date syntax vb6

I have traced an issue with syntax on line 1.  Sometimes the code works and sometimes it does not based on how I type the date 7/1/2017.  What is the correct way to do the syntax

    If DTPicker1.Value < "7/01/2017" Or DTPicker1.Value > MaximumDate Then
        MsgBox "The DATE you entered is Not Authorized.  Please Re-Enter a Valid Date.  Date will be reset.", vbOKOnly, "Invalid Date"
        DTPicker1 = ServerTime
        Text2.SetFocus
    End If

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al4629740Asked:
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
try this instead:

    If DTPicker1.Value < cdate("01/07/2017") Or DTPicker1.Value > MaximumDate Then

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or:

    If DTPicker1.Value < cdate("7 Jan 2017") Or DTPicker1.Value > MaximumDate Then

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al4629740Author Commented:
Thank you.   I also just tested this below and it seemed to work.  Is this ok?

 
cdate(DTPicker) < "1/7/2017" Or DTPicker1.Value > MaximumDate Then

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Nitin SontakkeDeveloperCommented:
I believe the best approach would be either "2017-01-07" i.e. yyyy-MM-dd or "07-Jan-2017" dd-MMM-yyyy.
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
DTPicker should returns you with a date value, hence you no need to convert it again.

hence, you may try:

DTPicker) < cdate("1/7/2017") Or DTPicker1.Value > MaximumDate Then

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or:
DTPicker < #1/7/2017# Or DTPicker1.Value > MaximumDate Then

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(Don't have VS6 to test this but it may work)
Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
or use DateSerial function

DateSerial(year, month, day)

DTPicker) < DateSerial(2017, 1, 7) Or DTPicker1.Value > MaximumDate Then

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al4629740Author Commented:
Is it wrong to use this format "1/7/2017" vs. "2017-01-07"
Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
Is it wrong to use this format "1/7/2017" vs. "2017-01-07"
both are not equal, but to convert it as a date value, try apply CDate function.

you can try:

if  cdate("1/7/2017") = cdate("2017-01-07") then
    msgbox "Same"
else
    msgbox "Different"
end if

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Nitin SontakkeDeveloperCommented:
I think the "1/7/2017" is machine dependent and "2017-01-07" is machine independent. If the application is Windows Forms application, used in a small office in US, this probably doesn't matter much.

However, when same application is shared with yet another branch in London, it won't work as expected. Today, you may not expect your employer / client / customer would open a branch in London ever or in foreseeable future, but then again, why not cater to it right away and gain prolonged peace of mind.

This is the key to writing "resilient" software. Also notice the return on investment ratio here.
Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
sorry, got to use:

If CDate(#1/7/2017#) = CDate(#1/7/2017#) Then
    MsgBox "Same"
Else
    MsgBox "Different"
End If

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or:

If #1/7/2017# = #1/7/2017# Then
    MsgBox "Same"
Else
    MsgBox "Different"
End If

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tested in VBA.

CDate("1/7/2017") is depending on system settings to determine the converted value, which is not reliable.

agreed with Nitin that need to use a more recognizable format for the dates
al4629740Author Commented:
Thank you
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Visual Basic Classic

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