#3509: fix dst and utcOffset handling for Dublin time zone

Foundation/include/Poco/Timezone.h

@@ -32,32 +32,44 @@ public:
 	static int utcOffset();
 		/// Returns the offset of local time to UTC, in seconds.
 		///     local time = UTC + utcOffset() + dst().
-		
+
 	static int dst();
 		/// Returns the daylight saving time offset in seconds if
 		/// daylight saving time is in use.
 		///     local time = UTC + utcOffset() + dst().
-	
+
 	static bool isDst(const Timestamp& timestamp);
 		/// Returns true if daylight saving time is in effect
 		/// for the given time. Depending on the operating system
 		/// platform this might only work reliably for certain
 		/// date ranges, as the C library's localtime() function
 		/// is used.
-		
+
 	static int tzd();
 		/// Returns the time zone differential for the current timezone.
 		/// The timezone differential is computed as utcOffset() + dst()
 		/// and is expressed in seconds.
-	
+
 	static std::string name();
 		/// Returns the timezone name currently in effect.
-		
+
 	static std::string standardName();
 		/// Returns the timezone name if not daylight saving time is in effect.
-		
+
 	static std::string dstName();
 		/// Returns the timezone name if daylight saving time is in effect.
+
+#if !defined(POCO_OS_FAMILY_WINDOWS)
+	static int utcOffset(const Poco::Timestamp& timestamp);
+		/// Returns the offset of local time to UTC
+		/// for the given time, in seconds.
+		///     local time = UTC + utcOffset() + dst().
+
+	static int dst(const Poco::Timestamp& timestamp);
+		/// Returns the daylight saving time offset in seconds if
+		/// daylight saving time is in use for the given time.
+		///     local time = UTC + utcOffset() + dst().
+#endif
 };