diff --git a/sist2-admin/frontend/src/components/JobListItem.vue b/sist2-admin/frontend/src/components/JobListItem.vue
index d4e123b..3240f30 100644
--- a/sist2-admin/frontend/src/components/JobListItem.vue
+++ b/sist2-admin/frontend/src/components/JobListItem.vue
@@ -44,8 +44,7 @@ export default {
         return "";
       }
 
-      const date = Date.parse(dateString);
-      return moment(date).fromNow();
+      return moment.utc(dateString).local().fromNow();
     }
   }
 }
diff --git a/sist2-admin/frontend/src/views/Tasks.vue b/sist2-admin/frontend/src/views/Tasks.vue
index d051a2e..7fe92e8 100644
--- a/sist2-admin/frontend/src/views/Tasks.vue
+++ b/sist2-admin/frontend/src/views/Tasks.vue
@@ -121,7 +121,7 @@ export default {
           id: row.id,
           name: row.name,
           duration: this.taskDuration(row),
-          time: moment(row.started).format("dd, MMM Do YYYY, HH:mm:ss"),
+          time: moment.utc(row.started).local().format("dd, MMM Do YYYY, HH:mm:ss"),
           logs: row.id,
           status: row.return_code === 0 ? "ok" : "failed"
         }));
diff --git a/sist2-admin/sist2_admin/app.py b/sist2-admin/sist2_admin/app.py
index 360be0b..a63d460 100644
--- a/sist2-admin/sist2_admin/app.py
+++ b/sist2-admin/sist2_admin/app.py
@@ -80,9 +80,8 @@ async def get_jobs():
 
 @app.put("/api/job/{name:str}")
 async def update_job(name: str, new_job: Sist2Job):
-    # TODO: Check etag
 
-    new_job.last_modified = datetime.now()
+    new_job.last_modified = datetime.utcnow()
     job = db["jobs"][name]
     if not job:
         raise HTTPException(status_code=404)
@@ -135,7 +134,7 @@ async def kill_job(task_id: str):
 
 
 def _run_job(job: Sist2Job):
-    job.last_modified = datetime.now()
+    job.last_modified = datetime.utcnow()
     if job.status == JobStatus("created"):
         job.status = JobStatus("started")
     db["jobs"][job.name] = job
@@ -352,7 +351,7 @@ async def ws_tail_log(websocket: WebSocket, task_id: str, n: int):
 
 
 def main():
-    uvicorn.run(app, port=WEBSERVER_PORT, host="0.0.0.0")
+    uvicorn.run(app, port=WEBSERVER_PORT, host="0.0.0.0", timeout_graceful_shutdown=0)
 
 
 def initialize_db():
diff --git a/sist2-admin/sist2_admin/jobs.py b/sist2-admin/sist2_admin/jobs.py
index 639612e..09032b2 100644
--- a/sist2-admin/sist2_admin/jobs.py
+++ b/sist2-admin/sist2_admin/jobs.py
@@ -53,7 +53,7 @@ class Sist2Job(BaseModel):
             name=name,
             scan_options=ScanOptions(path="/"),
             index_options=IndexOptions(),
-            last_modified=datetime.now(),
+            last_modified=datetime.utcnow(),
             cron_expression="0 0 * * *"
         )
 
@@ -111,7 +111,7 @@ class Sist2Task:
             self._logger.info(json.dumps(log_json))
 
     def run(self, sist2: Sist2, db: PersistentState):
-        self.started = datetime.now()
+        self.started = datetime.utcnow()
 
         logger.info(f"Started task {self.display_name}")
 
@@ -132,14 +132,14 @@ class Sist2ScanTask(Sist2Task):
             self.pid = pid
 
         return_code = sist2.scan(self.job.scan_options, logs_cb=self.log_callback, set_pid_cb=set_pid)
-        self.ended = datetime.now()
+        self.ended = datetime.utcnow()
 
         if return_code != 0:
             self._logger.error(json.dumps({"sist2-admin": f"Process returned non-zero exit code ({return_code})"}))
             logger.info(f"Task {self.display_name} failed ({return_code})")
         else:
             self.job.index_path = self.job.scan_options.output
-            self.job.last_index_date = datetime.now()
+            self.job.last_index_date = datetime.utcnow()
             self.job.do_full_scan = False
             db["jobs"][self.job.name] = self.job
             self._logger.info(json.dumps({"sist2-admin": f"Save last_index_date={self.job.last_index_date}"}))
@@ -172,7 +172,7 @@ class Sist2IndexTask(Sist2Task):
         self.job.index_options.path = self.job.scan_options.output
 
         return_code = sist2.index(self.job.index_options, logs_cb=self.log_callback)
-        self.ended = datetime.now()
+        self.ended = datetime.utcnow()
 
         duration = self.ended - self.started
 
diff --git a/sist2-admin/sist2_admin/sist2.py b/sist2-admin/sist2_admin/sist2.py
index 7d55936..f1aec38 100644
--- a/sist2-admin/sist2_admin/sist2.py
+++ b/sist2-admin/sist2_admin/sist2.py
@@ -238,7 +238,7 @@ class Sist2:
         if options.output is None:
             options.output = os.path.join(
                 self._data_dir,
-                f"scan-{options.name.replace('/', '_')}-{datetime.now()}.sist2"
+                f"scan-{options.name.replace('/', '_')}-{datetime.utcnow()}.sist2"
             )
 
         args = [