1 files changed, 8 insertions, 3 deletions

diff --git a/datetime.h b/datetime.h
index 6f6ad1df..e9f2cd8a 100644
--- a/datetime.h
+++ b/datetime.h
@@ -13,13 +13,18 @@ struct interval_t
   int months;
   int seconds;
 
-  interval_t(int _seconds, int _months = 0, int _years = 0)
+  interval_t(int _seconds = 0, int _months = 0, int _years = 0)
     : years(_years), months(_months), seconds(_seconds) {}
 
+  operator bool() const {
+    return seconds > 0 || months > 0 || years > 0;
+  }
+
   std::time_t increment(const std::time_t);
 
-  static interval_t * parse(std::istream& in, std::time_t * begin,
-			    std::time_t * end);
+  static interval_t parse(std::istream& in,
+			  std::time_t * begin,
+			  std::time_t * end);
 };
 
 extern std::time_t now;