Notification Sensor: wrong timezone information

[ronmichel]

There seems to be a bug in the sensor code. The sensor data is from the "date_time" key with no time zone information. If HA is in another timezone than the Echo device it will get mixed up. In any case the +x hours in the sensor state ist confusing.
The sensor should used the "alarmTime" key for the unix timestamp and just convert it for the sensor state with timestamp_local.

[alandtse]

The issue is alarmTime is only populated sometimes for alarms. We can change it so it uses alarmTime when it's available but still won't resolve all cases.

date_time is taking the originalDate and originalTime fields that are always there for alarms but yes they don't give timestamp info. In theory we should grab the local timezone of the echo and then populate that data but that will take another API call to figure out, assuming it's available. I think I tried to find it but it didn't exist and would have to be computed from the location.

The +x hours is the format HA actually expects per the design docs which require ISO8601.

[alandtse]

Please test.