Datetime: add state (#34686)

source/_integrations/datetime.markdown

@@ -17,6 +17,15 @@ The **Date/Time** {% term integration %} is built for the controlling and monito
 
 If you are looking for a way to create a Date/Time entity, please take a look at the [Date/Time helper](/integrations/input_datetime).
 
+## The state of a date/time entity
+
+The state of a date/time entity is the actual date and time value.
+
+<p class='img'>
+<img src='/images/integrations/datetime/state_datetime.png' alt='Screenshot showing the state of a date/time entity in the developer tools' />
+Screenshot showing the state of a date/time entity in the developer tools. In the example shown, the state is January 1, 2020 at 12:00 in the format YYYY-MM-DD T HH:MM:SS.
+</p>
+
 ## Actions
 
 ### datetime actions
@@ -28,6 +37,6 @@ Available {% term actions %}: `datetime.set_value`
 Set a new value for the datetime {% term entity %}.
 
 | Data attribute | Optional | Description                                                                                                  |
-| ---------------------- | -------- | ------------------------------------------------------------------------------------------------------------ |
-| `entity_id`            | no       | String or list of strings that point at `entity_id`'s of datetimes to control.                               |
-| `datetime`             | no       | New datetime value to set. If timezone is not included, the Home Assistant instance's timezone will be used. |
+| -------------- | -------- | ------------------------------------------------------------------------------------------------------------ |
+| `entity_id`    | no       | String or list of strings that point at `entity_id`'s of datetimes to control.                               |
+| `datetime`     | no       | New datetime value to set. If timezone is not included, the Home Assistant instance's timezone will be used. |