diff --git a/inc/doy.h b/inc/doy.h
new file mode 100644
index 0000000..0e495a9
--- /dev/null
+++ b/inc/doy.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <ctime>
+
+namespace mrbesen::doy {
+
+unsigned int getDOY(bool timezone = false, time_t time = 0); //get the doy of today or specific time, timezone = false -> dont compensate for timezone, true -> compensate for timezone, returns 0 on error
+
+
+}
\ No newline at end of file
diff --git a/inc/files.h b/inc/files.h
index 50e31bb..1931498 100644
--- a/inc/files.h
+++ b/inc/files.h
@@ -4,7 +4,7 @@
 #include <iterator>
 #include <string>
 
-namespace mrbesen::Files {
+namespace mrbesen::files {
 
 void parent(const std::string& child, std::string& out); //get the parent directory of a file or directory path
 void file(const std::string& path, std::string& out); //get the filename without the path
diff --git a/inc/mrbesen.h b/inc/mrbesen.h
index d0db718..5080701 100644
--- a/inc/mrbesen.h
+++ b/inc/mrbesen.h
@@ -1,3 +1,4 @@
+#include "doy.h"
 #include "files.h"
 #include "util.h"
 
diff --git a/inc/util.h b/inc/util.h
index 875f6d0..a753a56 100644
--- a/inc/util.h
+++ b/inc/util.h
@@ -2,7 +2,7 @@
 
 #include <string>
 
-namespace mrbesen::Util {
+namespace mrbesen::util {
 
 unsigned int count(const std::string& str, char c); //count occurances of c in str
 
diff --git a/src/doy.cpp b/src/doy.cpp
new file mode 100644
index 0000000..f318a35
--- /dev/null
+++ b/src/doy.cpp
@@ -0,0 +1,15 @@
+#include "doy.h"
+
+unsigned int mrbesen::doy::getDOY(bool timezone, time_t ttime) {
+	if(ttime == 0) {
+		ttime = time(nullptr);
+	}
+	
+	struct tm* timestruct = timezone ? localtime(&ttime) : gmtime(&ttime);
+	
+	if(timestruct) {
+		return timestruct->tm_yday +1;
+	}
+
+	return 0;
+}
\ No newline at end of file
diff --git a/src/files.cpp b/src/files.cpp
index 06c92f6..2134f8a 100644
--- a/src/files.cpp
+++ b/src/files.cpp
@@ -5,7 +5,7 @@
 #include <set>
 #include "util.h"
 
-void mrbesen::Files::parent(const std::string& child, std::string& out) {
+void mrbesen::files::parent(const std::string& child, std::string& out) {
 	//letzten path trenner finden
 	size_t pos = child.rfind('/', child.length() -2); //das erste Zeichen überspringen (könnte ein / sein)
 	if(pos == std::string::npos)
@@ -16,7 +16,7 @@ void mrbesen::Files::parent(const std::string& child, std::string& out) {
 		out = "";
 }
 
-void mrbesen::Files::file(const std::string& path, std::string& out) {
+void mrbesen::files::file(const std::string& path, std::string& out) {
 	//letzten path trenner finden
 	size_t pos = path.rfind('/', path.length() -2); //das erste Zeichen überspringen (könnte ein / sein)
 	if(pos == std::string::npos)
@@ -27,7 +27,7 @@ void mrbesen::Files::file(const std::string& path, std::string& out) {
 		out = path;
 }
 
-void mrbesen::Files::extention(const std::string& path, std::string& ext) {
+void mrbesen::files::extention(const std::string& path, std::string& ext) {
 	std::string filestr;
 	file(path, filestr);
 	size_t pos = filestr.rfind('.');
@@ -41,18 +41,18 @@ void mrbesen::Files::extention(const std::string& path, std::string& ext) {
 }
 
 template<class Container>
-bool mrbesen::Files::scan(const std::string& path, std::insert_iterator<Container> it, bool prefixdir, fileNameFilter fnf) {
+bool mrbesen::files::scan(const std::string& path, std::insert_iterator<Container> it, bool prefixdir, fileNameFilter fnf) {
 	return scan(path, [&](const std::string& p, FileType t){ it = p; }, prefixdir, fnf);
 }
 
