@NicoHaase I have tagged this with PHP because I am using PHP for the server-side. and I would accept a PHP-based answer also. I have already solved the issue if the shifts are all in one day and it was working fine until now. The problem came because of the overlap of days. The solution I have implemented is obsolete and I believe it doesn't add any value to the question. I am searching the internet for the past day and was not able to find any lead which is why I decided to ask the community.
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