1 files changed, 6 insertions, 7 deletions
diff --git a/balance.cc b/balance.cc
index 3422a4e7..3d31bc5d 100644
--- a/balance.cc
+++ b/balance.cc
@@ -33,7 +33,7 @@ amount_t balance_t::amount(const commodity_t& commodity) const
   return amount_t();
 }
 
-balance_t balance_t::value(const datetime_t& moment) const
+balance_t balance_t::value(const ptime& moment) const
 {
   balance_t temp;
 
@@ -57,20 +57,19 @@ balance_t balance_t::price() const
   return temp;
 }
 
-datetime_t balance_t::date() const
+ptime balance_t::date() const
 {
-  datetime_t temp;
+  ptime temp;
 
   for (amounts_map::const_iterator i = amounts.begin();
        i != amounts.end();
        i++) {
-    datetime_t tdate = (*i).second.date();
-    if (! temp && tdate)
+    ptime tdate = (*i).second.date();
+    if (temp.is_not_a_date_time() && ! tdate.is_not_a_date_time())
       temp = tdate;
     else if (temp != tdate)
-      return datetime_t();
+      return ptime();
   }
-
   return temp;
 }