Former software engineer here. Most things that are programmed work great when things are "normal" since that's the condition that the software is tested under.
I've seen many times where switching to or from daylight savings causes havoc with software due to a bug getting by the quality assurance team for that product.There's a reason that daylight savings happens on a weekend. Too risky of a change to make while many of the global stock markets are open and other 9-5 stuff is happening.
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