Basics of working with date and time for Software Engineers, Developers and Programmers

One thing that baffled me recently is how so many companies still produce products with sub-standard date and time treatment. In 2023/2024, how hard is it to serve ISO-8601 compliant timestamps out of an API? Or not require manual time adjustment following day light savings? Or not require you to interpret  dates like 01/02/03 as strings in databases?

In this video, I cover the basics of basics for working with dates and times in software. I cover

how time offsets work,

how time zones work and how they are different to time offsets,

how unix timestamps work and

how ISO8601 timestamps work.