PHP/String/strtotime

Calculating a date interval with strtotime()

   <source lang="html4strict">

<?php $birthday = "March 10, 2010"; $whoopee_made = strtotime("$birthday - 9 months ago"); ?>

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Checking a date range

   <source lang="html4strict">

<? // Get the epoch timestamp for 6 months ago $range_start = strtotime("6 months ago"); // Get the epoch timestamp for right now $range_end = time(); $submitted_date = strtotime($_POST["yr"] . "-" .

                           $_POST["mo"] . "-" . 
                           $_POST["dy"]);

if (($range_start > $submitted_date) || ($range_end < $submitted_date)) {

   $errors[] = "Please choose a date less than six months old.";

} ?>

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Finding the Date for a Weekday

   <source lang="html4strict">

<?php

 echo "Today is " . date("d M Y") . ".";
 
 for($i = 1; $i <= 12; $i++)
 {
   $nextmonth = date("Y-" . (date("n") + $i) . "-01");
   $nextmonth_ts = strtotime($nextmonth);
   $firsttue_ts = strtotime("Tuesday", $nextmonth_ts);
   
   echo "
The first Tuesday of " . date("F", $firsttue_ts) 
     . " is " . date("d M Y", $firsttue_ts) . ".";
 }

?>

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Find the First monday on or after November 1, 2008

   <source lang="html4strict">

<? $monday = strtotime("Monday", $november); ?>

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Find weekday

   <source lang="html4strict">

<?php

 function find_weekday($month, $year, $weekday, $offset=1)
 {
   $month_ts = strtotime("$year-$month-01");
   if(--$offset > 0)
     $month_ts = strtotime("+$offset week", $month_ts);
   $month_ts = strtotime($weekday, $month_ts);
   return $month_ts;
 }
 echo date("d M Y", find_weekday(5, 2000, "Friday")) . "
";
 echo date("d M Y", find_weekday(5, 2000, "Friday", 1)) . "
";
 echo date("d M Y", find_weekday(5, 2000, "Fri", 2)) . "
";
 echo date("d M Y", find_weekday(5, 2000, "Friday", 3)) . "
";
 echo date("d M Y", find_weekday(5, 2000, "Friday", 4));

?>

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Getting the Day and Week of the Year

   <source lang="html4strict">

<?php $mydates = array("2010-01-01", "2010-06-30", "2010-12-31"); foreach($mydates as $mydate) {

   $ts = strtotime($mydate); 
   echo "Day " . date("d M Y: z", $ts) . "
\n"; 

} ?>

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If PHP is unable to convert your string into a timestamp, it will return -1.

   <source lang="html4strict">

<?

   $mydate = strtotime("Christmas 1979");
   if ($mydate == -1) {
           print "Date conversion failed!";
   } else {
           print "Date conversion succeeded!";
   }

?>

 </source>
   
  

int strtotime ( string time [, int now] ) converts strings to a timestamp

   <source lang="html4strict">

<?

   print strtotime("22nd December 1979");
   print strtotime("22 Dec. 1979 17:30");
   print strtotime("1979/12/22");

?>

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Obtaining the Difference Between Two Dates

   <source lang="html4strict">

<?php

 $date1 = "14 Jun 2002";
 $date2 = "05 Feb 2006";
 $ts1 = strtotime($date1);
 $ts2 = strtotime($date2);

printf("

The difference between %s and %s is %d seconds.<p>\n", $date1, $date2, $ts2 - $ts1); ?> </source>

Subtracts a year from a given timestamp

   <source lang="html4strict">

<?

   print strtotime("1 year ago", 123456789);

?>

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Using strtotime()

   <source lang="html4strict">

<? $now = time(); $later = strtotime("Thursday",$now); $before = strtotime("last thursday",$now); print strftime("now: %c \n", $now); print strftime("later: %c \n", $later); print strftime("before: %c \n", $before); ?>

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Using strtotime() with a starting epoch timestamp

   <source lang="html4strict">

<? $november = mktime(0,0,0,11,1,2008); ?>

</source>