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Focal Point    Focal Point Forums  Hop To Forum Categories  WebFOCUS/FOCUS Forum on Focal Point     week number is not giving me the right number

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week number is not giving me the right number
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vnf
Silver Member
posted
Hello,

I am trying to get the week number for a particular date field but I am not getting the right week for jan 01.
for example, 20150101 the week number should be 1 but it is returning 52.
20160101 the week number should be 1 but it is returning 52.
any other days seems to be fine.

calendar_yywk = CAL_YEAR * 100 +HPART(HDTTM( FULL_DATE,8,'HYYMDIA'),'WEEK', 'I2')---> for 20150101 is returning 201552, 20160101 returning 201652
where CAL_YEAR I4 is DATE_INT / 10000, FULL_DATE is the date in YYMD format and DATE_INT is the FULL_DATE in integer format.

Does anyone knows how to solve this?


thanks,

V

This message has been edited. Last edited by: vnf,


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Posts: 43 | Registered: September 30, 2015Report This Post
Francis Mariani
Expert
posted Hide Post
Do a Google search for 'week numbers for 2015' and you will find



The first days of a year are generally included in the last days of the previous year.


Francis


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Posts: 10577 | Location: Toronto, Ontario, Canada | Registered: April 27, 2005Report This Post
Wep5622
Virtuoso
posted Hide Post
The behaviour is correct. What's more of a challenge is to get the correct year printed with that week number at the start or end of a year.

Several RDBMS's provide a separate variant of a to_char pattern to extract the year for use with a week number.
For example, to_char(CURRENT_DATE, 'IYYY/IW') gives the ISO-8601 year/week, which results in year 2014 for week 53, regardless of whether we're looking at 2014/12/31 or at 2015/01/01.

In contrast, to_char(CURRENT_DATE, 'YYYY/IW'), which gives the calendar year with the week (for week 53 in 2014, that incorrectly gives 2015 for 2015/01/01)


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Posts: 1669 | Location: Enschede, Netherlands | Registered: August 12, 2010Report This Post
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