Have you looked for this feature in other issues and in the docs?
briefly
Is your feature request related to a problem? Please describe.
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no
Describe the solution you'd like
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prepend current log strings that already have timestamp to include Date
Describe alternatives you've considered
_A clear and concise description of any alternative solutions or features you've considered._
none
Additional context
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(Please, remember to close the issue when the problem has been addressed)
Tasmota already sends the full date and time stamp by MQTT.
In the console is not very useful due to the buffer is very small and you can see just last few entries. If you keep the brower open, you will see more but that is just your browser's cache, not Tasmota.
If you set a SYSLOG (as explained in the docs) you will have the length of logs that you need. The data in the syslog has already the date and time, and you can have there the logs of more than just one Tasmota device if you want.
I have NO interest in MQTT.
Why have ONLY a time stamp in the Log String ?
guess I have to live in my own world and leave my ridiculous thoughts to myself.
Not that you are interested ,but It's configurable in my builds.