+- HP Forums (https://www.hpmuseum.org/forum)
+-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html)
+--- Forum: HP Prime (/forum-5.html)
+--- Thread: Calendar calculations (/thread-3296.html)
Calendar calculations - ggauny@live.fr - 03-07-2015 08:08 PM
Good evening,
Sometimes it is important to know in which number-week is a date of appointement, or a delivery post, a RDV for work and so on. I have maked this formula, according with ISO 8601 norm :
N°week=IP([DOW(1/1/AAAA)+DOY(JJ,MMAAAA)+5]/7)-[IP(DOW(1/1/AAAA)/5]
For example : in what week is 18/06/1582 ?
N°W= DOW(1/1/1582) it is 1
DOY(18/06/1582) it is 169
then : 1+169+5 it is 175, then quotient by 7 it is 25
And because ip(1/5) it is 0
the anser is 25+0=25.
well : the 18/06/1582 is into the week number 25.
Gérard.(I dedicace for Katie because her is gentile).
RE: Calendar calculations - Katie Wasserman - 03-12-2015 02:16 PM
Gérard,
I moved this to the Prime Forum for better visibility, and thank you for the dedication!