From 52ba3b8146dd01c1c7d057359f4485aae5813124 Mon Sep 17 00:00:00 2001
From: Jim Hu <jimhu@users.sourceforge.net>
Date: Thu, 25 Dec 2008 18:45:26 +0000
Subject: progress on timezones and daylight time

---
 functions/is_daylight.php | 292 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 292 insertions(+)
 create mode 100644 functions/is_daylight.php

(limited to 'functions/is_daylight.php')

diff --git a/functions/is_daylight.php b/functions/is_daylight.php
new file mode 100644
index 0000000..c6f79ef
--- /dev/null
+++ b/functions/is_daylight.php
@@ -0,0 +1,292 @@
+<?php
+/* 	values are offset in hhmm (not seconds!) relative to GMT
+	case The first value is for standard, and the second value is for daylight
+*/
+function is_daylight($time, $timezone){
+	global $tz_array, $summary;
+	# default to std time, overwrite if daylight.
+	$dlst = 0;
+	# Subtract the offset for std time.  This will be slightly off in some cases, but will be closer than using nothing (?).
+	$time = $time - calcOffset($tz_array[$timezone][0]);
+	$year = date("Y", $time);
+	$month = date("m",$time);
+	$day = date("d",$time);
+	$hour = date("H",$time);
+	switch ($timezone){
+		case 'US/Samoa':                     # array('-1100', '-1100');
+		case 'America/Adak':                 # array('-1000', '-0900');
+		case 'America/Atka':    
+		case 'US/Aleutian':
+		case 'America/Anchorage':      	     # array('-0900', '-0800');
+		case 'America/Nome':      
+		case 'US/Alaska':        
+		case 'America/Juneau':   
+		case 'America/Yakutat':  
+		case 'America/Dawson':               # array('-0800', '-0700');
+		case 'America/Los_Angeles':
+		case 'America/Vancouver': 
+		case 'America/Whitehorse':
+		case 'Canada/Pacific':   
+		case 'Canada/Yukon':     
+		case 'PST8PDT':          
+		case 'US/Pacific':
+		case 'America/Boise': 	    		# array('-0700', '-0600');
+		case 'America/Cambridge_Bay':   
+		case 'America/Denver':          
+		case 'America/Edmonton':        
+		case 'America/Inuvik':          
+		case 'America/Shiprock':        
+		case 'America/Yellowknife':     
+		case 'Canada/Mountain':         
+		case 'MST7MDT':                 
+		case 'Navajo':                  
+		case 'US/Mountain':             	
+		case 'America/Chicago':       		# array('-0600', '-0500');     
+		case 'America/Menominee':       
+		case 'America/Merida':          
+		case 'America/Rainy_River':     
+		case 'America/Rankin_Inlet':    
+		case 'America/Winnipeg':        
+		case 'Canada/Central':          
+		case 'CST6CDT':                 
+		case 'US/Central':              
+		case 'America/Detroit':              # array('-0500', '-0400');
+		case 'America/Grand_Turk':      
+		case 'America/Iqaluit':         
+		case 'America/Kentucky/Louisville':
+		case 'America/Kentucky/Monticello':
+		case 'America/Louisville':      
+		case 'America/Montreal':       
+		case 'America/Nassau':         
+		case 'America/New_York':       
+		case 'America/Nipigon':        
+		case 'America/Pangnirtung':    
+		case 'America/Thunder_Bay':    
+		case 'Canada/Eastern':         
+		case 'EST5EDT':                
+		case 'US/Eastern':
+		case 'US/Michigan':
+		case 'America/Glace_Bay':            # array('-0400', '-0300');
+		case 'America/Goose_Bay':    
+		case 'America/Halifax':    
+		case 'America/Thule':      
+		case 'Canada/Atlantic':    
+		case 'America/St_Johns':             # array('-0330', '-0230');
