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Tip of the Day
Language: VB5,VB6
Expertise: Intermediate
May 13, 2000

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On-Demand

Application Security Testing: An Integral Part of DevOps


Don't use = operator on Date values

Date variables store values in floating point format, much like Double variables, with the integer part for dates and the fractional part for the time portion. Being floating point values, Data values may be subject to rounding problems, and for this reason you shouldn't test two Date variables for equality using the "=" operator.

Instead, use the DateDiff function, or evaluate the difference between the two values and check that it's less than a very small value, as in:


If Abs(Date1 - Date2) < 1E-10 Then
    MsgBox "Same dates"
End If
Francesco Balena
 
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