How to override date/time with value from mqtt data?

I have a sensor which updates on a time interval. the sensor provides multiple attributes / sub sensors, so I have split it to separate sensors in Home-assistant. so far so good.
Only thing I’m stuck with is the data / time provided in the data. in Home assistant the sensors are showing the data at the time the data is published. I want this to be the date/ time provided by the sensor in the data. How can I do this?

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As far as I know, you can’t. How much difference is there?

currently up to half an hour. thing is that it is not a fixed difference.