include.datetime.php

<?php
/*
 * CPHP is more free software. It is licensed under the WTFPL, which
 * allows you to do pretty much anything with it, without having to
 * ask permission. Commercial use is allowed, and no attribution is
 * required. We do politely request that you share your modifications
 * to benefit other developers, but you are under no enforced
 * obligation to do so :)
 * 
 * Please read the accompanying LICENSE document for the full WTFPL
 * licensing text.
 */

if($_CPHP !== true) { die(); }

if(!empty($cphp_config->locale->default_timezone))
{
	$user_preferences[CPHP_SETTING_TIMEZONE] = $cphp_config->locale->default_timezone;
}
else
{
	die("No default timezone was specified. Refer to the CPHP manual for instructions.");
}

$timezones = array(
	'Pacific/Kwajalein' => 			'(GMT-12:00) International Date Line West',
	'Pacific/Midway' => 			'(GMT-11:00) Midway Island',
	'Pacific/Samoa' => 			'(GMT-11:00) Samoa',
	'Pacific/Honolulu' => 			'(GMT-10:00) Hawaii',
	'America/Anchorage' => 			'(GMT-09:00) Alaska',
	'America/Los_Angeles' => 		'(GMT-08:00) Pacific Time (US &amp; Canada)',
	'America/Tijuana' => 			'(GMT-08:00) Tijuana, Baja California',
	'America/Denver' => 			'(GMT-07:00) Mountain Time (US &amp; Canada)',
	'America/Chihuahua' => 			'(GMT-07:00) Chihuahua',
	'America/Mazatlan' => 			'(GMT-07:00) Mazatlan',
	'America/Phoenix' => 			'(GMT-07:00) Arizona',
	'America/Regina' => 			'(GMT-06:00) Saskatchewan',
	'America/Tegucigalpa' => 		'(GMT-06:00) Central America',
	'America/Chicago' => 			'(GMT-06:00) Central Time (US &amp; Canada)',
	'America/Mexico_City' => 		'(GMT-06:00) Mexico City',
	'America/Monterrey' => 			'(GMT-06:00) Monterrey',
	'America/New_York' => 			'(GMT-05:00) Eastern Time (US &amp; Canada)',
	'America/Bogota' => 			'(GMT-05:00) Bogota',
	'America/Lima' => 			'(GMT-05:00) Lima',
	'America/Rio_Branco' => 		'(GMT-05:00) Rio Branco',
	'America/Indiana/Indianapolis' => 	'(GMT-05:00) Indiana (East)',
	'America/Caracas' => 			'(GMT-04:30) Caracas',
	'America/Halifax' => 			'(GMT-04:00) Atlantic Time (Canada)',
	'America/Manaus' => 			'(GMT-04:00) Manaus',
	'America/Santiago' => 			'(GMT-04:00) Santiago',
	'America/La_Paz' => 			'(GMT-04:00) La Paz',
	'America/St_Johns' => 			'(GMT-03:30) Newfoundland',
	'America/Argentina/Buenos_Aires' => 	'(GMT-03:00) Georgetown',
	'America/Sao_Paulo' =>			'(GMT-03:00) Brasilia',
	'America/Godthab' => 			'(GMT-03:00) Greenland',
	'America/Montevideo' => 		'(GMT-03:00) Montevideo',
	'Atlantic/South_Georgia' => 		'(GMT-02:00) Mid-Atlantic',
	'Atlantic/Azores' => 			'(GMT-01:00) Azores',
	'Atlantic/Cape_Verde' => 		'(GMT-01:00) Cape Verde Is.',
	'Europe/Dublin' => 			'(GMT) Dublin',
	'Europe/Lisbon' => 			'(GMT) Lisbon',
	'Europe/London' => 			'(GMT) London',
	'Africa/Monrovia' => 			'(GMT) Monrovia',
	'Atlantic/Reykjavik' =>			'(GMT) Reykjavik',
	'Africa/Casablanca' => 			'(GMT) Casablanca',
	'Europe/Belgrade' => 			'(GMT+01:00) Belgrade',
	'Europe/Bratislava' => 			'(GMT+01:00) Bratislava',
	'Europe/Budapest' => 			'(GMT+01:00) Budapest',
	'Europe/Ljubljana' => 			'(GMT+01:00) Ljubljana',
	'Europe/Prague' => 			'(GMT+01:00) Prague',
	'Europe/Sarajevo' => 			'(GMT+01:00) Sarajevo',
	'Europe/Skopje' => 			'(GMT+01:00) Skopje',
	'Europe/Warsaw' => 			'(GMT+01:00) Warsaw',
	'Europe/Zagreb' => 			'(GMT+01:00) Zagreb',
	'Europe/Brussels' => 			'(GMT+01:00) Brussels',
	'Europe/Copenhagen' => 			'(GMT+01:00) Copenhagen',
	'Europe/Madrid' => 			'(GMT+01:00) Madrid',
