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>If I record that upcoming datetime in UTC but I forgot about a daylight savings time change between now and then

There are good reasons for not storing in UTC but this doesn't seem to be one of them. Surely the problem in this case is just that you incorrectly converted to UTC? It's just a bug.

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Daylight saving time rules can change... Just because you stored it correctly now doesn't mean it is correct in the future (when it's needed).

> Daylight saving time rules can change

Which is why all of the good date-time libraries come with the standard timezone database, which contains a full history of timezone changes. So, (carefully) using one of those libraries, you should be handle to handle any date-time ever.

Timezone dbs lag, so do not solve every problem.

Sure but that is a separate issue - in that case you didn't 'forget' about it

But it's not an issue to begin with if you just store it in the correct local time zone.

I am not advocating anything other than that

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