can anyone tell me how to know first week of the month

Hi Mady,

try this, it will return you the week number

static int GetWeekNumberOfMonth(DateTime date)
        {
            date = date.Date;
            DateTime firstMonthDay = new DateTime(date.Year, date.Month, 1);
            DateTime firstMonthMonday = firstMonthDay.AddDays((DayOfWeek.Monday + 7 - firstMonthDay.DayOfWeek) % 7);
            if (firstMonthMonday > date)
            {
                firstMonthDay = firstMonthDay.AddMonths(-1);
                firstMonthMonday = firstMonthDay.AddDays((DayOfWeek.Monday + 7 - firstMonthDay.DayOfWeek) % 7);
            }
            return (date - firstMonthMonday).Days / 7 + 1;
        }

Output

Console.WriteLine(GetWeekNumberOfMonth(new DateTime(2022, 9, 5)));  // 1
Console.WriteLine(GetWeekNumberOfMonth(DateTime.Now); // 4