note 29089 added to function.date

We have meetings once a month. For instance, one might be on the third Thursday of each month ... or the first Monday, etc. I wanted a function to return the date of next month's meeting given the date of this month's meeting. Here are a couple of functions that do that: <h1>Find the next meeting date</h1> <? /* Convert date in YYYYMMDD format to unix format */ function date_to_epoch ( $d ) { return mktime ( 3, 0, 0, substr ( $d, 4, 2 ), substr ( $d, 6, 2 ), substr ( $d, 0, 4 ) ); } /* Find the next meeting day, assuming you want to meet one month later on the same day of the week and the same week of the month. */ function next_month($d) { // Find where we are in the month $day_of_week = date("w", $d); $week_of_month = ceil(date("d", $d)/7); // Find first day of next month $d2 = date_to_epoch ( date("Ymd", mktime (0,0,0,date("m",$d)+1,1,date("Y",$d)))); // Find week adjustment factor $day_of_week2 = date("w", $d2); $week_adjustment = $week_of_month; if ($day_of_week >= $day_of_week2) { $week_adjustment -= 1; } // Find day adjustment factor $day_adjustment = $day_of_week - $day_of_week2; // Find the target day $dy2 = (($week_adjustment) * 7) + $day_adjustment + 1; // Get month and year to assemble new date variable to return $mo2 = date("m", $d2); $yr2 = date("Y", $d2); // Show calendar to enable a visual check of this function // $cal = shell_exec("cal -3 $mo2 $yr2"); // echo "<pre>$cal</pre>"; // Return date in YYYYMMDD format return date("Ymd", mktime (0,0,0,$mo2,$dy2,$yr2)); } /* Main rountine */ if ($start_date) { echo "Current Meeting is: $start_date<br/>\n"; $start = date_to_epoch($start_date); $next_meeting = next_month($start); echo "Next Meeting is: $next_meeting<br/>\n"; } ?> <p></p> <form action=<?=$PHP_SELF?> method="get"> <input type="text" name="start_date"\ value="<?=$next_meeting?>"> Format = YYYYMMDD<br/> <input type="submit" name="submit" value="Submit"\> </form> -- http://www.php.net/manual/en/function.date.php http://master.php.net/manage/user-notes.php?action=edit+29089 http://master.php.net/manage/user-notes.php?action=delete+29089 http://master.php.net/manage/user-notes.php?action=reject+29089