Monday, 13/09/2021, to Sunday, 19/09/2021
In offices all around the world, everybody's talking about a mysterious calendar week, a.k.a. CW. However, ordinary human beings have a slight bit of a problem with that: How the hell should we know the current calendar week? week-number.org wants to help this marginalised species in British offices: Here you can find the current calendar week (CW) for free and fresh every week.
One year has 52 weeks and therefore 52 calendar weeks (sometimes called week number), right? Unfortunately it's not that simple. Like everything in life, there's more behind it. Why should it be easy if it can be complicated? But, first things first!
It doesn't matter whether a year has 52 weeks or 53 weeks: The first calendar week of the year is always the week of the 4th of January, or the week of the first Thursday of the year. A calendar week always begins on Monday and ends on Sunday, according to ISO 8601 (believe it or not, that really exists!)
Usually there are 52 calendar weeks per calendar year. However, under certain circumstances there can be 53 calendar weeks. Namely, when the year starts on a Thursday, or when the year is a leap year and New Year's Day is a Wednesday.
Most printed calendars show the calendar week in the small print. One of the best calendars is probably Moleskine Large Weekly Notebook, which - of course - shows you the number of each week.
It's also very simple to display week numbers in digital calendars:
In Outlook 2010, the option to show week numbers can be found under "File" » "Options" » "Calendar" » "Show week numbers in the month view and in the Date Navigator".
To display calendar weeks in the Mac OS X calendar, go to "Calender" » "Preferences" » "Advanced" » "Show week numbers" (► Video tutorial).
Thunderbird is so smart that it automatically shows the current calender week. If that's not the case, you can download a week numbers as an add-on for Thunderbird from here.