 //curently only these are supported, because iterators may break on others upon insertion
-template bool mrbesen::Files::scan<std::list<std::string>>(const std::string&, std::insert_iterator<std::list<std::string>>, bool, fileNameFilter);
-template bool mrbesen::Files::scan<std::set<std::string>>(const std::string&, std::insert_iterator<std::set<std::string>>, bool, fileNameFilter);
-template bool mrbesen::Files::scan<std::multiset<std::string>>(const std::string&, std::insert_iterator<std::multiset<std::string>>, bool, fileNameFilter);
+template bool mrbesen::files::scan<std::list<std::string>>(const std::string&, std::insert_iterator<std::list<std::string>>, bool, fileNameFilter);
+template bool mrbesen::files::scan<std::set<std::string>>(const std::string&, std::insert_iterator<std::set<std::string>>, bool, fileNameFilter);
+template bool mrbesen::files::scan<std::multiset<std::string>>(const std::string&, std::insert_iterator<std::multiset<std::string>>, bool, fileNameFilter);
 
-bool mrbesen::Files::scan(const std::string& path, fileCallback clb, bool prefixdir, fileNameFilter fnf) {
+bool mrbesen::files::scan(const std::string& path, fileCallback clb, bool prefixdir, fileNameFilter fnf) {
 	std::string path_ = path;
-	mrbesen::Util::insertEnd(path_, "/");
+	mrbesen::util::insertEnd(path_, "/");
 	
 	::DIR* dir = opendir(path_.c_str());
 	if(!dir) {
diff --git a/src/util.cpp b/src/util.cpp
index 2b1bfc4..60bcdbd 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -2,7 +2,7 @@
 
 #include <algorithm>
 
-unsigned int mrbesen::Util::count(const std::string& str, char c) {
+unsigned int mrbesen::util::count(const std::string& str, char c) {
 	size_t pos = 0;
 	long count = -1;
 	do {
@@ -16,7 +16,7 @@ bool icompare_pred(unsigned char a, unsigned char b) {
 	return std::tolower(a) == std::tolower(b);
 }
 
-bool mrbesen::Util::equalsIgnoreCase(const std::string& a, const std::string& b, size_t max) {
+bool mrbesen::util::equalsIgnoreCase(const std::string& a, const std::string& b, size_t max) {
 	size_t al = a.size(), bl = b.size();
 	if((al == 0 && bl == 0) || max == 0) return true;
 
@@ -34,7 +34,7 @@ bool mrbesen::Util::equalsIgnoreCase(const std::string& a, const std::string& b,
 	}
 }
 
-void mrbesen::Util::toLower(const std::string& in, std::string& out) {
+void mrbesen::util::toLower(const std::string& in, std::string& out) {
 	
 	if(&in == &out) {
 		//wenn beide strings identisch sind, inplace funktion verwenden;
@@ -49,13 +49,13 @@ void mrbesen::Util::toLower(const std::string& in, std::string& out) {
 	}
 }
 
-void mrbesen::Util::toLower(std::string& in) {
+void mrbesen::util::toLower(std::string& in) {
 	for(size_t p = 0; p < in.size(); p++) {
 		in[p] = std::tolower(in[p]);
 	}
 }
 
-bool mrbesen::Util::endsWith(const std::string& str, const std::string& ending) {
+bool mrbesen::util::endsWith(const std::string& str, const std::string& ending) {
 	size_t es = ending.size();
 	size_t ss = str.size();
 	if(es > ss) return false;
@@ -64,14 +64,14 @@ bool mrbesen::Util::endsWith(const std::string& str, const std::string& ending)
 	return str.rfind(ending) == (ss - es);
 }
 
-bool mrbesen::Util::startsWith(const std::string& str, const std::string& start) {
+bool mrbesen::util::startsWith(const std::string& str, const std::string& start) {
 	if(start.size() > str.size()) return false;
 	if(start.size() == 0) return true;
 
 	return str.find(start) == 0;
 }
 
-bool mrbesen::Util::removeEnd(std::string& str, const std::string& ending) {
+bool mrbesen::util::removeEnd(std::string& str, const std::string& ending) {
 	if(ending.empty()) return false;
 	
 	if(endsWith(str, ending)) {
@@ -81,7 +81,7 @@ bool mrbesen::Util::removeEnd(std::string& str, const std::string& ending) {
 	return false;
 }
 
