Add input_datetime to MQTT SubEntries

[tbouron]

Integration name

MQTT

Link to integration documentation on our website

https://rc.home-assistant.io/integrations/mqtt

Describe the enhancement

Currently, only a subset of of conponents are available via SubEntries. In a world where we all would like to avoid touching configuration file, it would be great to be able to create an input_datetime – supporting both date, datetime and time mode – via SubEntries

Use cases

Somes devices expose schedule feature, like a sprinkler system or a pool pump. Usually, you have a start and end time. We can already create a basic text sensor but that doesn't take a command topic, nor all the niceties to set the date and/or time through the UI.

Having this would unlock the possibilty of seeing the state and control it, with native HA UI.

Anything else?

There is a similar – unasnwered – request for MQTT discovery: https://github.com/orgs/home-assistant/discussions/2348

[github-actions[bot]]

🏷️ I've automatically added the integration: mqtt label to help categorize this feature request.

[Petro31]

MQTT would not implement innput_datetimes, they would implement datetime's. FYI. input_datetime is a helper that's only user generated where datetimes are the integration generated counter-parts to input_datetimes.

[jbouwh]

We have a new datetime platform. It is not possible to add this as a subentry yet, but you can configure it via YAMLor discovery.

[jbouwh]

Release 2026.6 will have this support