(32SII) Day Number of the Year
01-21-2014, 01:26 PM (This post was last modified: 06-15-2017 01:34 PM by Gene.)
Post: #1
 Eddie W. Shore Senior Member Posts: 1,149 Joined: Dec 2013
(32SII) Day Number of the Year
This formula calculates the day number of any date (given month and day). A 365 day year is used. If you are operating with a leap year with dates after February 28, add 1.

Hence in non-leap years, January 1 is Day 1, February 1 is Day 32, etc..., December 1 is 335, and December 31 is 365.

Details are at my blog: http://edspi31415.blogspot.com/2014/01/h...-year.html

Formula:

Day Number, 365 Day Year, M≤2:
D + IP(30.6M + 1.6 + 367.2) - (34 + 365) = D + IP(30.6M + 368.8) - 399

M>2:
D + IP(30.6M + 1.6) - 34

Here it is in RPN format. I broke up some of the larger numbers into an addition of two smaller ones and used flags to keep the program within one label.

HP 32SII:
Code:
 N01 LBL N N02 CF 0 \\clear flag 0 (any user flag will do) N03 INPUT M N04 2 N05 x≥y? N06 SF 0 \\set flag 0 N07 R-down \\bring M to the X stack N08 30.6 N09 ×  N10 1.6 N11 + N12 FS? 0 N13 367.2 N14 FS? 0 N15 + N16 IP N17 INPUT D N18 + N19 34 N20 - N21 FS? 0 N22 365 N23 FS? 0 N24 - N25 CF 0 N26 RTN
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