PHP - Datetime Loses An Hour

Hello,

I have a very simple table... DAY (Y-m-d) / TIME (00:00:00) / POWER (INT)

I am using a Jquery datepicker to select the date on the page, and that POST to the PHP file.

I am trying to select values from Mysql to make 3 HighCharts Graphs using the selected day of the datepicker. I have started with the DAY graph PHP to get the values for each hour of a 24 hour day. I need to get the values for each hour... 23,12,15,35 etc... , and then I need for the 31 days of a month for the month graph, and 12 months of the year for the month graph all in the same way so the HighCharts can use the values to make the chart (3 php files, one for each graph)

Here is the PHP I have for the 1 day that should get the 24 individual hour data, but it does not seem to work...

<?php
$choice = (isset($_POST['choice'])) ? date("Y-m-d",strtotime($_POST['choice'])) : date("Y-m-d"); 
$con = mysql_connect("localhost","root","mackie1604");  
if (!$con)  {  
die('Could not connect: ' . mysql_error());  
}  
mysql_select_db("inverters", $con);  
$sql = "SELECT HOUR(time), COUNT(power) FROM feed WHERE time = '".$choice."' GROUP BY HOUR(time) ORDER BY HOUR(time) "; 
$res = mysql_query($sql) or die('sql='.$sql."\n".mysql_error()); 
$row = mysql_fetch_assoc($res); 
echo $row['choice'].'<br />'; 
?>

What have a written wrong in the sql query ???

Alan

So I am trying to check if the current time is one hour before a variable time:
Code: [Select]
$date_game=$dt->format('Y n j'.$pieces[2]);
echo $date_game;
echo date('Y n j H');

if (date('Y n j H') < $date_game)  {
echo "The time is before the stored time";
}

This displays
2012 1 21 17:30
2012 1 21 16
i.e $pieces[2] = 17:30. and $dt formatted Y n j = 2012 1 21.
The current Y n j H is 2012 1 21 16.
I want to know if it is more than one hour until the date/time stored in $date_game.

At the moment it just tells me that it is before that time.
Can I do something like
Code: [Select]
$data_game - 1->format('H');
or something?
Thanks guys

Hi guys,

I have a PHP Script were user would enter a username and password to get access, but the problem I keep having is every half n hour or so user have to sign in again cause the keeps logging them out for some reason.

Please I need your help and advice to make this stop.

Hi,   I have a blog which records the amount of views on each article. I now want to be able to work out the average number of views per hour.   How can I work out the number of hours passed from a datetime format?   From there I can just do views divided by hours passed.   Thanks in advance!    

Hello,

I am trying to load an external image from a NOAA site directory. This image refreshes every three hours, starting with 0 and then 3,6,9,12.....21 in a 24 hour calendar, and are stored for days in advance. The date/time is in the file name. Originally I had written the script to refresh on the hour, and then realized the tri-hourly spacing. This is what I have:

Code: [Select]
<?php
date_default_timezone_set('Etc/GMT-1');
$today = date("YmdH");
$pattern = '/WaveHeight_'.$today.'_mic.png';
$base_url = 'http://www.crh.noaa.gov/images/greatlakes/ndfd/MIC/dynamic2';
print '<a href="http://www.crh.noaa.gov/greatlakes/?c=map&l=lm&p=a"><img src="'.$base_url.$pattern.'" width= "237" hieght= "314" " ></a>';
?>

I am not fluent in php, but I assume I need a "If H=1,4,7,10,13,16,19,22; Then H+2 ; along with If H=2,5,8,11,14,17,20,23; Then H+1" to keep the images relatively current. I just can't quite wrap my head around how to express this.

Any help is appreciated.

Thank you.

Hi

I want to make something like this -

My Sites index.php will be avail avail to user after he has clicked in a link that will come after every 24 Hour in my site. Means when a user first enters the site it will come and clicking in there the site will be avail avail. again after 24 Hour it will come again.

But i am not getting how to do it.

So need help

SaKIB

Hi,

I am creating a date string using the following:

$curDate = date("Y-m-d H:i:s");

However, what I want to do is take one hour off this so that $curDate now becomes the current date and time minus one hour.

Thanks for your help.

My site allows users to vote once per hour, and it checks the next time they vote if it's been 3600 seconds  (1 hour) since their last vote. But, it always returns the value 0.

$grab = mysql_fetch_assoc($has_voted);

$calc = strtotime($grab['date']) - strtotime(date("M-d-Y"));

if($calc > 3600)

{

mysql_query("DELETE FROM votes WHERE ip = '". $_SERVER['REMOTE_ADDR'] ."'");

header("location:votes.php?id=". $id ."");

}

else

{

echo 

echo "You've voted within the last hour. Please wait ". $calc ." seconds.";

}

I insert a time value using the following code     $ti= ( !empty($_POST['time']) ) ? "'{$_POST['time']}'" : 'NULL';    I want to insert a second time value into a differen column which would be the same time minus 1 hour   something along the lines of :   $ti2= ( !empty($_POST['time']) ) ? "'{$_POST['time'] -1 hour}'" : 'NULL';    What would be the correct way to do it

This topic has been moved to PHP Freelancing.

http://www.phpfreaks.com/forums/index.php?topic=332844.0

Hey guys only thing i can find online is examples of showing how much time is left until a predetermind time.

but what I need is how many minutes are left until the next hour hits

anyone have any ideas on this? Im wanting to do it in UNIX time

When I echo the current time, the hour is what it is plus one:

echo date("h:i:s:A");


Real time is 3:46:33

Would display 4:46:33


What is wrong here?

Hello,

Im trying to work out some code.  On my site between Thursday 12th July and Sunday 15th July between the hours of 22:00 and 23:00 I want to display some code.  I've done this so far, but am having trouble. Anyone please help?



$the_date = date("H:i:s"); 
$timesep = explode(":",$the_date); // 
$hour = $timesep[0]; 

if (($the_date > 2010-08-12  && < 2010-08-15) && ($hour >= 22) && ($hour <= 23)) {
//Code
}

Unfortunately I do not know how to go about doing this in php any simple examples of time and date will be great.


So what I am trying to do is, display to minutes until the next half hour as well as the seconds until the next minute.  Eg.
Code: [Select]
<?php echo $minutes; ?>:<?php echo $seconds; ?>

Any help using the time and or date functions in this case will be great.

Thank you for your stupendous help.
Brian

This topic has been moved to JavaScript Help.

http://www.phpfreaks.com/forums/index.php?topic=319719.0