	'Europe/Paris' => 			'(GMT+01:00) Paris',
	'Africa/Algiers' => 			'(GMT+01:00) West Central Africa',
	'Europe/Amsterdam' => 			'(GMT+01:00) Amsterdam',
	'Europe/Berlin' => 			'(GMT+01:00) Berlin',
	'Europe/Rome' => 			'(GMT+01:00) Rome',
	'Europe/Stockholm' =>			'(GMT+01:00) Stockholm',
	'Europe/Vienna' => 			'(GMT+01:00) Vienna',
	'Europe/Minsk' => 			'(GMT+02:00) Minsk',
	'Africa/Cairo' =>		 	'(GMT+02:00) Cairo',
	'Europe/Helsinki' =>			'(GMT+02:00) Helsinki',
	'Europe/Riga' =>		 	'(GMT+02:00) Riga',
	'Europe/Sofia' =>		 	'(GMT+02:00) Sofia',
	'Europe/Tallinn' =>		 	'(GMT+02:00) Tallinn',
	'Europe/Vilnius' =>		 	'(GMT+02:00) Vilnius',
	'Europe/Athens' =>		 	'(GMT+02:00) Athens',
	'Europe/Bucharest' =>			'(GMT+02:00) Bucharest',
	'Europe/Istanbul' =>			'(GMT+02:00) Istanbul',
	'Asia/Jerusalem' =>		 	'(GMT+02:00) Jerusalem',
	'Asia/Amman' =>		 		'(GMT+02:00) Amman',
	'Asia/Beirut' =>		 	'(GMT+02:00) Beirut',
	'Africa/Windhoek' =>			'(GMT+02:00) Windhoek',
	'Africa/Harare' =>		 	'(GMT+02:00) Harare',
	'Asia/Kuwait' =>		 	'(GMT+03:00) Kuwait',
	'Asia/Riyadh' =>		 	'(GMT+03:00) Riyadh',
	'Asia/Baghdad' =>		 	'(GMT+03:00) Baghdad',
	'Africa/Nairobi' =>		 	'(GMT+03:00) Nairobi',
	'Asia/Tbilisi' =>		 	'(GMT+03:00) Tbilisi',
	'Europe/Moscow' =>		 	'(GMT+03:00) Moscow',
	'Europe/Volgograd' =>			'(GMT+03:00) Volgograd',
	'Asia/Tehran' =>		 	'(GMT+03:30) Tehran',
	'Asia/Muscat' =>		 	'(GMT+04:00) Muscat',
	'Asia/Baku' =>		 		'(GMT+04:00) Baku',
	'Asia/Yerevan' =>		 	'(GMT+04:00) Yerevan',
	'Asia/Yekaterinburg' =>			'(GMT+05:00) Ekaterinburg',
	'Asia/Karachi' =>		 	'(GMT+05:00) Karachi',
	'Asia/Tashkent' =>		 	'(GMT+05:00) Tashkent',
	'Asia/Kolkata' =>		 	'(GMT+05:30) Calcutta',
	'Asia/Colombo' =>		 	'(GMT+05:30) Sri Jayawardenepura',
	'Asia/Katmandu' =>		 	'(GMT+05:45) Kathmandu',
	'Asia/Dhaka' =>		 		'(GMT+06:00) Dhaka',
	'Asia/Almaty' =>		 	'(GMT+06:00) Almaty',
	'Asia/Novosibirsk' =>		 	'(GMT+06:00) Novosibirsk',
	'Asia/Rangoon' =>		 	'(GMT+06:30) Yangon (Rangoon)',
	'Asia/Krasnoyarsk' =>		 	'(GMT+07:00) Krasnoyarsk',
	'Asia/Bangkok' =>		 	'(GMT+07:00) Bangkok',
	'Asia/Jakarta' =>		 	'(GMT+07:00) Jakarta',
	'Asia/Brunei' =>		 	'(GMT+08:00) Beijing',
	'Asia/Chongqing' =>		 	'(GMT+08:00) Chongqing',
	'Asia/Hong_Kong' =>		 	'(GMT+08:00) Hong Kong',
	'Asia/Urumqi' =>		 	'(GMT+08:00) Urumqi',
	'Asia/Irkutsk' =>		 	'(GMT+08:00) Irkutsk',
	'Asia/Ulaanbaatar' =>		 	'(GMT+08:00) Ulaan Bataar',
	'Asia/Kuala_Lumpur' =>		 	'(GMT+08:00) Kuala Lumpur',
	'Asia/Singapore' =>			'(GMT+08:00) Singapore',
	'Asia/Taipei' =>			'(GMT+08:00) Taipei',
	'Australia/Perth' =>		 	'(GMT+08:00) Perth',
	'Asia/Seoul' =>				'(GMT+09:00) Seoul',
	'Asia/Tokyo' =>				'(GMT+09:00) Tokyo',
	'Asia/Yakutsk' =>			'(GMT+09:00) Yakutsk',
	'Australia/Darwin' =>		 	'(GMT+09:30) Darwin',
	'Australia/Adelaide' =>		 	'(GMT+09:30) Adelaide',
	'Australia/Canberra' =>		 	'(GMT+10:00) Canberra',
	'Australia/Melbourne' =>		'(GMT+10:00) Melbourne',
	'Australia/Sydney' =>		 	'(GMT+10:00) Sydney',
	'Australia/Brisbane' =>		 	'(GMT+10:00) Brisbane',
	'Australia/Hobart' =>		 	'(GMT+10:00) Hobart',
	'Asia/Vladivostok' =>		 	'(GMT+10:00) Vladivostok',
	'Pacific/Guam' =>			'(GMT+10:00) Guam',
	'Pacific/Port_Moresby' =>		'(GMT+10:00) Port Moresby',
	'Asia/Magadan' =>			'(GMT+11:00) Magadan',
	'Pacific/Fiji' =>			'(GMT+12:00) Fiji',
	'Asia/Kamchatka' =>			'(GMT+12:00) Kamchatka',
	'Pacific/Auckland' =>		 	'(GMT+12:00) Auckland',
	'Pacific/Tongatapu' =>		 	'(GMT+13:00) Nukualofa'
);

