Time handling (#2901)

* Add new time handling

* migrate date for python3.9

* add timedate

* add tests & simplify it

* better testing

* use ssl

* use hostname with new interface

* expose to API

* update data

* add base handler

* new timezone handling

* improve handling

* Improve handling

* Add tests

* Time adjustment function

* Fix logging

* tweak condition

* don't adjust synchronized time

* Guard

* ignore UTC

* small cleanup

* like that, we can leaf it

* add URL

* add comment

* Apply suggestions from code review

Co-authored-by: Joakim Sørensen <joasoe@gmail.com>

Co-authored-by: Joakim Sørensen <joasoe@gmail.com>

tests/test_coresys.py

@@ -0,0 +1,17 @@
+"""Testing handling with CoreState."""
+
+from supervisor.coresys import CoreSys
+
+
+async def test_timezone(run_dir, coresys: CoreSys):
+    """Test write corestate to /run/supervisor."""
+
+    assert coresys.timezone == "UTC"
+    assert coresys.config.timezone is None
+
+    await coresys.dbus.timedate.connect()
+    await coresys.dbus.timedate.update()
+    assert coresys.timezone == "Etc/UTC"
+
+    coresys.config.timezone = "Europe/Zurich"
+    assert coresys.timezone == "Europe/Zurich"