3 files changed, 62 insertions, 0 deletions

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