HP Prime: Day Number of the Year

01212014, 01:24 PM
Post: #1




HP Prime: 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 nonleap 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 HP Prime Program DAYNO: EXPORT DAYNO(M,D) BEGIN IF M≤2 THEN RETURN IP(30.6*M+368.8)+D399; ELSE RETURN IP(30.6*M+1.6)+D34; END; END; 

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HP Prime: Day Number of the Year  Eddie W. Shore  01212014 01:24 PM
RE: HP Prime: Day Number of the Year  Damien  01212014, 03:31 PM

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