* Add expiration timestamp to cert_expiry sensors
* Clear timestamp if cert becomes invalid
* Use timezone-aware timestamps
* Use DataUpdateCoordinator, split timestamp to separate sensor
* Use UTC, simpler add/remove handling
* Review fixes
* Fix incomplete mock that fails in 3.8
* Use static timestamps, improve helper method name
* Fix typo in translations
* Work on bug #26619
* readd the homeassistant.start event
* Remove the callback
* Added the executor_job for _test_connection
* Update test_config_flow.py
* Enable cert_expiry config entries
* add black
* lint fixes
* Rerun black
* Black on json files is a bad idea
* Work on comments
* Forgot the lint
* More comment work
* Correctly set defaults
* More comments
* Add codeowner
* Fix black
* More comments implemented
* Removed the catch
* Add helper.py from cert_expiry to .coveragerc