think tank forum

i'm coding a special dst feature for u.s. residents.

does anyone here outside of the u.s. use daylight saving time?

me

aye, but saving without the latter s

k, i'll add canada and norway.

p.s. i just made this :D

why do you bother with time zones and dst if all the times and dates displayed are relative?

hold your cursor over the relative times.

aaaahhh

ok, i have these dst schemes:
* null
* usa
* canada
* europe


anyone want anything else? :)

antarctica!

btw, i know that i fucked up the transition hour/min/sec. i gotta figure that out better. :/

damnit, i have to have a different array for each u.s./canada timezone, because they all change their clocks at different times.

europe wins because all of europe changes their clocks at the same time.

p.s. i hate timezones. grr

ok, ttf now has these dst schemes:
* na_pdt
* na_mdt
* na_cdt
* na_edt
* europe

anyone want anything else?

ok, it's up and working.

finally, all ttf times are perfectly in accord with dst. :D

btw, you gotta pick a scheme

ttf's auto-dst is not dependent on php 5. but it does require that you code the schemes you want to offer and build a cache. hovever, i've tried to make coding the schemes pretty easy. here is the one for europe:

// EUROPE DST SCHEME
$ttf_dst['eu'] = array();
// 1998 to now  --- last sunday in march until last sunday in october     --- +1 hour @ 01:00:00 UTC
for ($year = $ttf_epoch_year; $year <= $dst_end_year; $year++) {
    $ttf_dst['eu'][$year] = array('begin' => ttf_conceptual_date(0, 0,  3, $year, 1),
                                  'end'   => ttf_conceptual_date(0, 0, 10, $year, 1),
                                  'adj'   => 1*60*60);
};

auto-dst is not offered by either fluxbb nor wordpress. but historically they've been slow adopters, such as adoption of utf-8.

i'll explain the ttf_conceptual_date() function too. it's converts a phrase such as "the last sunday in march" into a unix timestamp.

ttf_conceptual_date($ordinal, $day_of_week, $month, $year, $h=0, $m=0, $s=0)

$ordinal -- set to 0 for last, 1 for first, 2 for second, 3 for third, 4 for fourth.
$day_of_week -- set to 0 for sun, 1 for mon, 2 for tues, ... , 6 for sat
$month -- set to 1 for jan, 2 for feb, 3 for mar, ... , 12 for dec
$year -- set to four-digit year
$h -- utc hour when to adjust
$m -- utc minute when to adjust
$s-- utc second when to adjust

for example, europe adds 1 hour at 1 a.m. (utc) on the last sunday of march. so for the year 2009, this transition time is at:
ttf_conceptual_date(0, 0, 3, 2009, 1, 0, 0)

if you can't tell, i'm pretty excited about this stuff. ultimately there will be an admin page that will allow addition of dst schemes and re-generate the cache.

and a new project was born. :k

lucas is dst's bitch :)

unfortunately. :(

i added alaska, atlantic, and mexico's three zones.

dst currently supported:
europe
na_akdt
na_pdt
na_mdt
na_cdt
na_edt
na_adt
na_mx3
na_mx2
na_mx1

so now there's complete support for north america.