diff --git a/Graphs/gYAxis.cpp b/Graphs/gYAxis.cpp
index a1067cda..0c8e5b2b 100644
--- a/Graphs/gYAxis.cpp
+++ b/Graphs/gYAxis.cpp
@@ -68,7 +68,9 @@ void gYAxis::Plot(gGraphWindow &w,float scrx,float scry)
 
     glColor4ub(linecol1.red(),linecol1.green(),linecol1.blue(),linecol1.alpha());
     glLineWidth(1);
-
+    if (min_ytick>=1000000) {
+        min_ytick=100;
+    }
 
     for (double i=miny+(min_ytick/2.0); i<maxy; i+=min_ytick) {
         ty=(i - miny) * ymult;
diff --git a/Graphs/graphdata_custom.cpp b/Graphs/graphdata_custom.cpp
index 58525b6f..e83b0d59 100644
--- a/Graphs/graphdata_custom.cpp
+++ b/Graphs/graphdata_custom.cpp
@@ -373,7 +373,12 @@ void HistoryData::ResetDateRange()
 }
 double HistoryData::Calc(Day *day)
 {
-    return (day->summary_sum(CPAP_Obstructive) + day->summary_sum(CPAP_Hypopnea) + day->summary_sum(CPAP_ClearAirway)) / day->hours();
+    double h=day->hours();
+    double ahi=(day->summary_sum(CPAP_Obstructive) + day->summary_sum(CPAP_Hypopnea) + day->summary_sum(CPAP_ClearAirway)) / h;
+    if (ahi>1000) {
+        ahi=999;
+    }
+    return ahi;
 }
 
 void HistoryData::Reload(Day *day)
diff --git a/SleepLib/day.h b/SleepLib/day.h
index e9af086a..ed304219 100644
--- a/SleepLib/day.h
+++ b/SleepLib/day.h
@@ -46,7 +46,7 @@ public:
     qint64 last() { return d_last; };
 
     qint64 total_time(); // in milliseconds
-    float hours() { return total_time()/3600000.0; };
+    double hours() { return double(total_time())/3600000.0; };
 
     Session *operator [](int i) { return sessions[i]; };
 
diff --git a/daily.cpp b/daily.cpp
index 8c76768c..097d85a2 100644
--- a/daily.cpp
+++ b/daily.cpp
@@ -554,7 +554,7 @@ void Daily::Load(QDate date)
         QDateTime date=QDateTime::fromMSecsSinceEpoch(cpap->first());
         QDateTime date2=QDateTime::fromMSecsSinceEpoch(cpap->last());
 
-        html+="<tr><td align='center'>"+date.toString(Qt::SystemLocaleShortDate)+"</td><td align='center'>"+date.toString("HH:mm")+"</td><td align='center'>"+date2.toString("HH:mm")+"</td><td align='center'>"+a.sprintf("%02i:%02i",tt/3600,tt%60)+"</td></tr>\n";
+        html+="<tr><td align='center'>"+date.date().toString(Qt::SystemLocaleShortDate)+"</td><td align='center'>"+date.toString("HH:mm")+"</td><td align='center'>"+date2.toString("HH:mm")+"</td><td align='center'>"+a.sprintf("%02i:%02i",tt/3600,tt%60)+"</td></tr>\n";
         html+="<tr><td colspan=4 align=center><hr></td></tr>\n";
 
         QString cs;