获取日期的星期数，其中52作为最高星期数

Question

I need to get the weeknumber of a date.

I know this is asked many times before but all the answers here are not usefull for me since they return the dotnet weeknumber or the iso 8601 weeknumber.

What I need is a bit more challenging.
Let me explain with sample data that will be the easiest :

input date    desired weeknumber
01-jan-2012          1
02-jan-2012          2
31-dec-2012         52
01-jan-2013          1
06-jan-2013          1
07-jan-2013          2
31-dec-2013         52
01-jan-2014          1
05-jan-2014          1
06-jan-2014          2

I hope this makes clear what I need.
Its like if you would write weeknumbers on a printed calendar but with the first/Last week splitted to 1/52 in stead of 53

Searching in google returns lots of answers like this one example of answer , but none of them I found returns these result so I am hoping someone can help me with this or point me in the right direction.

EDIT : another way to explain it is this :

look at it as you would say to another person, the last day of the year a person would say it is week 52 and the first day of the year a person would say week 1. A person would never say it is week 53.
For 02-jan-2012 a person would say we are in week 2 of this year, not in week 1

EDIT : I finally convinced my employer that this is not practical and even impossible. The answers and comments in this thread is what I used for the convincing so you did all help me well afterall

Answer 1

I'm not sure if I understand your post correctly but maybe this could be a solution:

  var dates = new[]
  {
    new DateTime(2012, 1, 1),
    new DateTime(2012, 1, 2),
    new DateTime(2012, 12, 31),
    new DateTime(2013, 1, 1),
    new DateTime(2013, 1, 6),
    new DateTime(2013, 1, 7),
    new DateTime(2013, 12, 31),
    new DateTime(2014, 1, 1),
    new DateTime(2014, 1, 5),
    new DateTime(2014, 1, 6),
  };

  var calendar = CultureInfo.CurrentCulture.Calendar;

  foreach (var date in dates)
  {
    var day = calendar.GetDayOfYear(date);
    var week = calendar.GetWeekOfYear(date, CalendarWeekRule.FirstDay, DayOfWeek.Monday);
    week = week > 52 ? 52 : week;
    Console.WriteLine($"{date.Date}: {day,3}: {week,3}");
  }

Answer 2

have you tried any codes? and what you say is not making sense , although weeks start on monday , a january 2nd on tuesday does not mean it's the years second week, week number in a year means that you want to know how many weeks have passed, meaning you have to devide the day number by 7. what i mean is that the week number is not dependant on the start of the weekdays , it depends on how many 7-days have passed. for this you have two ways to implement: 1st - first extract the day number from the date and then devide it to 7 to get the week number. 2nd - to create a switch case , and deviding the weeks by dates. although in single cases the 2nd way might prove faster, the 1st ways proves to be easier to make it into code, needless to say both are a little too long, if you don't understand what to do or how to do it comment so i put first few lines of each one's codes.