From ed2cf991f36e25b26f46eaf17a83e565b8a739d1 Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Sat, 26 Sep 2015 15:38:25 -0400
Subject: [PATCH] ISO8601d: Added ::operator-

---
 src/ISO8601.cpp | 6 ++++++
 src/ISO8601.h   | 1 +
 2 files changed, 7 insertions(+)

diff --git a/src/ISO8601.cpp b/src/ISO8601.cpp
index 8a4db0462..eed021304 100644
--- a/src/ISO8601.cpp
+++ b/src/ISO8601.cpp
@@ -1135,6 +1135,12 @@ ISO8601d ISO8601d::operator+ (const int delta)
   return ISO8601d (_date + delta);
 }
 
+////////////////////////////////////////////////////////////////////////////////
+ISO8601d ISO8601d::operator- (const int delta)
+{
+  return ISO8601d (_date - delta);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 void ISO8601p::clear ()
 {
diff --git a/src/ISO8601.h b/src/ISO8601.h
index d9dd25462..224cf9659 100644
--- a/src/ISO8601.h
+++ b/src/ISO8601.h
@@ -79,6 +79,7 @@ public:
   bool sameYear   (const ISO8601d&) const;
 
   ISO8601d operator+  (const int);
+  ISO8601d operator-  (const int);
 
 private:
   void clear ();