How to get the week number from a date?

[MattWoberts]

Hi,

I have a date stored in a C++ tm structure, and I need to work out what the week number is. Weeks always start on a Sunday, so if for example the date 1-jan-2002 was on a tuesday, then week 1 starts on the preceeding Sunday (30-Dec-2001), thus 1-jan-2002 is in week 1, but the 6-jan-2002 is in week 2 etc.

Does anyone know of a good way to calculate the week number automatically?

Many thanks

Matt Roberts

 

[Nosferatu]

Well... Aren't you mistaking?
The weeks are contained in months, which are contained in years, which start in no matter what day...

You generally refer to a week as "week 2 from April" or "50th week of the year".

The first week of the year is the first week of January...

But, that's just a thought, you might have strict specifications on that...

If not, just divide the number of days ellapsed to 7.. [red]Nosferatu[/red]
We are what we eat...
There's no such thing as free meal...
once stated: methane@personal.ro

 

[MattWoberts]

Thanks. Yes, we do have some rules for week numbers here, the first week does not always start on January 1st, but it can start on as odd a date as 28-December of the previous year.

I have discovered a funtion strftime, that does actually format a string in a variety of date formats, including week numbers, so I am hoping to use that to do the work for me