topic Re: Is there an inverse to the Day Of Year() function? in Discussions

Is there an inverse to the Day Of Year() function?

mwechtal — Wed, 10 Aug 2016 15:31:34 GMT

I have a day of year column, and need to convert it to a date. I've wracked my brain over this. There's probably a simple solution but it escapes me.

Re: Is there an inverse to the Day Of Year() function?

Jeff_Perkinson — Wed, 19 Oct 2016 03:44:29 GMT

I assume you have a year column as well.

If so, you just need to multiply your Day of Year column by the number of seconds in a day (the In Days(1) function will give you this) and add it to the value for December 31 of the previous year. It sounds worse in prose than it really is.

:Day of Year * In Days(1) + Date DMY(31, 12, :Year - 1)

-Jeff

Re: Is there an inverse to the Day Of Year() function?

mwechtal — Wed, 10 Aug 2016 16:01:22 GMT

Perfect! The data is all this year so far, so I don't need the year column yet.

Thanks! Yes that was simpler than I thought. I was getting frustrated, and I nearly did in in {shudder} Excel, but then I would have had to copy it back and forth every few days.