<?php
// two-level sort for timezones.
if(! function_exists('timezone_cmp')) {
function timezone_cmp($a, $b) {
if(strstr($a,'/') && strstr($b,'/')) {
if ($a == $b) return 0;
return ($a < $b) ? -1 : 1;
}
if(strstr($a,'/')) return -1;
if(strstr($b,'/')) return 1;
if ( t($a) == t($b)) return 0;
return ( t($a) < t($b)) ? -1 : 1;
}}
// emit a timezone selector grouped (primarily) by continent
if(! function_exists('select_timezone')) {
function select_timezone($current = 'America/Los_Angeles') {
$timezone_identifiers = DateTimeZone::listIdentifiers();
$o ='<select id="timezone_select" name="timezone">';
usort($timezone_identifiers, 'timezone_cmp');
$continent = '';
foreach($timezone_identifiers as $value) {
$ex = explode("/", $value);
if(count($ex) > 1) {
if($ex[0] != $continent) {
if($continent != '')
$o .= '</optgroup>';
$continent = $ex[0];
$o .= '<optgroup label="' . t($continent) . '">';
}
if(count($ex) > 2)
$city = substr($value,strpos($value,'/')+1);
else
$city = $ex[1];
}
else {
$city = $ex[0];
if($continent != 'Miscellaneous') {
$o .= '</optgroup>';
$continent = 'Miscellaneous';
$o .= '<optgroup label="' . t($continent) . '">';
}
}
$city = str_replace('_', ' ', t($city));
$selected = (($value == $current) ? " selected=\"selected\" " : "");
$o .= "<option value=\"$value\" $selected >$city</option>";
}
$o .= '</optgroup></select>';
return $o;
}}
// General purpose date parse/convert function.
// $from = source timezone
// $to = dest timezone
// $s = some parseable date/time string
// $fmt = output format
if(! function_exists('datetime_convert')) {
function datetime_convert($from = 'UTC', $to = 'UTC', $s = 'now', $fmt = "Y-m-d H:i:s") {
// Slight hackish adjustment so that 'zero' datetime actually returns what is intended
// otherwise we end up with -0001-11-30 ...
// add 32 days so that we at least get year 00, and then hack around the fact that
// months and days always start with 1.
if(substr($s,0,10) == '0000-00-00') {
$d = new DateTime($s . ' + 32 days', new DateTimeZone('UTC'));
return str_replace('1','0',$d->format($fmt));
}
$d = new DateTime($s, new DateTimeZone($from));
$d->setTimeZone(new DateTimeZone($to));
return($d->format($fmt));
}}
// wrapper for date selector, tailored for use in birthday fields
function dob($dob) {
list($year,$month,$day) = sscanf($dob,'%4d-%2d-%2d');
$y = datetime_convert('UTC',date_default_timezone_get(),'now','Y');
$o = datesel('',1920,$y,true,$year,$month,$day);
return $o;
}
// returns a date selector.
// $pre = prefix (if needed) for HTML name and class fields
// $ymin = first year shown in selector dropdown
// $ymax = last year shown in selector dropdown
// $allow_blank = allow an empty response on any field
// $y = already selected year
// $m = already selected month
// $d = already selected day
if(! function_exists('datesel')) {
function datesel($pre,$ymin,$ymax,$allow_blank,$y,$m,$d) {
$o = '';
$o .= "<select name=\"{$pre}year\" class=\"{$pre}year\" size=\"1\">";
if($allow_blank) {
$sel = (($y == '0000') ? " selected=\"selected\" " : "");
$o .= "<option value=\"0000\" $sel ></option>";
}
for($x = $ymax; $x >= $ymin; $x --) {
$sel = (($x == $y) ? " selected=\"selected\" " : "");
$o .= "<option value=\"$x\" $sel>$x</option>";
}
$o .= "</select> <select name=\"{$pre}month\" class=\"{$pre}month\" size=\"1\">";
for($x = 0; $x <= 12; $x ++) {
$sel = (($x == $m) ? " selected=\"selected\" " : "");
$y = (($x) ? $x : '');
$o .= "<option value=\"$x\" $sel>$y</option>";
}
$o .= "</select> <select name=\"{$pre}day\" class=\"{$pre}day\" size=\"1\">";
for($x = 0; $x <= 31; $x ++) {
$sel = (($x == $d) ? " selected=\"selected\" " : "");
$y = (($x) ? $x : '');
$o .= "<option value=\"$x\" $sel>$y</option>";
}
$o .= "</select>";
return $o;
}}
// implements "3 seconds ago" etc.
// based on $posted_date, (UTC).
// Results relative to current timezone
// Limited to range of timestamps
if(! function_exists('relative_date')) {
function relative_date($posted_date) {
$localtime = datetime_convert('UTC',date_default_timezone_get(),$posted_date);
$abs = strtotime($localtime);
$etime = time() - $abs;
if ($etime < 1) {
return t('less than a second ago');
}
$a = array( 12 * 30 * 24 * 60 * 60 => array( t('year'), t('years')),
30 * 24 * 60 * 60 => array( t('month'), t('months')),
7 * 24 * 60 * 60 => array( t('week'), t('weeks')),
24 * 60 * 60 => array( t('day'), t('days')),
60 * 60 => array( t('hour'), t('hours')),
60 => array( t('minute'), t('minutes')),
1 => array( t('second'), t('seconds'))
);
foreach ($a as $secs => $str) {
$d = $etime / $secs;
if ($d >= 1) {
$r = round($d);
return $r . ' ' . (($r == 1) ? $str[0] : $str[1]) . t(' ago');
}
}
}}
// Returns age in years, given a date of birth,
// the timezone of the person whose date of birth is provided,
// and the timezone of the person viewing the result.
// Why? Bear with me. Let's say I live in Mittagong, Australia. My birthday
// is on New Year's. You live in San Bruno, California.
// When exactly are you going to see my age increase?
// A: 5:00 AM Dec 31. That's when I start celebrating, and when
// my birthday arrives in your timezone.
function age($dob,$owner_tz = '',$viewer_tz = '') {
if(! intval($dob))
return 0;
if(! $owner_tz)
$owner_tz = date_default_timezone_get();
if(! $viewer_tz)
$viewer_tz = date_default_timezone_get();
$birthdate = datetime_convert('UTC',$owner_tz,$dob . ' 00:00:00+00:00','Y-m-d');
list($year,$month,$day) = explode("-",$birthdate);
$year_diff = datetime_convert('UTC',$viewer_tz,'now','Y') - $year;
$curr_month = datetime_convert('UTC',$viewer_tz,'now','m');
$curr_day = datetime_convert('UTC',$viewer_tz,'now','d');
if(($curr_month < $month) || (($curr_month == $month) && ($curr_day < $day)))
$year_diff--;
return $year_diff;
}
