kyuridenamida's blog

Do you know the Fairfield's congruence?
By kyuridenamida, 10 years ago, In English

Hello. Do you know the Fairfield's congruence?

Firstly, if m is 1 or 2, compute y=y-1,m=m+12. Then calculating this formula, you can get the number of days between an arbitrary date and 01/01/0001.

In Japan, this formula is known as the Fairfield's congruence, but I have never seen the foreign people who have been talking about it.

It is mentioned in only the Japanese Wikipedia's page of "Zeller's congruence" below. http://ja.wikipedia.org/wiki/%E3%83%84%E3%82%A7%E3%83%A9%E3%83%BC%E3%81%AE%E5%85%AC%E5%BC%8F

Do you know who Fairfield is? I don't know.

Do you know a famous formula like the Fairfield's congruence?

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10 years ago, # |
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I think this is what you are referring to, https://en.wikipedia.org/wiki/Julian_date#Calculation ,yet I can't see any "Fairfield" on the page, also search results for "Fairfield congruence/formula" doesn't show anything useful. I think someone made that naming up and it spread among the Japanese programmers. By the way, Fairfield is a city in California, maybe this is somehow related...

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    10 years ago, # ^ |
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    I'm sorry to delay in replying to you. Thanks. I learned about the Julian date in the link. Yeah, Fairfield exists in the real world. That's why I wondered the formula's name. Maybe, someone tricked Japanese programmer!

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