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-rw-r--r--include/datetime.php34
1 files changed, 34 insertions, 0 deletions
diff --git a/include/datetime.php b/include/datetime.php
index d241f779e..02250ec07 100644
--- a/include/datetime.php
+++ b/include/datetime.php
@@ -1,5 +1,7 @@
<?php
+// two-level sort for timezones.
+
if(! function_exists('timezone_cmp')) {
function timezone_cmp($a, $b) {
if(strstr($a,'/') && strstr($b,'/')) {
@@ -12,6 +14,7 @@ function timezone_cmp($a, $b) {
return ( t($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') {
@@ -52,6 +55,11 @@ function select_timezone($current = 'America/Los_Angeles') {
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', $fmt = "Y-m-d H:i:s") {
@@ -71,6 +79,8 @@ function datetime_convert($from = 'UTC', $to = 'UTC', $s = 'now', $fmt = "Y-m-d
return($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');
$y = datetime_convert('UTC',date_default_timezone_get(),'now','Y');
@@ -78,6 +88,16 @@ function dob($dob) {
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) {
@@ -111,6 +131,10 @@ function datesel($pre,$ymin,$ymax,$allow_blank,$y,$m,$d) {
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) {
@@ -143,6 +167,16 @@ function relative_date($posted_date) {
}}
+
+// Returns age in years, given a date of birth,
+// the timezone of the person whose date of birth is provided,
+// and the timezone of the person viewing the result.
+// Why? Bear with me. Let's say I live in Mittagong, Australia. My birthday
+// is on New Year's. You live in San Bruno, California.
+// When exactly are you going to see my age increase?
+// A: 5:00 AM Dec 31. That's when I start celebrating, and when
+// my birthday arrives in your timezone.
+
function age($dob,$owner_tz = '',$viewer_tz = '') {
if(! intval($dob))
return 0;