Correct timestamp on alert for terminal mode

docker-compose/Dockerfile

@@ -1,3 +1,3 @@
-FROM nicolargo/glances:latest as glancesminimal
+FROM glances:local-alpine-minimal as glancesminimal
 COPY glances.conf /glances/conf/glances.conf
 CMD python -m glances -C /glances/conf/glances.conf $GLANCES_OPT

glances/plugins/alert/__init__.py

@@ -10,6 +10,8 @@
 """Alert plugin."""
 
 from datetime import datetime
+from time import tzname
+import pytz
 
 from glances.logger import logger
 from glances.events import glances_events
@@ -211,8 +213,8 @@ class PluginModel(GlancesPluginModel):
             # New line
             ret.append(self.curse_new_line())
             # Start
-            # TODO: Related to #2591, manege TZ in order to make it work inside containers
-            msg = str(datetime.fromtimestamp(alert[0]))
+            msg = str(datetime.fromtimestamp(alert[0],
+                                             tz=pytz.timezone(tzname[0] if tzname[0] else 'UTC')))
             ret.append(self.curse_add_line(msg))
             # Duration
             if alert[1] > 0:

requirements.txt

@@ -4,3 +4,4 @@ packaging
 ujson<4; python_version >= "3.5" and python_version < "3.6"
 ujson<5; python_version >= "3.6" and python_version < "3.7"
 ujson>=5.4.0; python_version >= "3.7"
+pytz