Display date/time tag with temperature reading

New to home assistant and MSQTT. So far I have a MQTT ESP8266 based sensor reporting the temperature to MQTT + Home Assistant running on an old ubantu box.

I would like to display the date/time at which the current temperature was collected. Something like 80F Jan 10, 2:32PM.

My configuration.yaml file contains this entry for the temperature sensor

 sensor:
  platform: mqtt
  state_topic: "ha/_temperature1"
  name: "Back garden"
  unit_of_measurement: "°C"
  qos: 1