Howard Atkins
26th January 2009, 09:28 AM
I started getting confused about what week it is.
This arose when I was being asked about my availability for CW (Calendar Week) 07.
I opened MS Outlook and on the calendar there CW 07 was 16-22 February
I looked at my diary and found that CW 07 is the 9-15 February.
I went to ISO 8601,
Data elements and interchange formats — Information interchange —
Representation of dates and times
And found the following:
2.2.10
calendar week number
ordinal number which identifies a calendar week within its calendar year according to the rule that the first calendar week of a year is that one which includes the first Thursday of that year and that the last calendar week of a calendar year is the week immediately preceding the first calendar week of the next calendar year
But in notes to 3.2.2
NOTE 1 A calendar year has 52 or 53 calendar weeks.
NOTE 2 The first calendar week of a calendar year includes up to three days from the previous calendar year; the last calendar week of a calendar year includes up to three days from the following calendar year. Therefore, for certain
calendar days the calendar date contains a different calendar year than the week date. For instance:
— Sunday 1 January 1995 is identified by the calendar date [1995-01-01] and week date [1994-W52-7]
— Tuesday 31 December 1996 is identified by the calendar date [1996-31-12] and week date [1997-W01-2].
NOTE 3 The rule for determining the first calendar week (see the definition of calendar week number in Clause 2) is equivalent with the rule “the first calendar week is the calendar week which includes 4 January”.
BUT :bonk:this year January 1st was a Thursday (2.2.10) and the following week began with 4th January (Note 3)
ISO_week_datefinds it even more complicated
I advise everyone to check their partners diaries.
This arose when I was being asked about my availability for CW (Calendar Week) 07.
I opened MS Outlook and on the calendar there CW 07 was 16-22 February
I looked at my diary and found that CW 07 is the 9-15 February.
I went to ISO 8601,
Data elements and interchange formats — Information interchange —
Representation of dates and times
And found the following:
2.2.10
calendar week number
ordinal number which identifies a calendar week within its calendar year according to the rule that the first calendar week of a year is that one which includes the first Thursday of that year and that the last calendar week of a calendar year is the week immediately preceding the first calendar week of the next calendar year
But in notes to 3.2.2
NOTE 1 A calendar year has 52 or 53 calendar weeks.
NOTE 2 The first calendar week of a calendar year includes up to three days from the previous calendar year; the last calendar week of a calendar year includes up to three days from the following calendar year. Therefore, for certain
calendar days the calendar date contains a different calendar year than the week date. For instance:
— Sunday 1 January 1995 is identified by the calendar date [1995-01-01] and week date [1994-W52-7]
— Tuesday 31 December 1996 is identified by the calendar date [1996-31-12] and week date [1997-W01-2].
NOTE 3 The rule for determining the first calendar week (see the definition of calendar week number in Clause 2) is equivalent with the rule “the first calendar week is the calendar week which includes 4 January”.
BUT :bonk:this year January 1st was a Thursday (2.2.10) and the following week began with 4th January (Note 3)
ISO_week_datefinds it even more complicated
I advise everyone to check their partners diaries.
