Solved

CFML dates - not getting what I excpected

Posted on 2013-01-31
11
197 Views
Last Modified: 2013-02-03
The following code yields;

tmdate1=*20130131.txt*

tmdate2=*20130131*
tmdate=*57014/06/04*
d:\inetpub\wwwroot\tat.net\development\control\phonedata\CallData_20130131.txt
57014/06/04

The asterisks are just for marking the output and looking for spaces.

<cfset tmdate1="#trim(right(attributes.filename,12))#">
<br>
<cfoutput>
tmdate1=*#tmdate1#*
<br><br>
<cfset tmdate2="#trim(left(tmdate1,8))#">
tmdate2=*#tmdate2#*
<br>
<cfset tmdate = "#dateformat(trim(tmdate2),'yyyy/mm/dd')#">
tmdate=*#tmdate#*
</cfoutput>
<br>
<cfoutput>#attributes.filename#</cfoutput><br>
<cfoutput>#dateformat(left(right(attributes.filename,12),8),"yyyy/mm/dd")#</cfoutput>

Open in new window

0
Comment
Question by:lantervj
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 4
  • 2
11 Comments
 
LVL 36

Accepted Solution

by:
SidFishes earned 500 total points
ID: 38841471
You can't pass 20130131 to date format as it interprets it as a numerical date value (I think)


try this (with a regex shortcut thrown in as a bonus :)

<cfset tmdate=rereplacenocase(attributes.filename, "[^\d]", "", "all")>
<cfset tmdate= "#left(tmdate, 4)#,#mid(tmdate,5,2)# , #right(tmdate,2)#">
#dateformat(tmdate, "yyyy/mm/dd")#

This works as long as the dates are always 8 chars long (ie: not 2013131)
0
 

Author Comment

by:lantervj
ID: 38841577
Works great.  I'd like to know why, but can't stop and play now.
0
 

Author Closing Comment

by:lantervj
ID: 38841579
Great
0
How our DevOps Teams Maximize Uptime

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us. Read the use case whitepaper.

 
LVL 36

Expert Comment

by:SidFishes
ID: 38841638
why is pretty simple

cf doesn't recognize it as a date

#isdate(tmdate)# returns NO

And often when cf doesn't understand format related things, it guesses....

and you get weird results.
0
 

Author Comment

by:lantervj
ID: 38841662
So, your advice to me is;  Stop doing that?
0
 
LVL 52

Expert Comment

by:_agx_
ID: 38841890
> I'd like to know why, but can't stop and play now.

When you pass in something that looks like a number, ie "20130131" DateFormat treats it as the numeric representation of a date (similar to Excel).  That's different than interpreting the string as yyyymmdd.  With numeric dates:

 - 0 is the date 12/30/1899
 - 3 is the date 01/02/1900  (ie 12/30/1899 + 3 days)
- ...
- 20130131 is the date 06/04/57014 (ie 12/30/1899  + 20130131  days)

His code converts your string into something DateFormat recognizes as a date string.
0
 
LVL 52

Expert Comment

by:_agx_
ID: 38841942
Oops... didn't see the other replies before posting.

Like Sid said, CF does a lot of guessing - which is both good and bad. It makes for simpler code,  but if you don't understand *how* it guesses, you're in for a lot of headaches and unexpected results. Especially with dates.  

(Edit) Unfortunately part of the flexibility is that CF doesn't ask how it should parse date strings.  It just examines the input and takes its best guess.  The standard date functions can make sense of most U.S. date strings, but the safest bet is to stick with the non-ambiguous: yyyy-mm-dd format.
0
 

Author Comment

by:lantervj
ID: 38842323
My life has been a living hell since 12/31/1999.   But, I get it.  I really do.  I just FORget it sometimes.  I rely on you guys to remind me.
0
 
LVL 52

Expert Comment

by:_agx_
ID: 38847874
No worries, happens to me too. We don't always notice the names of who's asking or remember their complete background.  So sometimes we may repeat stuff you already know. But I figure it's better to answer the question asked, than not, and let the asker ignore bits they already know.  Nothing worse than taking the time to ask a question and having someone ignore it.  (That's my personal pet peeve :)
0
 

Author Comment

by:lantervj
ID: 38847995
Me too.  I didn't really mean anything by it.  I'm an old fart and thought I was through before y2k.  :)
0
 
LVL 52

Expert Comment

by:_agx_
ID: 38848975
Haha, if only. There's still the fun of daylight savings time changes and conflicting character encoding issues to play with. Just in case we weren't having enough fun ;-)
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article  is about submitting  form through  ColdFusion.Ajax.submitForm to the action page and send a response back in JSON format which later can be decoded using ColdFusion.JSON.decode. By this way you can avoid the usual page refresh for subm…
Sometimes databases have MILLIONS of records and we need a way to quickly query that table to return the results me need. Sure you could use CFQUERY but it takes too long when there are millions of records. That is why SOLR was invented. Please …
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question