+		case 'Canada/Newfoundland':
+		case 'America/Godthab':              # array('-0300', '-0200');
+		case 'America/Miquelon':   
+			if ($year < 2007){
+				$start 	= strtotime("+1 Sun",strtotime($year."0331"));
+				$end 	= strtotime("-1 Sun",strtotime($year."1101"));
+			}else{
+				$start 	= strtotime("+2 Sun",strtotime($year."0300"));
+				$end 	= strtotime("+1 Sun",strtotime($year."1031"));
+			}
+			break;
+		case 'America/Havana':          
+		case 'Cuba':                   
+			$start 	= strtotime("+3 Sun",strtotime($year."0300"));
+			$end 	= strtotime("-1 Sun",strtotime($year."1101"));	
+			break;
+		case 'America/Cancun':     
+		case 'America/Chihuahua':       
+		case 'America/Ensenada':   
+		case 'America/Tijuana':   
+		case 'America/Mexico_City':     
+		case 'America/Monterrey':       
+		case 'Atlantic/Bermuda':   
+		case 'Mexico/BajaSur':          
+		case 'Mexico/BajaNorte': 
+		case 'Mexico/General':          
+		case 'America/Mazatlan':        
+			$start 	= strtotime("+1 Sun",strtotime($year."0331"));
+			$end 	= strtotime("-1 Sun",strtotime($year."1101"));
+			break;
+		case 'Chile/EasterIsland':           # array('-0500', '-0600');
+		case 'Pacific/Easter':        
+	
+			break;
+		case 'America/Asuncion':        	 # array('-0300', '-0400');
+		case 'America/Cuiaba':      
+		case 'America/Santiago':    
+		case 'Antarctica/Palmer':   
+		case 'Atlantic/Stanley':    
+		case 'Chile/Continental':   
+	
+			break;
+		case 'America/Araguaina':       	 # array('-0200', '-0300');
+		case 'America/Sao_Paulo':  
+		case 'Brazil/East':        
+	
+			break;
+		case 'America/Scoresbysund':         # array('-0100', '+0000');
+		case 'Atlantic/Azores':    
+	
+			break;
+		case 'Atlantic/Canary':              # array('+0000', '+0100');
+		case 'Atlantic/Faeroe':    
+		case 'Atlantic/Madeira':   
+		case 'Eire':
+		case 'Europe/Belfast':     
+		case 'Europe/Dublin':      
+		case 'Europe/Lisbon':      
+		case 'Europe/London':      
+		case 'GB-Eire':            
+		case 'GB':                 
+		case 'Portugal':           
+		case 'WET':                
+	
+			break;
+		case 'Africa/Ceuta': 	             # array('+0100', '+0200'); 
+		case 'Arctic/Longyearbyen':
+		case 'CET':                 
+		case 'Europe/Amsterdam':    
+		case 'Europe/Andorra':      
+		case 'Europe/Belgrade':     
+		case 'Europe/Berlin':       
+		case 'Europe/Bratislava':   
+		case 'Europe/Brussels':     
+		case 'Europe/Budapest':     
+		case 'Europe/Copenhagen':   
+		case 'Europe/Gibraltar':    
+		case 'Europe/Ljubljana':    
+		case 'Europe/Luxembourg':   
+		case 'Europe/Madrid':       
+		case 'Europe/Malta':        
+		case 'Europe/Monaco':       
+		case 'Europe/Oslo':         
+		case 'Europe/Paris':        
+		case 'Europe/Prague':       
+		case 'Europe/Rome':         
+		case 'Europe/San_Marino':   
+		case 'Europe/Sarajevo':     
+		case 'Europe/Skopje':       
+		case 'Europe/Stockholm':    
+		case 'Europe/Tirane':       
+		case 'Europe/Vaduz':        
+		case 'Europe/Vatican':      
+		case 'Europe/Vienna':       
+		case 'Europe/Warsaw':       
+		case 'Europe/Zagreb':         
+		case 'Europe/Zurich':         
+		case 'MET':                   
+		case 'Poland':                
+			$start 	= strtotime("-1 Sun",strtotime($year."0401"));
+			$end 	= strtotime("-1 Sun",strtotime($year."1101"));	
