From 785b46594804941fd65c84b39c6fe833fd7ef3ba Mon Sep 17 00:00:00 2001
From: Chris Frey <cdfrey@foursquare.net>
Date: Thu, 24 May 2012 01:14:59 -0400
Subject: [PATCH] lib: added DaysInMonth() utility function

---
 src/time.cc | 28 ++++++++++++++++++++++++++++
 src/time.h  |  3 +++
 2 files changed, 31 insertions(+)

diff --git a/src/time.cc b/src/time.cc
index 6185e541..53990698 100644
--- a/src/time.cc
+++ b/src/time.cc
@@ -259,6 +259,34 @@ struct timespec* ThreadTimeout(int timeout_ms, struct timespec *spec)
 	return spec;
 }
 
+//
+// DaysInMonth
+//
+/// Returns the number of days in the month, given the tm_mon and tm_year
+/// as specified in the struct tm argument.  It _does_ take leap year into
+/// account.
+///
+BXEXPORT int DaysInMonth(struct tm &t)
+{
+	int year = t.tm_year + 1900;
+
+	switch( t.tm_mon )
+	{
+	case 1:
+		if( year % 400 == 0 || (year % 100 != 0 && year % 4 == 0) )
+			return 29;
+		else
+			return 28;
+	case 4:
+	case 6:
+	case 9:
+	case 11:
+		return 30;
+	default:
+		return 31;
+	}
+}
+
 
 
 } // namespace Barry
diff --git a/src/time.h b/src/time.h
index a1e9ef81..bf759f3e 100644
--- a/src/time.h
+++ b/src/time.h
@@ -86,6 +86,9 @@ BXEXPORT time_t Message2Time(uint16_t r_date, uint16_t r_time);
 // Thread timeout creation
 BXEXPORT struct timespec* ThreadTimeout(int timeout_ms, struct timespec *spec);
 
+// Utility functions
+BXEXPORT int DaysInMonth(struct tm &t);
+
 } // namespace Barry
 
 #endif
-- 
2.11.4.GIT