Sunrise at 5:30
Computers store the current time as a single integer: the number of seconds since 12:00 AM on January 1, 1970, Greenwich Mean Time. From this integer value, a very complex algorithm must be applied to arrive at the current date and time for your timezone, counting leap years and all that other arbitrary stuff that our Julian calendar has evolved over the centuries. This date determination algorithm exists in all operating systems, all programming languages, and many many types of microprocessor-based hardware. So any time the rules change on how to determine the current time, ALL those algorithms have to be updated.
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