* Thus wrote Chirag Shukla:
>
> This function can be used to know whether it is Daylight Savings time or
> not for the given date. It may not be the most optimized program, but
> may be helpful.
>
> If there is a modified code, please let me know.
ok.
>
> <?php
>
> // here is the date. We wont worry about the time.
> $processdate = "07/04/2004 14:45";
What about different formats like 07-04-2004 14:45:00
>
> // calling the function.
> // 1 means the date is in a daylight savings time
> // 0 means the date is not in a daylight savings time
one thing to note, not all zones, even in the US honor the
DST. this is a rather sepecific function.
> echo daylight($processdate);
>
> // now the function
>
> function daylight($mydate)
> {
> // separating the date and time
> $datetime = explode(" ",$mydate);
>
> // exploding the components of date
> $dateexplode = explode("/",$datetime[0]);
Instead of exploding stuff around, make your date argument compatible
with the strtotime() function, it will return a unix timestamp or
-1 if it fails to parse the date.
>
> // if the date is between Jan-Mar, NO DAYLIGHT
> // if the date is between Nov-Dec, NO DAYLIGHT
> if ($dateexplode[0]<4 or $dateexplode[0]>10)
> {
> return 0;
> }
> // if the date is not in the above zone, lets see
> // if the date is between May-Sep, DAYLIGHT
> elseif ($dateexplode[0]>4 and $dateexplode[0]<10)
> {
> return 1;
> }
Since you have a timestamp as I suggested above, you simply need
to pull the month out, and then check the month value:
$month = strftime('%m', $utimestamp);
swtich ($month) {
case '01': case '02': ...
return 0;
case '05': case '06': ...
return 1;
}
> else
> {
> // we are going to pull out what date is a sunday
> // then we compare our date's day-of-month with the
> day-that-is-sunday
>
> $interestday = 0;
>
> // lets see what happens in april - first sunday of the month
> if ($dateexplode[0]==4)
> {
> // looping the first seven days to see what day is a
> sunday
> for ($i=1; $i<=7; $i++)
> {
> $myday =
>
> date("w",mktime(0,0,0,$dateexplode[0],$i,$dateexplode[2]));
> if ($myday==0)
> $interestday = $i;
> }
>
> // now that we got what day is a sunday, lets see
> // if our date's day-of-month is greater than this
> or not
> // if it is greater, then DAYLIGHT
> if ($dateexplode[1]>=$interestday)
> return 1;
> else
> return 0;
> }
>
> // lets see what happens in october - last sunday of the
> month
> elseif ($dateexplode[0]==10)
> {
> // looping the first seven days to see what day is a
> sunday
> for ($i=25; $i<=31; $i++)
> {
> $myday =
>
> date("w",mktime(0,0,0,$dateexplode[0],$i,$dateexplode[2]));
> if ($myday==0)
> $interestday = $i;
> }
>
> // now that we got what day is a sunday, lets see
> // if our date's day-of-month is greater than this
> or not
> // if it is less, then DAYLIGHT
> if ($dateexplode[1]<=$interestday)
> return 1;
> else
> return 0;
> }
> }
now instead of doing all that mundane work, we simply have to
find out if the days are outabounds for the paticular months.
// obtain the day of month
$dayofmonth = (int)strftime('%d', $utimestamp);
// and the day of week
$dayofweek = strftime('%u', $utimestamp);
if ($month == '04') {
// If its the first week of 04
if ($dayofmonth <= 7) {
// and we havn't reached sunday, return 0
return ($dayofweek < 7) ? 0: 1;
}
return 1; // otherwise we're passed it.
} elseif ($month == '10') {
// look at the last week october
if ($dayofmonth >= 24) {
// see if we're still in the zone.
return ($dayofweek < 7) ? 1: 0;
}
return 1;
}
// something went wrong.
return -2;
> }
Curt
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First, let me assure you that this is not one of those shady pyramid schemes
you've been hearing about. No, sir. Our model is the trapezoid!
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