date/mktime for next week?

oMIKEo · 04-23-2008, 01:55 PM

Hi,

I'm trying to work out an easy way to calculate the date for next week based on the current date.

im using

PHP Code:


			
$varOne= mktime(0, 0, 0, date("m")  , date("d"), date("Y"));

$varTwo=  date('Y-m-d', $varOne);

What i want is to know the date for next Mon, Tue, Wed, etc.

So if its Monday today i need to know the current date + 7, if its Tuesday i need to know current date +8, etc.

is there an easy way without a load of IF statments?

Thanks,
Mike

Village Idiot · 04-23-2008, 01:59 PM

Quote:

Originally Posted by oMIKEo

Hi,

I'm trying to work out an easy way to calculate the date for next week based on the current date.

im using

PHP Code:


			
$varOne= mktime(0, 0, 0, date("m")  , date("d"), date("Y"));
$varTwo=  date('Y-m-d', $varOne);

What i want is to know the date for next Mon, Tue, Wed, etc.

So if its Monday today i need to know the current date + 7, if its Tuesday i need to know current date +8, etc.

is there an easy way without a load of IF statments?

Thanks,
Mike

Using date()

PHP Code:


			
//I dont remember the date output codes, you will have to look them up.
$next_week = date("Y-m-d",time()+(60*60*24*7));

Now that you have the date of next week from now, you can calculate the rest yourself

oMIKEo · 04-23-2008, 02:11 PM

Ive got it working but its a bit long winded:

PHP Code:


			
<?php



$myCurrentDayIs = date("D");



if($myCurrentDayIs == "Mon")

{

    $day_for_mon = date("Y-m-d",time()+(60*60*24*7));  

    $day_for_tue = date("Y-m-d",time()+(60*60*24*8));

    $day_for_wed = date("Y-m-d",time()+(60*60*24*9));

    $day_for_thu = date("Y-m-d",time()+(60*60*24*10));

    $day_for_fri = date("Y-m-d",time()+(60*60*24*11));

}



if($myCurrentDayIs == "Tue")

{

    $day_for_mon = date("Y-m-d",time()+(60*60*24*6));  

    $day_for_tue = date("Y-m-d",time()+(60*60*24*7));

    $day_for_wed = date("Y-m-d",time()+(60*60*24*8));

    $day_for_thu = date("Y-m-d",time()+(60*60*24*9));

    $day_for_fri = date("Y-m-d",time()+(60*60*24*10));

}



if($myCurrentDayIs == "Wed")

{

    $day_for_mon = date("Y-m-d",time()+(60*60*24*5));  

    $day_for_tue = date("Y-m-d",time()+(60*60*24*6));

    $day_for_wed = date("Y-m-d",time()+(60*60*24*7));

    $day_for_thu = date("Y-m-d",time()+(60*60*24*8));

    $day_for_fri = date("Y-m-d",time()+(60*60*24*9));

}



if($myCurrentDayIs == "Thu")

{

    $day_for_mon = date("Y-m-d",time()+(60*60*24*4));  

    $day_for_tue = date("Y-m-d",time()+(60*60*24*5));

    $day_for_wed = date("Y-m-d",time()+(60*60*24*6));

    $day_for_thu = date("Y-m-d",time()+(60*60*24*7));

    $day_for_fri = date("Y-m-d",time()+(60*60*24*8));

}



if($myCurrentDayIs == "Fri")

{

    $day_for_mon = date("Y-m-d",time()+(60*60*24*3));  

    $day_for_tue = date("Y-m-d",time()+(60*60*24*4));

    $day_for_wed = date("Y-m-d",time()+(60*60*24*5));

    $day_for_thu = date("Y-m-d",time()+(60*60*24*6));

    $day_for_fri = date("Y-m-d",time()+(60*60*24*7));

}



echo "$day_for_mon<br />$day_for_tue<br />$day_for_wed<br />$day_for_thu<br />$day_for_fri";



?>

Village Idiot · 04-23-2008, 02:53 PM

I have a better way, I'll post it when I'm home and can debug it.

sjaq · 04-23-2008, 03:36 PM

why not just use strtotime?

PHP Code:


			
$date = strtotime('+1 week');

Orc · 04-23-2008, 06:34 PM

Quote:

Originally Posted by sjaq

why not just use strtotime?

PHP Code:


			
$date = strtotime('+1 week');

That's pretty much what I was going to be put.

Village Idiot · 04-23-2008, 08:31 PM

Thing is, he needs to know the dates of every day next week and has to be able to access them by day (monday, tuesday, ect). Those functions only say what next weeks today's date will be.

This will give you the dates of all the days next week, for a week.

PHP Code:


			
<?php
//get todays ISO-8601 numeric represenation of the date
$Today = date("N");
$DayNames = array(1=>"Monday",2=>"Tuesday",3=>"Wednesday",4=>"Thursday",5=>"Friday",6=>"Saturday",7=>"Sunday");
$Days = array();

$DayOffset = 0;
//generate all the days
for($i=0;$i<7;$i++)
{
    if($DayOffset > 7-$Today)
    {
        $DayOffset = -($Today-1);
    }
    $Days[$DayNames[$Today+$DayOffset]] = date("Y-m-d",time()+(60*60*24*(7+$DayOffset)));
    $DayOffset++;
}

echo $Days["Monday"] . "<br />";
echo $Days["Tuesday"] . "<br />";
echo $Days["Wednesday"] . "<br />";
echo $Days["Thursday"] . "<br />";
echo $Days["Friday"] . "<br />";
echo $Days["Saturday"] . "<br />";
echo $Days["Sunday"] . "<br />";
?>

As of 4/23/08, it outputs
2008-04-28
2008-04-29
2008-04-30
2008-05-01
2008-05-02
2008-05-03
2008-05-04

Salathe · 04-23-2008, 11:30 PM

How about an alternative approach:

Provide start date
Find the following Monday
Loop through next n days for display

In PHP that might look something like:

PHP Code:


			
<?php header('Content-Type: text/plain');



// Create timestamp from start date (use: "now" [or time() function] for current date/time )

$date = strtotime('23 April 2008');



// Move date to coming monday 

$date = strtotime(sprintf('+%d day', 8 - date('N', $date)), $date);



// Write out the week's worth of dates

for ($days = 7; $days > 0; $date = strtotime('+1 day', $date), $days--)

{

    echo date('D jS M Y', $date), "\n";

}

However, that global $date variable floating around doesn't help us to see what's going on. If only there was some OO way to do the same thing which encapsulated the date.

PHP Code:


			
<?php header('Content-Type: text/plain');



// Create DateTime object from start date (use: "now" [or no arguments] for current date/time)

$date = new DateTime('23 April 2008');



// Move date to coming monday

$date->modify(sprintf('+%d day', 8 - $date->format('N')));



// Write out the week's worth of dates

for ($days = 7; $days > 0; $date->modify('+1 day'), $days--)

{

    echo $date->format('D jS M Y'), "\n";

}

Both strtotime and DateTime snippets output the same result:



Mon 28th Apr 2008

Tue 29th Apr 2008

Wed 30th Apr 2008

Thu 1st May 2008

Fri 2nd May 2008

Sat 3rd May 2008

Sun 4th May 2008

If it's not clear how/why I've done things the way that I have, please do ask! Either I, or someone quicker than me, can clear up any confusion.

P.S. The way I've written the for loops might seem a bit weird. Feel free to write them in a more 'normal' manner yourself.