Get start date of week by year and week number.

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Posted on by Vijay Yelmame VY

Hi Team,
I want to get first day of the week by given week number and year.

Example: 0523 then it should return 30/01/2023.

I have tried below code, but it is returning 29/01/2023. Please suggest where i am doing wrong.

public static date Week2Date(int year, int week)
    {
        int         yr       = year;
        xSession    xSession = new xSession();
        Date        testDate = DateTimeUtil::getStartOfYearDate(xSession.PreferredLocale(),str2Date(strFmt("%1-01-01", yr), 321));
        Int         weekdays;
        int         wktmp    = (week>1)? (week -1)*7 : 7;
       
        testdate = datetimeutil::date( datetimeutil::addDays(datetimeutil::newDateTime(testdate,0) ,  wktmp));

        if (DateTimeUtil::getWeekOfYear(xSession.PreferredLocale() ,testDate) != week)
        {
            if (week > DateTimeUtil::getWeekOfYear(xSession.PreferredLocale() ,testDate))
            {
                weekdays = 7;
            }
            else
            {
                weekdays = -7;
            }
            while (DateTimeUtil::getWeekOfYear(xSession.PreferredLocale() ,testDate) != week)
            {
                testDate = testDate   weekdays;
            }
        }
        return DateTimeUtil::getStartOfWeekDate(xSession.PreferredLocale() ,testDate);
    }