4 digit Julian Date in RSLogix 5000??

[bernie_carlton]

I think he's depending on the CPT command performing all mathematics in integer form, in which case the following test for equality will only pass in leap years.

Yes - this will fail in the year 2100 but do we really care?

 

[manmeetvirdi]

Interesting way to calculate that !
2009/4=502.25
502.25*4=2009

but if rounding of is taking place because z_leap_year is DINT
then 2009/4=502
502*4=2008

Eureka !!

 

[TheStarr]

Bernie is exactly right. Can't remember where I got the idea but I tried it on many different years within a reasonable range (never got to 2100!) and it always works.

It is nice to be able to take advantage of an expressions limitations and use it for something cool!

 

[SkullZipper]

Kind of nice taking advantage of it being an Integer. I had to pop open my calculator quick and check it out for myself. Always nice to learn something thanks.