I have a script that calculates the number of days since 1/1/00 .
However is there a way to have it give the correct answer when
daylight savings time are in effect? See my code below:


$then = mktime ( 0 , 0, 0, 1,1,'00');
$now = time();

// Comment out for daylight savings time
//$days =  ($now - $then + 3600 ) / 86400  - 1;
$days =  ($now - $then  ) / 86400  - 1;

Mr. Nonsense wrote:
> I have a script that calculates the number of days since 1/1/00 .
> However is there a way to have it give the correct answer when
> daylight savings time are in effect? See my code below:
> 
> 
> $then = mktime ( 0 , 0, 0, 1,1,'00');
> $now = time();
> 
> // Comment out for daylight savings time
> //$days =  ($now - $then + 3600 ) / 86400  - 1;
> $days =  ($now - $then  ) / 86400  - 1;

Assuming DST is not in effect on 1/1/00, check to see if DST is in 
effect now.  If it is, adjust the time by 3600 seconds.

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Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
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>I have a script that calculates the number of days since 1/1/00 .

There is no year 00.  PHP might accept that as an argument to mktime(),
but it's awful as a specification for what the script is supposed to
do.

>However is there a way to have it give the correct answer when
>daylight savings time are in effect? See my code below:
>
>
>$then = mktime ( 0 , 0, 0, 1,1,'00');
>$now = time();
>
>// Comment out for daylight savings time
>//$days =  ($now - $then + 3600 ) / 86400  - 1;
>$days =  ($now - $then  ) / 86400  - 1;

You can use localtime() to figure out if daylight savings time is
in effect for any particular time, using the is_dst value returned.  

>
> Assuming DST is not in effect on 1/1/00, check to see if DST is in
> effect now.

that is the million dollar question. I checked the documentation but
cannot find any built-in function in PHP to check if DST is in effect
or not .

>> Assuming DST is not in effect on 1/1/00, check to see if DST is in
>> effect now.
>
>that is the million dollar question. I checked the documentation but
>cannot find any built-in function in PHP to check if DST is in effect
>or not .

localtime()

Gordon Burditt wrote:
>> I have a script that calculates the number of days since 1/1/00 .
> 
> There is no year 00.  PHP might accept that as an argument to mktime(),
> but it's awful as a specification for what the script is supposed to
> do.
> 
>> However is there a way to have it give the correct answer when
>> daylight savings time are in effect? See my code below:
>>
>>
>> $then = mktime ( 0 , 0, 0, 1,1,'00');
>> $now = time();
>>
>> // Comment out for daylight savings time
>> //$days =  ($now - $then + 3600 ) / 86400  - 1;
>> $days =  ($now - $then  ) / 86400  - 1;
> 
> You can use localtime() to figure out if daylight savings time is
> in effect for any particular time, using the is_dst value returned.  
> 

date('I') will also identify whether DST is in effect or not.

-- 
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
==================

Mr. Nonsense escribi�:
> I have a script that calculates the number of days since 1/1/00 .
> However is there a way to have it give the correct answer when
> daylight savings time are in effect? See my code below:
> 
> 
> $then = mktime ( 0 , 0, 0, 1,1,'00');
> $now = time();
> 
> // Comment out for daylight savings time
> //$days =  ($now - $then + 3600 ) / 86400  - 1;
> $days =  ($now - $then  ) / 86400  - 1;

A quick trick is to create your timestamp at 12:00 rather than 00:00.

(Year zero??)


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