Please disregard and forget what I wrote below.
It just isn't true.
The formula will fail on some odd dates.
The reason is that the average lenth of a calendar year is not constant
but depends on the year interval used . E.g. 2000-2099 has an average
year of 365.25
but 2000-2399 has 365.247525
Sorry.
-- mats
Mats Carlid skrev:
A final (?) note on year calculation shortcuts:
Had Dick chosen jan 1 in a year divisible by 400 as day 1 then
INT(DAY / 365.247525 )
would have worked all the time.
But selecting a '400-year' starting on a sunday would result in quite
long internal dates unless year 2000 started on a sunday ( it didn't).
365.25 can only work for a limited time as it doesn't observe
the 100 and 400 year rules ...
-- mats
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