-bool mrbesen::Util::removeStart(std::string& str, const std::string& start) {
+bool mrbesen::util::removeStart(std::string& str, const std::string& start) {
 	if(start.empty()) return false;
 
 	if(startsWith(str, start)) {
@@ -91,7 +91,7 @@ bool mrbesen::Util::removeStart(std::string& str, const std::string& start) {
 	return false;
 }
 
-bool mrbesen::Util::insertEnd(std::string& str, const std::string& ending) {
+bool mrbesen::util::insertEnd(std::string& str, const std::string& ending) {
 	if(ending.empty()) return false;
 
 	if(endsWith(str, ending)) return false;
@@ -100,7 +100,7 @@ bool mrbesen::Util::insertEnd(std::string& str, const std::string& ending) {
 	return true;
 }
 
-bool mrbesen::Util::insertStart(std::string& str, const std::string& start) {
+bool mrbesen::util::insertStart(std::string& str, const std::string& start) {
 	if(start.empty()) return false;
 
 	if(startsWith(str, start)) return false;
@@ -109,7 +109,7 @@ bool mrbesen::Util::insertStart(std::string& str, const std::string& start) {
 	return true;
 }
 
-unsigned int mrbesen::Util::split(const std::string& str, const std::string& token, std::string* out, unsigned int count) {
+unsigned int mrbesen::util::split(const std::string& str, const std::string& token, std::string* out, unsigned int count) {
 	StringSpliterator spl(str, token);
 	for(unsigned int i = 0; i < count; ++i) {
 		out[i] = *spl;
@@ -119,7 +119,7 @@ unsigned int mrbesen::Util::split(const std::string& str, const std::string& tok
 	return count;
 }
 
-void mrbesen::Util::trim(std::string& str, char c) {
+void mrbesen::util::trim(std::string& str, char c) {
 	size_t first = str.find_first_not_of(c);
 	if(first == std::string::npos) {
 		str = "";
@@ -129,7 +129,7 @@ void mrbesen::Util::trim(std::string& str, char c) {
 	str = str.substr(first, last-first);
 }
 
-std::string mrbesen::Util::bytesToBase16(char* buffer, unsigned int len) {
+std::string mrbesen::util::bytesToBase16(char* buffer, unsigned int len) {
 	static const char hexmap[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
 	std::string s(len << 1, ' ');
 	for (unsigned int i = 0; i < len; ++i) {
@@ -139,7 +139,7 @@ std::string mrbesen::Util::bytesToBase16(char* buffer, unsigned int len) {
 	return s;
 }
 
-std::string mrbesen::Util::bytesToBase64(char* buffer, unsigned int len) {
+std::string mrbesen::util::bytesToBase64(char* buffer, unsigned int len) {
 	//from: https://renenyffenegger.ch/notes/development/Base64/Encoding-and-decoding-base-64-with-cpp/index#cpp-base64-cpp
 
 	if(len == 0) return "";
@@ -174,32 +174,32 @@ std::string mrbesen::Util::bytesToBase64(char* buffer, unsigned int len) {
 }
 
 
-mrbesen::Util::StringSpliterator::StringSpliterator(const std::string& d, const std::string& token) : data(d), token(token) {
+mrbesen::util::StringSpliterator::StringSpliterator(const std::string& d, const std::string& token) : data(d), token(token) {
 	//trim
-	while(mrbesen::Util::removeStart(data, token));
-	while(mrbesen::Util::removeEnd(data, token));
+	while(mrbesen::util::removeStart(data, token));
+	while(mrbesen::util::removeEnd(data, token));
 	
 	findNext();
 }
 
-mrbesen::Util::StringSpliterator::~StringSpliterator() {}
+mrbesen::util::StringSpliterator::~StringSpliterator() {}
 
-std::string mrbesen::Util::StringSpliterator::operator*() const {
+std::string mrbesen::util::StringSpliterator::operator*() const {
 	return data.substr(lasttok, (nexttok - lasttok)-token.size());
 }
 
-mrbesen::Util::StringSpliterator& mrbesen::Util::StringSpliterator::operator++() {
+mrbesen::util::StringSpliterator& mrbesen::util::StringSpliterator::operator++() {
 	findNext();
 	return *this;
 }
 
-mrbesen::Util::StringSpliterator mrbesen::Util::StringSpliterator::operator++(int) {
+mrbesen::util::StringSpliterator mrbesen::util::StringSpliterator::operator++(int) {
 	StringSpliterator ret = *this;
 	findNext();
 	return ret;
 }
 
