Re: [PHP] Some date() oddities
On 9.1.2013 12:22, Arno Kuhl wrote: Both %U and %W seem to return what you want, using strftime. I'd guess that date would also have flags for these. No. That's one thing I've wondered sometimes. According to documentation: strftime has: Week--- --- %U Week number of the given year, starting with the first Sunday as the first week 13 (for the 13th full week of the year) %V ISO-8601:1988 week number of the given year, starting with the first week of the year with at least 4 weekdays, with Monday being the start of the week 01 through 53 (where 53 accounts for an overlapping week) %W A numeric representation of the week of the year, starting with the first Monday as the first week 46 (for the 46th week of the year beginning with a Monday) date has: Week--- --- W ISO-8601 week number of year, weeks starting on Monday (added in PHP 4.1.0) Example: 42 (the 42nd week in the year) Also then ISO-8601 week number is kind of mixed, or is older iso week something different than in 1988 version of the standard= By description they both %W and W do the same, but other one is ISO-8601 and in strftime ISO-8601:1988 is %V which is different. Or is it so that strftime %V is same as date's W, both are really the iso week's but description for date forgets to mention about that "at least 4 weekdays". So at least someone could fix the documentation to be exact to one don't have to guess or rtfs. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
RE: [PHP] Some date() oddities
On Tue, 8 Jan 2013, Arno Kuhl wrote:
> Starting with a unix timestamp for 31 December 2012 13:12:12 (which is
> 1356952332) I calculate a week number:
>
> $ux_date = 1356952332;
>
> $weeknumber = date("W", $ux_date); // returns 01 instead of 52
I'm not that familiar with date, I tend to use strftime myself (no idea why
there's both). Sounds like date's W is equivalent to strftime's %V which
does indeed return "01" for this date as there's at least 4 days of the new
year in that particular week.
Both %U and %W seem to return what you want, using strftime. I'd guess that
date would also have flags for these.
Cheers,
Geoff.
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Thanks Geoff, that's what I was looking for.
Cheers
Arno
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Re: [PHP] Some date() oddities
On Tue, 8 Jan 2013, Arno Kuhl wrote:
Starting with a unix timestamp for 31 December 2012 13:12:12 (which is
1356952332) I calculate a week number:
$ux_date = 1356952332;
$weeknumber = date("W", $ux_date); // returns 01 instead of 52
I'm not that familiar with date, I tend to use strftime myself (no idea
why there's both). Sounds like date's W is equivalent to strftime's %V
which does indeed return "01" for this date as there's at least 4 days of
the new year in that particular week.
Both %U and %W seem to return what you want, using strftime. I'd guess
that date would also have flags for these.
Cheers,
Geoff.
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Re: [PHP] Some date() oddities
Hi,
Workaround for what? The 31st of december is the first week of the
ISO8601-year 2013. That has nothing to do with PHP, date(), or any warnings
somebody left in the comments. Thats the way ISO8601 is defined:
http://en.wikipedia.org/wiki/ISO_8601#Week_dates
Regards,
Sebastian
2013/1/8 Arno Kuhl
> I've bumped into an odd result with the date() function that I can't make
> sense of.
>
>
>
> Starting with a unix timestamp for 31 December 2012 13:12:12 (which is
> 1356952332) I calculate a week number:
>
> $ux_date = 1356952332;
>
> $weeknumber = date("W", $ux_date); // returns 01 instead of 52
>
>
>
> I found some warnings regarding ISO8601 for this in the user notes for the
> date() function in the PHP manual but couldn't see how this is managed in
> code, does anyone know of a workaround for this?
>
>
>
> Cheers
>
> Arno
>
>
>
>
>
>
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github.com/KingCrunch
Re: [PHP] Some date() oddities
On Tue, Jan 8, 2013 at 3:43 PM, Arno Kuhl wrote:
> I've bumped into an odd result with the date() function that I can't make
> sense of.
>
> Starting with a unix timestamp for 31 December 2012 13:12:12 (which is
> 1356952332) I calculate a week number:
>
> $ux_date = 1356952332;
>
> $weeknumber = date("W", $ux_date); // returns 01 instead of 52
Because, technically, 31 December was the second date of the
*fifty-third* week of 2012. However, because the majority of the week
falls in 2013, it's rounded-in with that.
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