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@ -1,5 +1,7 @@
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<?php
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// two-level sort for timezones.
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if(! function_exists('timezone_cmp')) {
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function timezone_cmp($a, $b) {
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if(strstr($a,'/') && strstr($b,'/')) {
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@ -12,6 +14,7 @@ function timezone_cmp($a, $b) {
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return ( t($a) < t($b)) ? -1 : 1;
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}}
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// emit a timezone selector grouped (primarily) by continent
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if(! function_exists('select_timezone')) {
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function select_timezone($current = 'America/Los_Angeles') {
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@ -52,6 +55,11 @@ function select_timezone($current = 'America/Los_Angeles') {
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return $o;
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}}
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// General purpose date parse/convert function.
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// $from = source timezone
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// $to = dest timezone
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// $s = some parseable date/time string
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// $fmt = output format
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if(! function_exists('datetime_convert')) {
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function datetime_convert($from = 'UTC', $to = 'UTC', $s = 'now', $fmt = "Y-m-d H:i:s") {
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@ -71,6 +79,8 @@ function datetime_convert($from = 'UTC', $to = 'UTC', $s = 'now', $fmt = "Y-m-d
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return($d->format($fmt));
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}}
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// wrapper for date selector, tailored for use in birthday fields
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function dob($dob) {
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list($year,$month,$day) = sscanf($dob,'%4d-%2d-%2d');
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$y = datetime_convert('UTC',date_default_timezone_get(),'now','Y');
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@ -78,6 +88,16 @@ function dob($dob) {
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return $o;
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}
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// returns a date selector.
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// $pre = prefix (if needed) for HTML name and class fields
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// $ymin = first year shown in selector dropdown
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// $ymax = last year shown in selector dropdown
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// $allow_blank = allow an empty response on any field
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// $y = already selected year
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// $m = already selected month
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// $d = already selected day
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if(! function_exists('datesel')) {
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function datesel($pre,$ymin,$ymax,$allow_blank,$y,$m,$d) {
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@ -111,6 +131,10 @@ function datesel($pre,$ymin,$ymax,$allow_blank,$y,$m,$d) {
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return $o;
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}}
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// implements "3 seconds ago" etc.
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// based on $posted_date, (UTC).
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// Results relative to current timezone
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// Limited to range of timestamps
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if(! function_exists('relative_date')) {
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function relative_date($posted_date) {
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@ -143,6 +167,16 @@ function relative_date($posted_date) {
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}}
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// Returns age in years, given a date of birth,
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// the timezone of the person whose date of birth is provided,
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// and the timezone of the person viewing the result.
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// Why? Bear with me. Let's say I live in Mittagong, Australia. My birthday
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// is on New Year's. You live in San Bruno, California.
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// When exactly are you going to see my age increase?
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// A: 5:00 AM Dec 31. That's when I start celebrating, and when
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// my birthday arrives in your timezone.
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function age($dob,$owner_tz = '',$viewer_tz = '') {
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if(! intval($dob))
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return 0;
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