-void mrbesen::Util::StringSpliterator::findNext() {
+void mrbesen::util::StringSpliterator::findNext() {
 	if(!operator bool()) return;
 
 	lasttok = nexttok;
@@ -214,6 +214,6 @@ void mrbesen::Util::StringSpliterator::findNext() {
 		nexttok += token.size();
 }
 
-mrbesen::Util::StringSpliterator::operator bool() const {
+mrbesen::util::StringSpliterator::operator bool() const {
 	return lasttok < data.length() && nexttok >= lasttok;
 }
diff --git a/tests/doytests.cpp b/tests/doytests.cpp
new file mode 100644
index 0000000..c864b0f
--- /dev/null
+++ b/tests/doytests.cpp
@@ -0,0 +1,19 @@
+#include "test.h"
+#include "doy.h"
+
+using namespace mrbesen::doy;
+
+int testGetDoy() {
+
+	//wird nur ohne timezone getestet!
+
+	ASSERT(getDOY(false, 1) == 1, ""); //01.01.1970
+	ASSERT(getDOY(false, 31449600) == 365, ""); //31.12.1970 00:00:00
+	ASSERT(getDOY(false, 31535999) == 365, ""); //31.12.1970 23:59:59
+
+	ASSERT(getDOY(false, 31536000) == 1, ""); //01.01.1971 00:00:00
+
+	ASSERT(getDOY(false, 131284800) == 59, ""); //28.02.1974 12:00:00
+
+	return TESTGOOD;
+}
\ No newline at end of file
diff --git a/tests/filestests.cpp b/tests/filestests.cpp
index 9e59a1b..8f1ef19 100644
--- a/tests/filestests.cpp
+++ b/tests/filestests.cpp
@@ -12,20 +12,20 @@ int testFiles_parent() {
 	std::string out, out2;
 	std::string testpath1 = "/asdf1/asdf2/test.png";
 	
-	Files::parent(testpath1, out);
+	files::parent(testpath1, out);
 	ASSERT(out == "/asdf1/asdf2/", out);
 
-	Files::parent(out, out2);
+	files::parent(out, out2);
 	ASSERT(out2 == "/asdf1/", out2);
 
-	Files::parent(out2, out);
+	files::parent(out2, out);
 	ASSERT(out == "/", out);
 
 	testpath1 = "assets/tex/img1.png";
-	Files::parent(testpath1, out);
+	files::parent(testpath1, out);
 	ASSERT(out == "assets/tex/", out);
 
-	Files::parent("asd", out);
+	files::parent("asd", out);
 	ASSERT(out == "", out);
 
 	return TESTGOOD;
@@ -34,22 +34,22 @@ int testFiles_parent() {
 int testFiles_file() {
 	std::string a;
 
-	Files::file("/abc/def/123.txt", a);
+	files::file("/abc/def/123.txt", a);
 	ASSERT(a == "123.txt", "normalfile" << a);
 
-	Files::file("/abc/def/.gitignore", a);
+	files::file("/abc/def/.gitignore", a);
 	ASSERT(a == ".gitignore", "dotfiles" << a);
 	
-	Files::file("/abc/def/executeable", a);
+	files::file("/abc/def/executeable", a);
 	ASSERT(a == "executeable", "no extention" << a);
 
-	Files::file("123.txt", a);
+	files::file("123.txt", a);
  	ASSERT(a == "123.txt", "normalfile - nopath" << a);
 
-	Files::file(".gitignore", a);
+	files::file(".gitignore", a);
 	ASSERT(a == ".gitignore", "dotfiles - nopath " << a);
 	
-	Files::file("executeable", a);
+	files::file("executeable", a);
 	ASSERT(a == "executeable", "no extention - nopath " << a);
 
 	return TESTGOOD;
@@ -58,46 +58,46 @@ int testFiles_file() {
 int testFiles_extention() {
 	std::string a;
 
-	Files::extention("abc/asd/1.txt", a);
+	files::extention("abc/asd/1.txt", a);
 	ASSERT(a == "txt", a);
 
-	Files::extention("1.txt", a);
+	files::extention("1.txt", a);
 	ASSERT(a == "txt", a);
 
-	Files::extention("/1.txt", a);
+	files::extention("/1.txt", a);
 	ASSERT(a == "txt", "");
 
