Actually, all "standard" time means is that the time is somewhat related to the sun being directly overhead at noon. I say "somewhat" because once you carve the world up into zones like that, the sun will never be directly overhead at noon except maybe in the middle of the zone.
Did you know China has only one time zone? The entire huge country runs on Beijing time. The far west of the country sometimes doesn't see a sunrise until 10 AM.
So, there is really nothing "standard" about Standard Time at all.
If I am reading the article correctly, the point of the lawsuit is not that they used AI to make their staffing decisions. It's that the criteria they asked the AI to use to make those decisions directly disadvantaged people who were on approved leave for medical reasons, and whose jobs were supposed to be protected by law.
It's an important distinction. These decision makers delegated their staffing decisions to a bot. But bots are not people. If the instructions given to those bots resulted in actions that violated the law, the decision makers need to be held accountable, I the same manner they would if they made those decisions without AI assistance.