I bought the tires in April/May 2023 and started using them in August 2023. Ride outdoor for AUgust-October, November to March was indoor and then april was outdoor.
I haven’t taken the tires off the wheels yet but as soon as I do, I’ll check out the date code.
Heat, yeah, unfortunately not much control over it. Here in Delhi, even the mornings are 30C < April to October and days go up to 45 C for many weeks. While the bike in indoor, I have the AC running only for a couple of hours in the day, rest the room does get hot. But this month is the first month of real summer heat this tire is seeing.
There is indeed a ceiling fan in the room that runs almost 20 hours. day, every day for all but a couple of months because its Indian’s summers 
No other motor in the room other than an AC compressor, but thats outside the room.