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IsDate Function
This standard VB function indicates whether or not an expression is a legal date.
Syntax
IsDate(expression)
Returns
-1 (TRUE) if expression is a legal date, 0 (FALSE) if it is not.
Usage
IsDate returns -1 (TRUE) if the expression is of vartype 7 (date) or a string that can be interpreted as a date.
Example
This example adds a number to today's date value and checks to see if it is still a valid date (within the range January 1, 100 AD, through December 31, 9999 AD).
Sub Button_Click
Dim curdatevalue
Dim yrs
Dim msgtext
curdatevalue = DateValue(Date$)
yrs = 20
yrs = yrs * 365
curdatevalue = curdatevalue + yrs
If IsDate(curdatevalue) = -1 then
msgtext = Format(CVDate(curdatevalue))
Else
"The date is not valid."
End If
End SubSee Also
CVDate Function
IsEmpty Function
IsNull Function
IsNumeric Function
VarType Function
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Siebel VB Language Reference Published: 18 June 2003 |