using date times in vb.net program

I have a program that compares the date of an invoice to the date using
mydate as date = now

The program I realize is that if the user changes their system date, then that is the date that will be pulled from this line of code.

I know I can use  a getdate() statement and get it from my sql server, but I was wondering what the correct way is to handle this problem.

thanks
mgmhicksAsked:
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CodeCruiserCommented:
>The program I realize is that if the user changes their system date, then that is the date that will be pulled from this line of code.


One option is to use a date server on the net to get the date

http://www.codeproject.com/Tips/356303/How-to-get-server-side-date-time-without-your-own
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Paul JacksonSoftware EngineerCommented:
Is this an ASP.net web forms application/site ? If so getting the current date on the code-behind pages or a business layer class is the recommended method as this will use the date/time from the IIS server rather than the client.
If it is a windows forms application then getting the date on the SQL Server is probably the best and most reliable method as client dates can be suspect, and also problematic if the application is used by clients in differing time zones.
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Kamal KhaleefaInformation Security SpecialistCommented:
try to set a unique format for you date
or in your code behind format the date like this

   dim ExpiryDate as date = DateTime.ParseExact(MyTextBoxID.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture)
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