diff --git a/Foundation/src/DateTimeParser.cpp b/Foundation/src/DateTimeParser.cpp
index 08b3494ac5..3d088be533 100644
--- a/Foundation/src/DateTimeParser.cpp
+++ b/Foundation/src/DateTimeParser.cpp
@@ -309,6 +309,36 @@ void DateTimeParser::parse(const std::string& fmt, const std::string& dtStr, Dat
 	}
 	// Skip trailing whitespace
 	while (it != end && Ascii::isSpace(*it)) ++it;
+	// Skip optional fractional seconds ('.NNN' or '.NNNNNN') left unconsumed
+	// when the format used %S (integer seconds) but the input contains sub-second
+	// precision (e.g. "2013-10-07 08:23:19.120-04:00" parsed with ISO8601_FORMAT
+	// which uses %S not %s).
+	if (it != end && (*it == '.' || *it == ','))
+	{
+		auto savedIt = it;
+		++it; // skip the separator
+		if (it != end && Ascii::isDigit(*it))
+		{
+			while (it != end && Ascii::isDigit(*it)) ++it; // skip digits
+		}
+		else
+		{
+			it = savedIt; // no digits after separator - not fractional seconds
+		}
+	}
+	// Skip optional trailing timezone designator (e.g. 'Z', '+04:00', '-04:00',
+	// named zones such as 'GMT') for compatibility with ISO 8601, RFC 3339 and
+	// ASN.1 UTCTime/GeneralizedTime formats that carry timezone information not
+	// matched by the format string.  Use parseTZD() so that all recognised TZD
+	// patterns are consumed; restore the iterator if parseTZD throws (unknown or
+	// partially-parsed designator) so that the trailing-garbage check below still
+	// catches truly invalid suffixes.
+	if (it != end && (*it == 'Z' || *it == 'z' || *it == '+' || *it == '-' || Ascii::isAlpha(*it)))
+	{
+		auto savedIt = it;
+		try { parseTZD(it, end); }
+		catch (...) { it = savedIt; }
+	}
 	// Check for unconsumed input
 	if (it != end)
 		throw SyntaxException("Invalid DateTimeString: " + dtStr + ", unexpected trailing characters");
diff --git a/Foundation/src/Timezone_UNIX.cpp b/Foundation/src/Timezone_UNIX.cpp
index d1489e72ff..8b14f6f112 100644
--- a/Foundation/src/Timezone_UNIX.cpp
+++ b/Foundation/src/Timezone_UNIX.cpp
@@ -17,7 +17,9 @@
 #include <mutex>
 #include <ctime>
 #include <cstdlib>
+#include <cstring>
 #include <string>
+#include <sys/stat.h>
 
 
 namespace Poco {
@@ -66,13 +68,52 @@ class TZInfo
 	{
 		const char* tz = std::getenv("TZ");
 		_cachedTZ = tz ? tz : "";
+		cacheLocaltimeStat();
 	}
 
 	bool tzChanged() const
 	{
 		const char* tz = std::getenv("TZ");
 		std::string currentTZ = tz ? tz : "";
-		return currentTZ != _cachedTZ;
+		if (currentTZ != _cachedTZ) return true;
+		return localtimeStatChanged();
+	}
+
+	void cacheLocaltimeStat()
+	{
+		struct stat st{};
+		if (::stat("/etc/localtime", &st) == 0)
+		{
+			_localtime_ino = st.st_ino;
+			_localtime_mtime = st.st_mtime;
+		}
+		else
+		{
+			_localtime_ino = 0;
+			_localtime_mtime = 0;
+		}
+	}
+
+	bool localtimeStatChanged() const
+	{
+		struct stat st{};
+		if (::stat("/etc/localtime", &st) == 0)
+		{
+			if (st.st_ino != _localtime_ino || st.st_mtime != _localtime_mtime)
+			{
+				_localtime_ino = st.st_ino;
+				_localtime_mtime = st.st_mtime;
+				return true;
+			}
+			return false;
+		}
+		// /etc/localtime not accessible: treat as changed only if we had it before
+		if (_localtime_ino != 0) {
+			_localtime_ino = 0;
+			_localtime_mtime = 0;
+			return true;
+		}
+		return false;
 	}
 
 	static int computeTimeZone()
@@ -112,6 +153,8 @@ class TZInfo
 	std::mutex _mutex;
 	int _tzOffset;
 	std::string _cachedTZ;
+	mutable ino_t _localtime_ino = 0;
+	mutable time_t _localtime_mtime = 0;
 };