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CDate() function

Posted on 2004-04-20
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Last Modified: 2013-12-26
Does anyone know why CDate(05/08/0001) is returning me 05/08/2001...And the IsDate function returns this as a valid date as well...I need a function that will return false, because this is not a valid date, or at least I dont think it is....
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Question by:BigBadBarnes
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by:dancebert
ID: 10872957
To answer your second question, 05/08/0001 is a valid date: May eighth in the year one.
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appari earned 125 total points
ID: 10874810

In Microsoft Windows, the range of valid dates is January 1, 100 A.D. through December 31, 9999 A.D

and the years less than 100 are translated to a year with a prefix 19 or 20 based on your regional settings. in your systems regional settings if you see the date settings tab you can see how to interpret 2 digit years.

all date functions see if the string can be converted to a valid date or not. so IsDate function returns true for 05/08/0001 becoz its converting the date to 05/08/2001

if you check cdate("05/08/0031") it reutrns you 05/08/1931.
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Expert Comment

by:Dhaest
ID: 10875283
What format of date are you using ? American or european layout ? (so mm/dd/yyyy or dd/mm/yyyy)
For example:
'if 2/12/99 is 2nd December or 12th Febuary if you don't know which system your machine is using

It will return both valid.
Suppose you have on  your system the american format, then 12/13/2004 will be valid, but 13/12/2004 will be invalid (while you can suppose that it's the other way).

You can also format your date and then validate it with isDate

Here you can find a function to see if a date string is valid using regional date settings
http://www.vb-helper.com/howto_validate_date_international.html
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