From dd72bed28a2373d1d40432d3c9417e9c71b4f463 Mon Sep 17 00:00:00 2001
From: Paul Beckingham <paul@beckingham.net>
Date: Mon, 30 May 2016 14:04:49 -0400
Subject: [PATCH] ISO8601: Added ::sameQuarter

---
 src/ISO8601.cpp |  7 +++++++
 src/ISO8601.h   | 31 ++++++++++++++++---------------
 2 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/src/ISO8601.cpp b/src/ISO8601.cpp
index 2edf511af..8a94621b5 100644
--- a/src/ISO8601.cpp
+++ b/src/ISO8601.cpp
@@ -1574,6 +1574,13 @@ bool ISO8601d::sameMonth (const ISO8601d& rhs) const
          this->month () == rhs.month ();
 }
 
+////////////////////////////////////////////////////////////////////////////////
+bool ISO8601d::sameQuarter (const ISO8601d& rhs) const
+{
+  return (this->year () == rhs.year ()) &&
+         ((this->month () - 1) / 4) == ((rhs.month () - 1) / 4);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 bool ISO8601d::sameYear (const ISO8601d& rhs) const
 {
diff --git a/src/ISO8601.h b/src/ISO8601.h
index c7b7cd027..b3f82e5aa 100644
--- a/src/ISO8601.h
+++ b/src/ISO8601.h
@@ -86,26 +86,27 @@ public:
   int minute () const;
   int second () const;
 
-  bool operator== (const ISO8601d&) const;
-  bool operator!= (const ISO8601d&) const;
-  bool operator<  (const ISO8601d&) const;
-  bool operator>  (const ISO8601d&) const;
-  bool operator<= (const ISO8601d&) const;
-  bool operator>= (const ISO8601d&) const;
-  bool sameHour   (const ISO8601d&) const;
-  bool sameDay    (const ISO8601d&) const;
-  bool sameWeek   (const ISO8601d&) const;
-  bool sameMonth  (const ISO8601d&) const;
-  bool sameYear   (const ISO8601d&) const;
+  bool operator==  (const ISO8601d&) const;
+  bool operator!=  (const ISO8601d&) const;
+  bool operator<   (const ISO8601d&) const;
+  bool operator>   (const ISO8601d&) const;
+  bool operator<=  (const ISO8601d&) const;
+  bool operator>=  (const ISO8601d&) const;
+  bool sameHour    (const ISO8601d&) const;
+  bool sameDay     (const ISO8601d&) const;
+  bool sameWeek    (const ISO8601d&) const;
+  bool sameMonth   (const ISO8601d&) const;
+  bool sameQuarter (const ISO8601d&) const;
+  bool sameYear    (const ISO8601d&) const;
   ISO8601d operator+  (const int);
   ISO8601d operator-  (const int);
   ISO8601d& operator+= (const int);
   ISO8601d& operator-= (const int);
   time_t operator- (const ISO8601d&);
-  void operator-- ();    // Prefix
-  void operator-- (int); // Postfix
-  void operator++ ();    // Prefix
-  void operator++ (int); // Postfix
+  void operator--  ();    // Prefix
+  void operator--  (int); // Postfix
+  void operator++  ();    // Prefix
+  void operator++  (int); // Postfix
 
 private:
   void clear ();