Too Long; Didn't Read
There is a whole lot of methods to represent date and time in computers. You can store it as Unix epoch, string, with or without a timezone, and so on. Transforming it into something more human-friendly, something like a year, month, day, etc. The wrong time formatter could still still be your time. The bug spotted by PySpark is a mistake that took a few hours to figure out. It is useful when you need to display time in AM/PM format but not something one would like to see during data analysis.