ISDATE


Tests if a string can be converted to a Date Serial

Syntax:
declare function IsDate ( byref stringdate as const string ) as long

Usage:
#include "vbcompat.bi"
result = IsDate( stringdate )

Parameters:
stringdate
the string to test

Return Value:
Returns non-zero (-1) if the date string can be converted to a Date Serial, otherwise returns zero (0).

Description:
Date strings must be in the format set in the regional settings of the OS to be considered valid dates.

IsDate(Date) will return non-zero (-1) only if the regional settings specify the same date format that QB used.

The compiler will not recognize this function unless vbcompat.bi or datetime.bi is included.

Examples:
#include "vbcompat.bi"

Dim s As String, d As Integer

Do
  Print
  Print "Enter a date: "

  Line Input s

  If s = "" Then Exit Do

  If IsDate( s ) = 0 Then
    Print "'"; s; "' is not a valid date"
  Else
    d = DateValue( s )
    Print "year  = "; Year( d )
    Print "month = "; Month( d )
    Print "day   = "; Day( d )
  End If

Loop


Differences from QB:
See also:
Back to Date and Time Functions
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