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Editorial Team
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Asked: 2026-05-31T15:53:14+00:00

I’m looking for a definitive, standard (i.e. certified as being correct or tested reasonably

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I’m looking for a definitive, standard (i.e. certified as being correct or tested reasonably thoroughly) for calculating the ISO week from a date, in Visual Basic (i.e. to run in a Visual Studio Express 2010 Visual Basic project)

(Unsuccessful) Research so far:

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  1. Editorial Team

    Thanks @assylias – an answer in that question is pretty close, if not exactly what I’m looking for: https://stackoverflow.com/a/1226248/227926

    Note to use this solution I should add that you need to import the Calendar abstract class defintion:

    Imports System.Globalization

    AND then instantiate an Instance of Calendar, I chose Gregorian Calendar as it is the defacto standard, but there are other (cultural) options:

    Dim myCalendar As Calendar = New GregorianCalendar

    Then, to quote the solution ( https://stackoverflow.com/a/1226248/227926 ):

    You can use the Calendar.GetWeekOfYear method to get the week number
    of a date, with the CalendarWeekRule.FirstFourDayWeek value to specify
    how the weeks are determined, and DayOfWeek.Monday to specify the
    first weekday. That follows the ISO specification.

    Example:

    int week = myCalendar.GetWeekOfYear(DateTime.Today,
CalendarWeekRule.FirstFourDayWeek, DayOfWeek.Monday);

    I will not mark my question as a duplicate, because their question title “Calculate the start and end date of a week given the week number and year in C# (based on the ISO specification)” is distinctly different from mine and they mention C# (not Visual Basic although they do want Visual Basic as well).

    Keeping my question present should help others in their search for the same.

    Thanks!

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