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The doomsday algorithm is a way to determine the day of the week.
The weekday that is a year's doomsday is whatever weekday it is on the day before March begins (February 28 most years, February 29 leap years). In other words, the last day of February is always a doomsday.
Since 2025 is not a leap year and today is February 28, this means today's weekday Friday is this year's doomsday.
Happy doomsday.
October 17, 2018
Article of The Day
Today was strangely productive day... I learned three cool outdated skills.
Just on a whim, now I can tell what day of the week a specific date is, and know basic morse code, while also learning all the senate race and members.
I also learn how to work a telescope, which is slightly useful.
Why was this strangely productive day? I am not sure.
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The dates 4/4, 6/6, 8/8, 10/10 and 12/12 always fall on the same day of the week. - The Doomsday Rule
Went over some of the first assignment for Computer Science, in class today. Zeller's Congruence and Doomsday Rule. They are some pretty neat things.
Zeller's Congruence turns the a date (yyyy/mm/dd) into a number from 0-6, where Saturday is 0, Sunday is 1, and so on. And the first question has us change it to where Sunday is 0, and Monday is 1, and so on. It was rather easy to figure out with the hint. All I had to do is play around with the hint our prof gave us. That and read the wikipedia article as it has the answer in it.
The Doomsday Rule, is where things really get interesting. Given a formula, we can find out what day of the week, any day of the year lands on. Each year has an "anchor day", which for example this year's is a Monday. And there are certain days of the year that are always the anchor day. Such as 4/4, 6/6, 8/8, 10/10, 12/12. And then the rule for uneven months after 4, I work 5-8, at 7-11. Where 5/9, 7/11, 9/5, 11/7 all fall on the anchor days. Which as previously said this year is a Monday, so all those dates are on a Monday. From this it is rather easy to pick a day of the month and calculate which day of the year it falls on. Other dates that fall on an anchor day are Halloween, Boxing day, and a few others.
