Add support for last_changed / last_updated in start_time and improved duration calculation#233
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studiobts wants to merge 1 commit intorianadon:mainfrom
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…d calculation of duration with start_time and remain_time
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This PR introduces two new features:
Support for last_changed and last_updated properties
start_time can now be set to use the entity’s last_changed or last_updated directly.
Example:
Automatic duration calculation
When both start_time and remain_time are available, the card now computes the duration automatically.
The calculation has a margin of error of about one second due to approximation, but it is sufficient for most use cases.
Use case:
I manage several electric valves (switches) that expose only the remaining time before they close.
Thanks to this change, I no longer need to create helper entities. I can simply use the last_changed timestamp of the switch as the start_time, while relying on the existing remain_time attribute to infer the total duration.