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I have Googled a lot and found a lot of solutions, but none of them give me the correct week number for the Even the example on MSDN link fails. Here are some of the methods, that I have tried:. The following method actually returns 1 when date is In other words, my problem was that my methods were not following the ISO standard.
Net week numbering. Net ". Simply put,. Net allow weeks to be split across years while the ISO standard does not. In the article there is also a simple function to get the correct ISO week number for the last week of the year. Update The following method actually returns 1 for which is correct in ISO e. There can be more than 52 weeks in a year. They make up for a 53th week. So for each year you have at least one an extra day.
Two for leap years. Are these extra days counted as separate weeks of their own? How many weeks there are really depends on the starting day of your week.
Let's consider this for It's even possible to have a 54th week. Happens every 28 years when the 1st of January and the 31st of December are treated as separate weeks.
It must be a leap year too. For example, the year had 54 weeks. January 1st sat was the first one week day, and 31st December sun was the second one week day.
Let's keep the start day on Monday since we are dealing with Germany. Good news! A pull request adding System. ISOWeek to. NET Core was just merged and is currently slated for the 3. Hopefully it will propagate to the other. NET platforms in a not-too-distant future. The type has the following signature, which should cover most ISO week needs:. You can find the source code here.
NET Standard. Since there doesn't seem to be a. Net-culture that yields the correct ISO week number, I'd rather bypass the built-in week determination altogether, and do the calculation manually, instead of attempting to correct a partially correct result.
First of all, int date. AddDays - int date. If you divide the zero based day-number within the year by seven round down , you get the zero based week number in the year. NET 3. GetWeekOfDate -Method. Ask this: the how-many-eth thursday of the year is the thursday of this week.
The answer equals the wanted week number. It works well both for US and Russian cultures. The question is: How do you define if a week is in or in ? Your supposition, I guess, is that since 6 days of the week are in , this week should be marked as the first week of Not sure if this is the right way to go. That week started on On monday 31th Dec , so it should be marked as the last week of , therefore it should be the 53rd of The first week of should start on monday the 7th.
Now, you can handle the particular case of edge weeks first and last week of the year using the day of week information. It all depends on your logic. Learn more. Get the correct week number of a given date Ask Question. Asked 7 years, 11 months ago. Active 14 days ago. Viewed k times. Calendar; return cal. GetWeekOfYear date, dfi. CalendarWeekRule, dfi. Monday ; return weekNum; Update The following method actually returns 1 when date is Stefano Altieri 4, 1 1 gold badge 17 17 silver badges 36 36 bronze badges.
Amberlamps Amberlamps How is week 1 at the end of the year? I mean, I see where you get it. But 53 makes sense to me. In my code snippets I get the CultureInfo and stuff. I thought my program knows by then what calender I am using. Active Oldest Votes. Net " Simply put,. Callum Watkins 2, 2 2 gold badges 22 22 silver badges 39 39 bronze badges. Do i replace all "Monday" with "Sunday"??
Monday ;" works just fine. Net , you could find the answer to your question directly from Microsoft. I've manually verified this to be correct for years to assuming that epochconverter. We should all rejoice this year that week 1 of actually started on the first of January for once! This results in a total of 53 weeks.
Check your current Culture's settings to see what it uses as the first day of the week. As you see it's normal to get 53 as a result. Ask the week number for the 1st of January and you'll get back 52 as it is considered part of last's week. FirstDay, DayOfWeek. Year; Console. So week 53 starts on monday , lasts one day and then stops. Change the Culture to germany if want to to try it. GetCultureInfo "de-DE" ;. Prashant Yadav 1 1 gold badge 5 5 silver badges 18 18 bronze badges.
Christophe Geers Christophe Geers 7, 3 3 gold badges 28 28 silver badges 43 43 bronze badges. I know that it is possible that there are 53 weeks.
I have never seen a 54th week! Certain fiscal software packages do have them. Okay, I found out that it is possible in US calenders, but it will not happen in german calenders.
Now, CalendarWeekRule. Monday, however it is a little bit different. Specifically ISO always has 7 day weeks. The type has the following signature, which should cover most ISO week needs: namespace System. Any idea when v 3. NET Core 3 later this year and the final version in Instead of getting week 33 I would like to see Week 2 because week 33 is week 2 in august.
AddDays 3 - date.
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Keep in touch and stay productive with Teams and Microsoft , even when you're working remotely. Returns the week number of a specific date. For example, the week containing January 1 is the first week of the year, and is numbered week 1. There are two systems used for this function:. This system is the methodology specified in ISO , which is commonly known as the European week numbering system.
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He was led as a Lamb to the slaughter, and as a sheep before its shearers is silent, He did not open His mouth. Great kings have used it including David and Solomon and their descendants. Starting yesterday I started receiving this post on my Windows Live You should be able to upgrade to with no particular problem; it should install seamlessly over your current version.
Calendar for Year 2020 (Norway)