added: TimeZone struct (core)

this class has information about a time zone (utf offset, daylight saving time)
       and methods for converting between UTC and local time
       structs User and Config has a TimeZone object
       System::ToLocal() and System::ToUTC() uses it for converting
       (depending whether a user is logged or not)


git-svn-id: svn://ttmath.org/publicrep/winix/trunk@842 e52654a7-88a9-db11-a3e9-0013d4bc506e

core/config.h

@@ -13,6 +13,7 @@
 #include <string>
 #include "space/spaceparser.h"
 #include "htmlfilter.h"
+#include "timezone.h"
 
 
 
@@ -374,15 +375,6 @@ public:
 	// (if true the html code for root is not filtered)
 	bool editors_html_safe_mode_skip_root;
 
-	// temporarily we do not support time zones per user
-	// there is one offset for all users
-	// default: 0
-	int time_zone_offset;
-
-	// time zone offset for guests (not logged users)
-	// default: 0
-	int time_zone_offset_guest;
-
 	// charset used in templates, locales, logs etc.
 	// default: true (UTF-8)
 	// if false it means 8-bit ASCII
@@ -478,6 +470,18 @@ public:
 	// default: 86400 (24 hours)
 	long reset_password_code_expiration_time;
 
+	// time zone for guests
+	// or for users who don't have time zone set
+	// following options are read:
+	//	  "tz_offset"  (long)
+	//	  "tz_has_dst" (bool)
+	//	if tz_has_dst is true then also:
+	//	  "tz_dst_start"  date in the following format: MM:DD HH[:MM[:SS]]
+	//	  "tz_dst_end"    the same as above
+	//	  "tz_dst_offset" (long)
+ 	TimeZone time_zone;
+
+
 
 	Config();
 	bool ReadConfig(bool errors_to_stdout_, bool stdout_is_closed = true);