function unix_from_local($timestamp)
{
	global $user_preferences;
	date_default_timezone_set($user_preferences[CPHP_SETTING_TIMEZONE]);
	return strtotime($timestamp);
}

function unix_from_mysql($timestamp)
{
	date_default_timezone_set("GMT");
	return strtotime($timestamp);
}

function local_from_unix($timestamp, $format)
{
	global $user_preferences;
	date_default_timezone_set($user_preferences[CPHP_SETTING_TIMEZONE]);
	return strftime($format, $timestamp);
}

function gmt_from_unix($timestamp, $format)
{
	date_default_timezone_set("GMT");
	return strftime($format, $timestamp);
}

function mysql_from_unix($timestamp)
{
	date_default_timezone_set("GMT");
	return date("Y-m-d H:i:s", $timestamp);
}

function floor_to_day($timestamp)
{
	return floor($timestamp / (60 * 60 * 24)) * (60 * 60 * 24);
}

function time_ago($timestamp, $locale)
{
	if(is_numeric($timestamp))
	{
		if($timestamp > time())
		{
			$sTimeAgo = $locale->strings['event-future'];
		}
		elseif($timestamp == time())
		{
			$sTimeAgo = $locale->strings['event-now'];
		}
		else
		{
			$date1 = new DateTime("@{$timestamp}", new DateTimeZone("GMT"));
			$date2 = new DateTime("now", new DateTimeZone("GMT"));
			
			$interval = $date1->diff($date2);
			$years = (int)$interval->y;
			$months = (int)$interval->m;
			$weeks = (int)$interval->format("%U");
			$days = (int)$interval->d;
			$hours = (int)$interval->h;
			$minutes = (int)$interval->i;
			$seconds = (int)$interval->s;
			
			if($years > 1)
			{
				$sTimeAgo = sprintf($locale->strings['event-years-ago'], $years);
			}
			elseif($years == 1)
			{
				$sTimeAgo = $locale->strings['event-1year-ago'];
			}
			elseif($months > 1)
			{
				$sTimeAgo = sprintf($locale->strings['event-months-ago'], $months);
			}
			elseif($months == 1)
			{
				$sTimeAgo = $locale->strings['event-1month-ago'];
			}
			elseif($weeks > 1)
			{
				$sTimeAgo = sprintf($locale->strings['event-weeks-ago'], $weeks);
			}
			elseif($weeks == 1)
			{
				$sTimeAgo = $locale->strings['event-1week-ago'];
			}
			elseif($days > 1)
			{
				$sTimeAgo = sprintf($locale->strings['event-days-ago'], $days);
			}
			elseif($days == 1)
			{
				$sTimeAgo = $locale->strings['event-1day-ago'];
			}
			elseif($hours > 1)
			{
				$sTimeAgo = sprintf($locale->strings['event-hours-ago'], $hours);
			}
			elseif($hours == 1)
			{
				$sTimeAgo = $locale->strings['event-1hour-ago'];
			}
			elseif($minutes > 1)
			{
				$sTimeAgo = sprintf($locale->strings['event-minutes-ago'], $minutes);
			}
			elseif($minutes == 1)
			{
				$sTimeAgo = $locale->strings['event-1minute-ago'];
			}
			elseif($seconds > 1)
			{
				$sTimeAgo = sprintf($locale->strings['event-seconds-ago'], $seconds);
			}
			elseif($seconds == 1)
			{
				$sTimeAgo = $locale->strings['event-1second-ago'];
			}
			else
			{
				/* If you see this, there's probably something wrong. */
				$sTimeAgo = $locale->strings['event-past'];
			}
			
		}
		
		return $sTimeAgo;
	}
	else
	{
		throw new Exception("The given timestamp is not numeric. Timestamps must be provided in Unix timestamp format.");
	}
}