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Coldfusion  working with Julian dates

Posted on 2010-09-14
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Last Modified: 2012-06-27
I want to get yesterdays Julian date. I thought I could just add "-1" to the below code but it doesn't work. can someone show me the correct way to get yesterdays julian date? thanks!

<cfparam name = "dayOfYear" default="#NumberFormat(DayOfYear(Now()),"000")#" >
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Question by:Bang-O-Matic
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9 Comments
 
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Accepted Solution

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_agx_ earned 2000 total points
ID: 33675056
I've never done it myself. But it doesn't seem as simple as that.  I'd check cflib.org. If you search on "Julian" they've got a couple functions like

http://www.cflib.org/udf/GetJulianDay
http://www.cflib.org/udf/GetModifiedJulianDay
http://www.cflib.org/udf/JulianDayofWeek
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Author Comment

by:Bang-O-Matic
ID: 33676600
Still stuck... anyone else?
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LVL 52

Expert Comment

by:_agx_
ID: 33677485
>> Still stuck... anyone else?

Well .. if you want anyone else to help, I think you'll have to describe what results you're getting _now_ and how they're different from the desired you want ;-)
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Author Comment

by:Bang-O-Matic
ID: 33677728
I think I have it working:

<cfparam name = "julianday" default="#NumberFormat(DayOfYear(Now()))#">
<cfset Yesterday = #julianday# - 1>
<CFOUTPUT>#Yesterday#</CFOUTPUT>

The problem is I have to download new photozips daily and the file names are julian dates like "photozip_257.zip" but the newest file is always dated from the prior day...if that makes sense.
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Author Comment

by:Bang-O-Matic
ID: 33677738
Lol, point well taken agx, I didnt properly describe the issue.
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LVL 52

Expert Comment

by:_agx_
ID: 33677929
No problem :)  I just wanted to make sure you got a good response.  But I'm glad to hear you figured it out yourself.
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Author Closing Comment

by:Bang-O-Matic
ID: 33677968
Thanks for the help!
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LVL 52

Expert Comment

by:_agx_
ID: 33678578
Hmm.. you may want to add special handling for the 1st day of the year. Otherwise #Yesterday# will end up being "0" on January 1st.

<cfparam name = "julianday" default="#DayOfYear(Now())#">
<cfif julianDay eq 1>
      <cfset julianDay = DayOfYear(dateAdd("d", -1, now()))>
</cfif>
<cfset Yesterday = julianDay - 1>
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Author Comment

by:Bang-O-Matic
ID: 33678927
right you are! thanks again agx.
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