How the hell is that possible? Every platform out there has high quality date libraries. It's a cliché that date & time operations are very complicated (leap ye

How the hell is that possible? Every platform out there has high quality date libraries. It's a cliché that date & time operations are very complicated (leap years, leap seconds, time zones, daylight saving time and so on), every even marginally competent developer knows instinctly to stay away from writing their own date & time code and trust a library instead to do the heavy lifting. In addition, every tester should know that when dates are involved, they should try Feb 29th and see if it breaks anything. How can bugs like this slip through?