Converting long values from legacy systems to date fields

This tip desribes how to convert long values from legacy systems to date fields.

Often times legacy systems that we connect to store dates as an 8-digit, integer value in for format yyyymmdd, for example 20020704 would be July 4, 2002. I have tried numerous versions of the Format function, including General Date and m/d/yyyy but always end up with a goofy date, such as 12/31/9999. Here is an approach to convert these 8-digit values into a Notes Date field.

In this example, the field INVDT in olddoc is a number field and contains the 8-digit value read from a legacy system. InvoiceDate in newdoc is a date/time field.


invdt& = Clng(olddoc.INVDT(0)) ' first get the value into a variable of type long, in my example the value is 20020704 tempmo% = invdt& Mod 10000 ' store the least significant 4 digits, in my example the value is 704 tempval& = invdt& - tempmo% ' now remove the least significant 4 digits from initial value, in my example this is 20020000 Yr% = tempval& \ 10000 ' now remove the trailing 0's from tempval, result is 2002 Da% = tempmo% Mod 100 ' now get the least significant 2 digits from tempmo, in my example the value is 4 Mo% = (tempmo% - Da%) \ 100 ' And now remove these least significant digits to get a month, in my example, 7 newdoc.InvoiceDate = Datenumber(Yr%, Mo%, Da%) ' Now I can call Datenumber with 2002, 7, 4 to get a date value.
This was first published in September 2002

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