma-chrome-launcher": "~3.1.0",
         "karma-coverage": "~2.0.3",
@@ -6792,9 +6792,9 @@
       }
     },
     "node_modules/jasmine-core": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/jasmine-core/-/jasmine-core-3.10.1.tgz",
-      "integrity": "sha512-ooZWSDVAdh79Rrj4/nnfklL3NQVra0BcuhcuWoAwwi+znLDoUeH87AFfeX8s+YeYi6xlv5nveRyaA1v7CintfA==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jasmine-core/-/jasmine-core-4.0.0.tgz",
+      "integrity": "sha512-tq24OCqHElgU9KDpb/8O21r1IfotgjIzalfW9eCmRR40LZpvwXT68iariIyayMwi0m98RDt16aljdbwK0sBMmQ==",
       "dev": true
     },
     "node_modules/jest-worker": {
@@ -7038,6 +7038,12 @@
         "karma-jasmine": ">=1.1"
       }
     },
+    "node_modules/karma-jasmine/node_modules/jasmine-core": {
+      "version": "3.99.0",
+      "resolved": "https://registry.npmjs.org/jasmine-core/-/jasmine-core-3.99.0.tgz",
+      "integrity": "sha512-+ZDaJlEfRopINQqgE+hvzRyDIQDeKfqqTvF8RzXsvU1yE3pBDRud2+Qfh9WvGgRpuzqxyQJVI6Amy5XQ11r/3w==",
+      "dev": true
+    },
     "node_modules/karma-source-map-support": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/karma-source-map-support/-/karma-source-map-support-1.4.0.tgz",
@@ -17570,9 +17576,9 @@
       }
     },
     "jasmine-core": {
-      "version": "3.10.1",
-      "resolved": "https://registry.npmjs.org/jasmine-core/-/jasmine-core-3.10.1.tgz",
-      "integrity": "sha512-ooZWSDVAdh79Rrj4/nnfklL3NQVra0BcuhcuWoAwwi+znLDoUeH87AFfeX8s+YeYi6xlv5nveRyaA1v7CintfA==",
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/jasmine-core/-/jasmine-core-4.0.0.tgz",
+      "integrity": "sha512-tq24OCqHElgU9KDpb/8O21r1IfotgjIzalfW9eCmRR40LZpvwXT68iariIyayMwi0m98RDt16aljdbwK0sBMmQ==",
       "dev": true
     },
     "jest-worker": {
@@ -17794,6 +17800,14 @@
       "dev": true,
       "requires": {
         "jasmine-core": "^3.6.0"
+      },
+      "dependencies": {
+        "jasmine-core": {
+          "version": "3.99.0",
+          "resolved": "https://registry.npmjs.org/jasmine-core/-/jasmine-core-3.99.0.tgz",
+          "integrity": "sha512-+ZDaJlEfRopINQqgE+hvzRyDIQDeKfqqTvF8RzXsvU1yE3pBDRud2+Qfh9WvGgRpuzqxyQJVI6Amy5XQ11r/3w==",
+          "dev": true
+        }
       }
     },
     "karma-jasmine-html-reporter": {
diff --git a/frontend/package.json b/frontend/package.json
index e045320..c3d0ec0 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -2,6 +2,8 @@
   "name": "allerta-vvf",
   "version": "0.0.0",
   "scripts": {
+    "prestart": "node git.version.js",
+    "prebuild": "node git.version.js",
     "ng": "ng",
     "start": "ng serve",
     "build": "ng build --base-href=./",
@@ -35,7 +37,7 @@
     "@angular/compiler-cli": "~13.0.0",
     "@types/jasmine": "~3.10.0",
     "@types/node": "16.11.17",
-    "jasmine-core": "~3.10.0",
+    "jasmine-core": "4.0.0",
     "karma": "~6.3.0",
     "karma-chrome-launcher": "~3.1.0",
     "karma-coverage": "~2.0.3",
diff --git a/frontend/src/app/app.component.html b/frontend/src/app/app.component.html
index 1bdd2fe..b425710 100644
--- a/frontend/src/app/app.component.html
+++ b/frontend/src/app/app.component.html
@@ -7,4 +7,9 @@
   <a class="icon" id="menuButton" (click)="menuButtonClicked = !menuButtonClicked">☰</a>
 </div>
 
-<router-outlet></router-outlet>
\ No newline at end of file
+<router-outlet></router-outlet>
+
+<div id="footer" class="footer text-center p-3">
+  Allerta-VVF, software libero realizzato per i Vigili del Fuoco volontari.<br>
+  <p>Revisione {{ versions.revision }} ({{ revision_datetime_string }})</p>
+</div>
diff --git a/frontend/src/app/app.component.scss b/frontend/src/app/app.component.scss
index 755653d..5d514a1 100644
--- a/frontend/src/app/app.component.scss
+++ b/frontend/src/app/app.component.scss
@@ -63,3 +63,14 @@
     text-align: left;
   }
 }
+
+.footer {
+  background-color: rgba(0, 0, 0, 0.2);
+  font-style: italic;
+  margin-top: 2em;
+  margin-bottom: 0;
+}
+
+.footer > :last-child {
+  margin-bottom: 0;
+}
diff --git a/frontend/src/app/app.component.ts b/frontend/src/app/app.component.ts
index be55595..3d8c146 100644
--- a/frontend/src/app/app.component.ts
+++ b/frontend/src/app/app.component.ts
@@ -1,5 +1,6 @@
 import { Component } from '@angular/core';
 import { AuthService } from './_services/auth.service';
+import { versions } from 'src/environments/versions';
 
 @Component({
   selector: 'app-root',
@@ -8,6 +9,10 @@ import { AuthService } from './_services/auth.service';
 })
 export class AppComponent {
   public menuButtonClicked = false;
+  public revision_datetime_string;
+  public versions = versions;
 
-  constructor(public auth: AuthService) {}
+  constructor(public auth: AuthService) {
+    this.revision_datetime_string = new Date(versions.revision_timestamp).toLocaleString(undefined,  { day: '2-digit', month: '2-digit', year: 'numeric', hour: 'numeric', minute: 'numeric', second: 'numeric' });
+  }
 }