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Format of date stored as text compared to date() => problem with month

Posted on 2014-01-29
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Last Modified: 2014-01-29
I'm using format to arrange a date time stored as text:

Format(Mid([CUSTOM_FIELD],5,2) & "/" & Mid([CUSTOM_FIELD],7,2) & "/" & Left([CUSTOM_FIELD],4),"mm/dd/yyyy")

so that I can then use date() to work out data from yesterday date()-1

The trick is that my formating creates a month as 2 digits always and date() will return the month as a single digit creating a situation where 01/28/2014 and 1/28/2014 are not recognized as the same.

I'm wondering what I can do with this to correct for this:

WHERE (((Format(Mid([CUSTOM_FIELD],5,2) & "/" & Mid([CUSTOM_FIELD],7,2) & "/" & Left([CUSTOM_FIELD],4),"mm/dd/yyyy"))=Date()-1));
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Question by:ghettocounselor
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Accepted Solution

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mbizup earned 2000 total points
ID: 39817826
Try this (compares both sides using the same format):

WHERE (((Format(Mid([CUSTOM_FIELD],5,2) & "/" & Mid([CUSTOM_FIELD],7,2) & "/" & Left([CUSTOM_FIELD],4),"mm/dd/yyyy"))=Format(Date()-1),"mm/dd/yyyy)");

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Or if your text field is a standard/valid date format:

WHERE CDate([CUSTOM_FIELD])  = dateadd("d", -1, Date())
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Author Closing Comment

by:ghettocounselor
ID: 39817850
Sweet, thanks for quick response.
Notes:
Needed one more paren after format
Format((Date()-1),"mm/dd/yyyy")
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Expert Comment

by:awking00
ID: 39817876
It appears that your "dates" are stored as text in a 'yyyymmdd' format, so it might be easier to convert date() - 1 to text to do the compare. This only works for that format since any comparison will be based on ascii values.
where custom_field = format(date() - 1,"yyyymmdd")

A good example why you should NEVER store dates as anything other than date/time datatypes if you need to perform any kind of data math.
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LVL 32

Expert Comment

by:awking00
ID: 39817890
Be careful! ASCII comparisons can produce some unwanted results. For example,
01/15/2014 will come before 02/15/2013. The reason I said you can get away with yyyymmdd formats.
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