From 6d6cca7830ed931198cd2df77bafbdd81038171a Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Mon, 31 Aug 2009 22:40:57 +0000
Subject: Added a getDaysInMonth function, it'll live in util.{cpp,h} until I
 create an actual Date class.

---
 src/tests/daysinmonth.cpp | 16 ++++++++++++++++
 src/util.cpp              | 40 ++++++++++++++++++++++++++++++++++++++++
 src/util.h                |  6 ++++++
 3 files changed, 62 insertions(+)
 create mode 100644 src/tests/daysinmonth.cpp

diff --git a/src/tests/daysinmonth.cpp b/src/tests/daysinmonth.cpp
new file mode 100644
index 0000000..9888844
--- /dev/null
+++ b/src/tests/daysinmonth.cpp
@@ -0,0 +1,16 @@
+#include "bu/sio.h"
+#include "bu/util.h"
+
+using namespace Bu;
+
+int main()
+{
+	for( int j = 0; j < 12; j++ )
+	{
+		sio << "2012-" << j << " = "
+			<< getDaysInMonth( j, 2012 ) << sio.nl;
+	}
+
+	return 0;
+}
+
diff --git a/src/util.cpp b/src/util.cpp
index 111574c..3ca711d 100644
--- a/src/util.cpp
+++ b/src/util.cpp
@@ -1 +1,41 @@
 #include "bu/util.h"
+
+int Bu::getDaysInMonth( int iMonth, int iYear )
+{
+	if( iMonth > 11 )
+	{
+		iYear += iMonth/12;
+		iMonth = iMonth%12;
+	}
+	switch( iMonth )
+	{
+	case 0:
+	case 2:
+	case 4:
+	case 6:
+	case 7:
+	case 9:
+	case 11:
+		return 31;
+		break;
+
+	case 3:
+	case 5:
+	case 8:
+	case 10:
+		return 30;
+		break;
+
+	case 1:
+		if( iYear%400 == 0 )
+			return 29;
+		if( iYear%100 == 0 )
+			return 28;
+		if( iYear%4 == 0 )
+			return 29;
+		return 28;
+		break;
+	}
+
+}
+
diff --git a/src/util.h b/src/util.h
index 0c2f0eb..c284880 100644
--- a/src/util.h
+++ b/src/util.h
@@ -167,6 +167,12 @@ namespace Bu
 			return *a > *b;
 		}
 	};
+
+	/**
+	 * Get the number of days in the month in the gregorian calendar, taking
+	 * leap years into account.
+	 */
+	int getDaysInMonth( int iMonth, int iYear );
 };
 
 #endif
-- 
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