Re: Dates and Math - Simple Subtraction
This WebDNA talk-list message is from 2004
It keeps the original formatting.
numero = 58887
interpreted = N
texte = You cannot specify a format with the [math date] syntax. However, since your search specifies "SOLDtype=date", what WebDNA does internally is convert your parameter from a date to a number AND the SOLD value from every record in your database from a date to a number, then compares them as numbers. So, WebDNA will be comparing numbers to numbers as long as it understands the human-readable dates provided, which it does in your case. Note that this is one reason many WebDNA developers choose to store dates in their databases as [math]{[date]}[/math] values, rather than as human-readable dates. Searches are faster because WebDNA doesn't need to convert the dates to numbers. - brian On Jul 26, 2004, at 3:30 PM, David Cate wrote: > Oh yes! I saw that before I sent it, but still didn't work. > > I do like the simple step, but what if I'm searching for a six > character date? 00/00/00 > > Can I use the format with the [math date] > i.e. [math date format=%m/%d/%y] > > Thanks for taking time out with a hack to help... > > David > > On Jul 26, 2004, at 5:58 PM, Brian Fries wrote: > >> I step 3), you use a variable named [THREEWEEK] - your previous steps >> created the [TWOWEEK] variable. >> >> You should be able to simplify this into one easy step: >> >> [text]SOLDDATE=[math date]{[date]}-14[/math][/text] >> >> The {[date]} results in a number (days since the year 0000), from >> which you can simply subtract 14 days. >> >> The [math date] turns that number back into a human-formatted date >> (using you preferences settings). >> >> - brian >> >> On Jul 26, 2004, at 2:12 PM, David Cate wrote: >> >>> Hello, >>> >>> I'm trying to only show records that exist within the past two >>> weeks. If an item was sold more than two weeks ago, we don't want to >>> display the record. >>> >>> Can someone tell me where I've gone wrong? >>> >>> 1. Define [TODAY[ >>> [text]TODAY=[date %m/%d/%y][/text] >>> (Note: Database already carries 00/00/00 value) - Number turns out >>> fine >>> >>> 2. Define two week value >>> [text]TWOWEEK=[Math]{[TODAY]}-{00/14/00}[/Math][/text] >>> (This seems to be the problem - This turns out a number 34870 - not >>> sure how that happened. >>> >>> 3. Format TWO WEEK to var [SOLDDATE] >>> [text]SOLDDATE=[format days_to_date >>> %m/%d/%y][THREEWEEK][/format][/text] >>> (value turns out 00/00/00) >>> >>> Here's the search query...which obviously does not work. Anyone have >>> any suggestions for anything for me look at? >>> [search >>> db=admin/cars- >>> n.db&geSTOCKdata=[blank]&geSolddata=[SOLDDATE]&SOLDtype=date] >>> >>> Thanks in advance. >>> >> -- Brian Fries, BrainScan Software -- >> http://www.brainscansoftware.com -- ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list
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You cannot specify a format with the [math date] syntax. However, since your search specifies "SOLDtype=date", what WebDNA does internally is convert your parameter from a date to a number AND the SOLD value from every record in your database from a date to a number, then compares them as numbers. So, WebDNA will be comparing numbers to numbers as long as it understands the human-readable dates provided, which it does in your case. Note that this is one reason many WebDNA developers choose to store dates in their databases as [math]{[date]}[/math] values, rather than as human-readable dates. Searches are faster because WebDNA doesn't need to convert the dates to numbers. - brian On Jul 26, 2004, at 3:30 PM, David Cate wrote: > Oh yes! I saw that before I sent it, but still didn't work. > > I do like the simple step, but what if I'm searching for a six > character date? 00/00/00 > > Can I use the format with the [math date] > i.e. [math date format=%m/%d/%y] > > Thanks for taking time out with a hack to help... > > David > > On Jul 26, 2004, at 5:58 PM, Brian Fries wrote: > >> I step 3), you use a variable named [THREEWEEK] - your previous steps >> created the [TWOWEEK] variable. >> >> You should be able to simplify this into one easy step: >> >> [text]SOLDDATE=[math date]{[date]}-14[/math][/text] >> >> The {[date]} results in a number (days since the year 0000), from >> which you can simply subtract 14 days. >> >> The [math date] turns that number back into a human-formatted date >> (using you preferences settings). >> >> - brian >> >> On Jul 26, 2004, at 2:12 PM, David Cate wrote: >> >>> Hello, >>> >>> I'm trying to only show records that exist within the past two >>> weeks. If an item was sold more than two weeks ago, we don't want to >>> display the record. >>> >>> Can someone tell me where I've gone wrong? >>> >>> 1. Define [TODAY[ >>> [text]TODAY=[date %m/%d/%y][/text] >>> (Note: Database already carries 00/00/00 value) - Number turns out >>> fine >>> >>> 2. Define two week value >>> [text]TWOWEEK=[math]{[TODAY]}-{00/14/00}[/Math][/text] >>> (This seems to be the problem - This turns out a number 34870 - not >>> sure how that happened. >>> >>> 3. Format TWO WEEK to var [SOLDDATE] >>> [text]SOLDDATE=[format days_to_date >>> %m/%d/%y][THREEWEEK][/format][/text] >>> (value turns out 00/00/00) >>> >>> Here's the search query...which obviously does not work. Anyone have >>> any suggestions for anything for me look at? >>> [search >>> db=admin/cars- >>> n.db&geSTOCKdata=[blank]&geSolddata=[SOLDDATE]&SOLDtype=date] >>> >>> Thanks in advance. >>> >> -- Brian Fries, BrainScan Software -- >> http://www.brainscansoftware.com -- ------------------------------------------------------------- This message is sent to you because you are subscribed to the mailing list . To unsubscribe, E-mail to: To switch to the DIGEST mode, E-mail to Web Archive of this list is at: http://webdna.smithmicro.com/
Brian Fries
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