Re: More DateMath problems
This WebDNA talk-list message is from 1997
It keeps the original formatting.
numero = 13770
interpreted = N
texte = I see what's happening and can understand how it might look like a bug, but I don't think it is. Here's why. The code in WebCatalog sees the 0000 for the year and/or the 00 for the day and assumes the date in question is being added or subtracted to another date. When this occurs, it does it on a field by field basis so 1 month is either added or subtracted to the other date. This is different than converting the date to the number of days since X and adding or subtracting that. If you were to do that, then you would add a fixed number of days, 31 lets say, and the resulting date would not be the same as adding 1 month (sometimes 31 days is a month, sometimes it is a month and a day, sometimes it's a month and 3 days). So, in the example below, the date is being treated as a date (not something added or subtracted). Here's what WebCatalog thinks: The date is 1 day less that 1/1/0000, which is 12/31/-1. Thus the month is 12. The easy fix is to use 01 instead of 00 so the dummy date is always valid. I hope this helps.John.>The code: >[FORMAT Days_to_Date %m][MATH]{1/00/0000}[/MATH][/FORMAT] >[FORMAT Days_to_Date %m][MATH]{2/00/0000}[/MATH][/FORMAT] >[FORMAT Days_to_Date %m][MATH]{3/00/0000}[/MATH][/FORMAT] >[FORMAT Days_to_Date %m][MATH]{4/00/0000}[/MATH][/FORMAT] >[FORMAT Days_to_Date %m][MATH]{5/00/0000}[/MATH][/FORMAT] > >Returns: >12 >01 >02 >03 >04John A. Hill Pacific Coast Software 11770 Bernardo Plaza Ct. #453 * Web tools for Macintosh and WinNT * San Diego, CA 92128 http://www.smithmicro.com
Associated Messages, from the most recent to the oldest:
I see what's happening and can understand how it might look like a bug, but I don't think it is. Here's why. The code in WebCatalog sees the 0000 for the year and/or the 00 for the day and assumes the date in question is being added or subtracted to another date. When this occurs, it does it on a field by field basis so 1 month is either added or subtracted to the other date. This is different than converting the date to the number of days since X and adding or subtracting that. If you were to do that, then you would add a fixed number of days, 31 lets say, and the resulting date would not be the same as adding 1 month (sometimes 31 days is a month, sometimes it is a month and a day, sometimes it's a month and 3 days). So, in the example below, the date is being treated as a date (not something added or subtracted). Here's what WebCatalog thinks: The date is 1 day less that 1/1/0000, which is 12/31/-1. Thus the month is 12. The easy fix is to use 01 instead of 00 so the dummy date is always valid. I hope this helps.John.>The code: >[FORMAT Days_to_Date %m]
[math]{1/00/0000}[/MATH][/FORMAT] >[FORMAT Days_to_Date %m]
[math]{2/00/0000}[/MATH][/FORMAT] >[FORMAT Days_to_Date %m]
[math]{3/00/0000}[/MATH][/FORMAT] >[FORMAT Days_to_Date %m]
[math]{4/00/0000}[/MATH][/FORMAT] >[FORMAT Days_to_Date %m]
[math]{5/00/0000}[/MATH][/FORMAT] > >Returns: >12 >01 >02 >03 >04John A. Hill Pacific Coast Software 11770 Bernardo Plaza Ct. #453 * Web tools for Macintosh and WinNT * San Diego, CA 92128 http://www.smithmicro.com
John Hill
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