We’ve been celebrating a new year with some examination of dates: the fact that 2020 is a new decade (sort of) and a leap year (definitely), and now, some details about how the whole Gregorian calendar works. Some of this is collected in the Ask Dr. Math FAQ on The Calendar and the Days of …
Last week we looked at some questions that arose leading up to the year 2000, triggered by the 20th anniversary of that event. Now we’ll start from a different question about that year, to look at the story of leap years. Was 2000 a leap year, or not? Here is the question from 1999: Year …
The arrival of 2020 has brought to mind the various controversies at the start of the year 2000, also called Y2K. As a software engineer responsible for date-sensitive communications within large computer systems, I well recall being on call that Saturday, in case something went wrong. I also recall all the questions we got in …