+			break;
+		case 'Africa/Windhoek':       	     # array('+0200', '+0100');
+	
+			break;
+		case 'Asia/Amman':                   # array('+0200', '+0300');
+		case 'Asia/Beirut':          
+		case 'Asia/Damascus':     
+		case 'Asia/Gaza':         
+		case 'Asia/Istanbul':        
+		case 'Asia/Jerusalem':       
+		case 'Asia/Nicosia':      
+		case 'Asia/Tel_Aviv':     
+		case 'EET':               
+		case 'Egypt':             
+		case 'Europe/Athens':     
+		case 'Europe/Bucharest':  
+		case 'Europe/Chisinau':   
+		case 'Europe/Helsinki':   
+		case 'Europe/Istanbul':   
+		case 'Europe/Kaliningrad':
+		case 'Europe/Kiev':       
+		case 'Europe/Minsk':      
+		case 'Europe/Nicosia':    
+		case 'Europe/Riga':       
+		case 'Europe/Simferopol': 
+		case 'Europe/Sofia':      
+		case 'Europe/Tiraspol':   
+		case 'Europe/Uzhgorod':   
+		case 'Europe/Zaporozhye': 
+		case 'Israel':            
+		case 'Turkey':            
+	
+			break;
+		case 'Asia/Baghdad':                 # array('+0300', '+0400');
+		case 'Europe/Moscow':
+		case 'W-SU':                 
+	
+			break;
+		case 'Asia/Tehran':                  # array('+0330', '+0430');
+		case 'Iran':       
+	
+			break;
+		case 'Asia/Aqtau':                   # array('+0400', '+0500');
+		case 'Asia/Baku':            
+		case 'Asia/Tbilisi':         
+		case 'Asia/Yerevan':         
+		case 'Europe/Samara':
+	
+			break;
+		case 'Asia/Aqtobe':                  # array('+0500', '+0600');
+		case 'Asia/Bishkek':         
+		case 'Asia/Yekaterinburg':   
+	
+			break;
+		case 'Asia/Almaty':                  # array('+0600', '+0700');
+		case 'Asia/Novosibirsk':     
+		case 'Asia/Omsk':            
+	
+			break;
+		case 'Asia/Krasnoyarsk':             # array('+0700', '+0800');
+	
+			break;
+		case 'Asia/Irkutsk':                 # array('+0800', '+0900');
+	
+			break;
+		case 'Asia/Yakutsk':                 # array('+0900', '+1000');
+		
+		
+			break;
+		case 'Asia/Vladivostok':             # array('+1000', '+1100');
+		case 'Australia/ACT':        
+		case 'Australia/Melbourne':  
+		case 'Australia/NSW':        
+		case 'Australia/Sydney':     
+		case 'Australia/Tasmania':   
+		case 'Australia/Victoria':   
+	
+			break;
+		case 'Australia/Adelaide':           # array('+1030', '+0930');
+		case 'Australia/Broken_Hill':
+		case 'Australia/South':      
+		case 'Australia/Yancowinna': 
+	
+			break;
+		case 'Asia/Magadan':                 # array('+1100', '+1200');
+	
+			break;
+		case 'Australia/LHI':                # array('+1100', '+1030');
+		case 'Australia/Lord_Howe':  
+	
+			break;
+		case 'Australia/Canberra':           # array('+1100', '+1000');
+		case 'Australia/Hobart':     
+	
+			break;
+		case 'Asia/Anadyr':                  # array('+1200', '+1300');
+		case 'Asia/Kamchatka':       
+	
+			break;
+		case 'Antarctica/McMurdo':
+		case 'Antarctica/South_Pole':
+		case 'NZ':                           # array('+1300', '+1200');
+		case 'Pacific/Auckland':  
+			break;	
+		case 'NZ-CHAT':           
+		case 'Pacific/Chatham':              # array('+1345', '+1245');
+			break;
+		default:
+			$dlst = date('I', $time);
+	}
+	if (isset($start,$end) && $time >= $start && $time < $end) $dlst = 1;
+	echo "$summary $dlst <br>";
+
+	return $dlst;
+
+}
+?>
\ No newline at end of file
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