-	Files::extention("/a.b.c/ad./1.txt", a);
+	files::extention("/a.b.c/ad./1.txt", a);
 	ASSERT(a == "txt", "");
 
-	Files::extention("a.b.c/ad./1.txt", a);
+	files::extention("a.b.c/ad./1.txt", a);
 	ASSERT(a == "txt", "");
 
-	Files::extention("./1.txt", a);
+	files::extention("./1.txt", a);
 	ASSERT(a == "txt", "");
 
-	Files::extention("/a/ad/1", a);
+	files::extention("/a/ad/1", a);
 	ASSERT(a == "", "");
 
-	Files::extention("/a/ad/", a);
+	files::extention("/a/ad/", a);
 	ASSERT(a == "", "");
 
-	Files::extention("/", a);
+	files::extention("/", a);
 	ASSERT(a == "", "");
 
-	Files::extention("/a", a);
+	files::extention("/a", a);
 	ASSERT(a == "", "");
 
-	Files::extention("/a.", a);
+	files::extention("/a.", a);
 	ASSERT(a == "", "");
 
-	Files::extention("/a.b", a);
+	files::extention("/a.b", a);
 	ASSERT(a == "b", "");
 
-	Files::extention("/sad.asd/ab", a);
+	files::extention("/sad.asd/ab", a);
 	ASSERT(a == "", "");
 
-	Files::extention("sad.asd/ab", a);
+	files::extention("sad.asd/ab", a);
 	ASSERT(a == "", "");
 
 	return TESTGOOD;
@@ -108,13 +108,13 @@ int testFiles_scan() {
 	std::string path = "./tests";
 	std::list<std::string> out, out2;
 
-	ASSERT(Files::scan(path, std::inserter(out, out.begin()), false), "");
-	ASSERT(Files::scan(path, std::inserter(out2, out2.begin()), true), "");
+	ASSERT(files::scan(path, std::inserter(out, out.begin()), false), "");
+	ASSERT(files::scan(path, std::inserter(out2, out2.begin()), true), "");
 
 	ASSERT(out.size() == out2.size(), out.size() << " " << out2.size());
 
 	std::set<std::string> out3;
-	ASSERT(Files::scan(path, std::inserter(out3, out3.begin()), false, [](const std::string& str, Files::FileType t){ return mrbesen::Util::startsWith(str, "."); }), "");
+	ASSERT(files::scan(path, std::inserter(out3, out3.begin()), false, [](const std::string& str, files::FileType t){ return mrbesen::util::startsWith(str, "."); }), "");
 	ASSERT(out3.size() == 2, out3.size());
 	ASSERT(out3.find(".") != out3.end(), "");
 	ASSERT(out3.find("..") != out3.end(), "");
diff --git a/tests/main.cpp b/tests/main.cpp
index 29fb975..79c311f 100644
--- a/tests/main.cpp
+++ b/tests/main.cpp
@@ -19,9 +19,12 @@ int testUtil_base();
 int testStringSpliterator();
 int testUtilSplit();
 
+int testGetDoy();
+
 test_t tests[] = {testFiles_parent, testFiles_file, testFiles_extention, testFiles_scan,
 	testUtil_Count, testUtil_equalsIgnoreCase, testUtil_toLower, testUtil_start_endWith, testUtil_removeStart_End, testUtil_insertStart_End, testUtil_trim, testUtil_base,
 	testStringSpliterator, testUtilSplit,
+	testGetDoy,
 	NULL};
 
 int main(int argc, char** argv) {
diff --git a/tests/stringspliteratortest.cpp b/tests/stringspliteratortest.cpp
index f230904..75fd8ab 100644
--- a/tests/stringspliteratortest.cpp
+++ b/tests/stringspliteratortest.cpp
@@ -2,7 +2,7 @@
 
 #include "util.h"
 
-using namespace mrbesen::Util;
+using namespace mrbesen::util;
 
 
 int testStringSpliterator() {
diff --git a/tests/utilstest.cpp b/tests/utilstest.cpp
index 1750d3e..6729e1b 100644
--- a/tests/utilstest.cpp
+++ b/tests/utilstest.cpp
@@ -1,7 +1,7 @@
 #include "util.h"
 #include "test.h"
 
-using namespace mrbesen::Util;
+using namespace mrbesen::util;
 
 int testUtil_Count() {
 	std::string test1 = "ababababa";