Making a calendar

[Northern Monkey]

I've created a calendar to add events to but I want to add an option which allows the user to set a recurrence of every third thursday of the month etc. Any ideas on how to do this as at the moment the calendar table just uses the time stamp for the event. I can put an option so that after the event has passed it will change the timestamp but any ideas on how to work out the 3rd Thursday of every month\year etc?

Cheers,

NM.

[esnagel]

PHP Code:

<?php
    //     0 (for Sunday) through 6 (for Saturday)

    function dayOfMonth($nMonth, $nYear, $nWeekday, $nInstance) {
        // First, we need to know what day of the week the first is on
        $nFirstday = date("w", mktime(0, 0, 0, $nMonth, 1, $nYear));

        // Next, figure out the date of the first nWeekday we want
        $nFirstDate = 1;
        while (date("w", mktime(0, 0, 0, $nMonth, $nFirstDate, $nYear)) <> $nWeekday) {
            $nFirstDate++;
        } // ends while (date("w", mktime(0, 0, 0, $nMonth, $nFirstDate, $nYear)) <> $nWeekday)

        // Now, go forward
        $nthDate = $nFirstDate+(7*($nInstance-1));

        return $nthDate;

    } // ends function dayOfMonth($nMonth, $nYear, $nWeekday, $nInstance)

    echo("The 3rd Thursday of October, 2006 is " . dayOfMonth(10, 2006, 4, 3) . "\n");
    echo("The 1st Friday of October, 2006 is " . dayOfMonth(10, 2006, 5, 1) . "\n");
    echo("The 2nd Sunday of December, 2006 is " . dayOfMonth(12, 2006, 0, 2) . "\n");

    // Funny date
    echo("The 8th Saturday of September, 2006 is " . dayOfMonth(9, 2006, 6, 8) . "\n");

    // But if you use that back into date(), it'll work
    echo("The 8th Saturday of September, 2006 is " . date("F j, Y", mktime(0, 0, 0, 9, dayOfMonth(9, 2006, 6, 8), 2006)) . "\n");

?>

Example:

-bash-3.00$ php dayOfMonth.php 
The 3rd Thursday of October, 2006 is 19
The 1st Friday of October, 2006 is 6
The 2nd Sunday of December, 2006 is 10
The 8th Saturday of September, 2006 is 51
The 8th Saturday of September, 2006 is October 21, 2006

[Northern Monkey]

Thanks Eric that's just what I'm looking for!

NM.