sql - Error converting Nvarchar data type to datetime from VB.NET -

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i have problem regarding dates program stored procedure in sql.

my program takes date excel spreadsheet , parses such:

            tempdate = date.fromoadate(exws.cells(exrow, mymatchedcolumns(2)).value)             dim format() = {"dd/mm/yyyy", "dd-mm-yyyy", "yyyy-mm-dd"}             duedate = date.parseexact(tempdate, format,             system.globalization.datetimeformatinfo.invariantinfo,             globalization.datetimestyles.none)

duedate 'date' variable i'm assuming @ point 'duedate' universal date object. think best way parse both english regional date , polish dates, since used on polish machine.

however, when sending values stored procedure:

        mysqlstring = "exec bsp.partprice_sp " & _             "'" & duedate & "', " & _             "'" & mypartid & "', " & _             "'" & currency & "'"

english sends exec bsp.partprice_sp '01/09/2015', 'l555', 'usd' returns price.

polish sends exec bsp.partprice_sp '2015-09-01', 'l555', 'usd' incurs error:

the conversion of nvarchar data type datetime data type resulted in out-of-range value.

i understand error, next execution of stored procedure, polish machine sent 2015-09-10 returned price fine. i'm guessing since 2015-10-09 still within range interestingly returned correct price 10th september 2015.

nevertheless i'm struggling find universal way of executing stored procedure in both english , polish. can give parse dates correctly makes sql happy awesome.

thanks.

program written in vb .net.

p.s if change @duedate in stored procedure nvarchar datetime, an:

error converting data type varchar datetime.

error, i'm guessing english format. many thanks.

date formats in inline non-parameterised queries 1 of things can drive spare in experience.

so -

  1. if @ possible issue sqlcommand collection of sqlparameters, add actual date-typed .net variables. safer.
  2. if have keep inline sql reason, never pass in regionalised date formats. reliably break odd reasons. ideally send server yyyy-mm-dd hh:mm:ss.ms, safe run through centralised function - partly it's easier making sure you're calling right .tostring() format in places correctly, partly i've in past had occasional servers complain @ format.

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