diff --git a/chrono_io.h b/chrono_io.h
index b370270..f08650f 100644
--- a/chrono_io.h
+++ b/chrono_io.h
@@ -3,7 +3,7 @@
 
 // The MIT License (MIT)
 //
-// Copyright (c) 2016 Howard Hinnant
+// Copyright (c) 2016, 2017 Howard Hinnant
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
diff --git a/iso_week.h b/iso_week.h
index 62b2d6a..3e76a15 100644
--- a/iso_week.h
+++ b/iso_week.h
@@ -3,7 +3,7 @@
 
 // The MIT License (MIT)
 //
-// Copyright (c) 2015, 2016 Howard Hinnant
+// Copyright (c) 2015, 2016, 2017 Howard Hinnant
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
diff --git a/tz.cpp b/tz.cpp
index 4981562..83430a9 100644
--- a/tz.cpp
+++ b/tz.cpp
@@ -1,10 +1,11 @@
 // The MIT License (MIT)
 //
-// Copyright (c) 2015, 2016 Howard Hinnant
+// Copyright (c) 2015, 2016, 2017 Howard Hinnant
 // Copyright (c) 2015 Ville Voutilainen
 // Copyright (c) 2016 Alexander Kormanovsky
 // Copyright (c) 2016, 2017 Jiangang Zhuang
 // Copyright (c) 2017 Nicolas Veloz Savino
+// Copyright (c) 2017 Florian Dang
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
diff --git a/tz.h b/tz.h
index 10ec2a1..5c285b8 100644
--- a/tz.h
+++ b/tz.h
@@ -3,7 +3,7 @@
 
 // The MIT License (MIT)
 //
-// Copyright (c) 2015, 2016 Howard Hinnant
+// Copyright (c) 2015, 2016, 2017 Howard Hinnant
 // Copyright (c) 2017 Jiangang Zhuang
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy