thermopro: add set_datetime button for TP358/TP393 (#36987)

* thermopro: add set_datetime service for TP358/TP393

* Switch from service docu to button

* Follow CodeRabbit recommendations

* incorporate review comments

source/_integrations/thermopro.markdown

@@ -31,3 +31,31 @@ Integrates [ThermoPro](https://buythermopro.com/) devices into Home Assistant.
 The ThermoPro integration will automatically discover devices once the [Bluetooth](/integrations/bluetooth) integration is enabled and functional.
 
 {% include integrations/config_flow.md %}
+
+## Buttons
+
+These {% term actions %} allow one to set the time on supported devices (TP358, TP393) via Home Assistant.
+
+### Button `Set Date&Time`
+
+Sets the date & time on target devices to the system time in 24-hour notation.
+The device is capable of showing 12-hour notation (AM/PM) but setting this is currently not implemented.
+
+For example, the following automation sets the datetime of the thermometer each day.
+
+{% raw %}
+
+```yaml
+mode: single
+triggers:
+  - trigger: time
+    at: "03:03:03"
+conditions: []
+actions:
+  - action: button.press
+    target:
+      entity_id: button.tp_358_xxxx_your_device_set_date_time
+    data: {}
+```
+
+{% endraw %}