diff --git a/inc/freebusy-GET.php b/inc/freebusy-GET.php
index 99fe5977..3dbcc392 100644
--- a/inc/freebusy-GET.php
+++ b/inc/freebusy-GET.php
@@ -73,11 +73,13 @@ foreach( $busy_tentative AS $k => $v ) {
     while ( $date = $rrule->GetNext() ) {
       if ( ! $date->GreaterThan($start) ) continue;
       if ( $date->GreaterThan($finish) ) break;
-      $freebusy .= sprintf("FREEBUSY;FBTYPE=BUSY-TENTATIVE:%s/%s\n", $date->Render('Ymd\THis'), $duration );
+      $todate = clone($date);
+      $todate->AddDuration($duration);
+      $freebusy .= sprintf("FREEBUSY;FBTYPE=BUSY-TENTATIVE:%s/%s\n", $date->Render('Ymd\THis'), $todate->Render('Ymd\THis') );
     }
   }
   else {
-    $freebusy .= sprintf("FREEBUSY;FBTYPE=BUSY-TENTATIVE:%s/%s\n", $start->Render('Ymd\THis'), $duration );
+    $freebusy .= sprintf("FREEBUSY;FBTYPE=BUSY-TENTATIVE:%s/%s\n", $v->start, $v->finish );
   }
 }
 
@@ -89,11 +91,13 @@ foreach( $busy AS $k => $v ) {
     while ( $date = $rrule->GetNext() ) {
       if ( ! $date->GreaterThan($start) ) continue;
       if ( $date->GreaterThan($finish) ) break;
-      $freebusy .= sprintf("FREEBUSY:%s/%s\n", $date->Render('Ymd\THis'), $duration );
+      $todate = clone($date);
+      $todate->AddDuration($duration);
+      $freebusy .= sprintf("FREEBUSY:%s/%s\n", $date->Render('Ymd\THis'), $todate->Render('Ymd\THis') );
     }
   }
   else {
-    $freebusy .= sprintf("FREEBUSY:%s/%s\n", $start->Render('Ymd\THis'), $duration );
+    $freebusy .= sprintf("FREEBUSY:%s/%s\n", $v->start, $v->finish );
   }
 }
 
diff --git a/testing/tests/regression-suite/832-freebusy.result b/testing/tests/regression-suite/832-freebusy.result
index 0bc71443..565b1ab7 100644
--- a/testing/tests/regression-suite/832-freebusy.result
+++ b/testing/tests/regression-suite/832-freebusy.result
@@ -1,6 +1,6 @@
 HTTP/1.1 200 OK
 Date: Dow, 01 Jan 2000 00:00:00 GMT
-Content-Length: 1922
+Content-Length: 2476
 Content-Type: text/calendar
 
 BEGIN:VCALENDAR
@@ -10,60 +10,60 @@ BEGIN:VFREEBUSY
 DTSTAMP:yyyymmddThhmmssZ
 DTSTART:yyyymmddThhmmss
 DTEND:yyyymmddThhmmss
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+FREEBUSY:20061117T030000/20061117T040500
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+FREEBUSY:20070629T030000/20070629T040500
+FREEBUSY:20061223T000000/20061223T020000
+FREEBUSY:20061223T030000/20061223T050000
 END:VFREEBUSY
 END:VCALENDAR
diff --git a/testing/tests/regression-suite/833-freebusy.result b/testing/tests/regression-suite/833-freebusy.result
index 0bc71443..565b1ab7 100644
--- a/testing/tests/regression-suite/833-freebusy.result
+++ b/testing/tests/regression-suite/833-freebusy.result
@@ -1,6 +1,6 @@
 HTTP/1.1 200 OK
 Date: Dow, 01 Jan 2000 00:00:00 GMT
-Content-Length: 1922
+Content-Length: 2476
 Content-Type: text/calendar
 
 BEGIN:VCALENDAR
@@ -10,60 +10,60 @@ BEGIN:VFREEBUSY
 DTSTAMP:yyyymmddThhmmssZ
 DTSTART:yyyymmddThhmmss
 DTEND:yyyymmddThhmmss
-FREEBUSY;FBTYPE=BUSY-TENTATIVE:20061223T060000/PT2H
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+FREEBUSY;FBTYPE=BUSY-TENTATIVE:20061223T060000/20061223T080000
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+FREEBUSY:20061223T000000/20061223T020000
+FREEBUSY:20061223T030000/20061223T050000
 END:VFREEBUSY
 END:VCALENDAR
diff --git a/testing/tests/regression-suite/835-freebusy.result b/testing/tests/regression-suite/835-freebusy.result
index cd5fca33..9763b5f7 100644
--- a/testing/tests/regression-suite/835-freebusy.result
+++ b/testing/tests/regression-suite/835-freebusy.result
@@ -1,6 +1,6 @@
 HTTP/1.1 200 OK
 Date: Dow, 01 Jan 2000 00:00:00 GMT
-Content-Length: 1892
+Content-Length: 2435
 Content-Type: text/calendar
 
 BEGIN:VCALENDAR
@@ -10,59 +10,59 @@ BEGIN:VFREEBUSY
 DTSTAMP:yyyymmddThhmmssZ
 DTSTART:yyyymmddThhmmss
 DTEND:yyyymmddThhmmss
-FREEBUSY;FBTYPE=BUSY-TENTATIVE:20061223T060000/PT2H
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+FREEBUSY:20070629T030000/20070629T040500
+FREEBUSY:20061223T030000/20061223T050000
 END:VFREEBUSY
 END:VCALENDAR
diff --git a/testing/tests/regression-suite/836-freebusy.result b/testing/tests/regression-suite/836-freebusy.result
index cd5fca33..9763b5f7 100644
--- a/testing/tests/regression-suite/836-freebusy.result
+++ b/testing/tests/regression-suite/836-freebusy.result
@@ -1,6 +1,6 @@
 HTTP/1.1 200 OK
 Date: Dow, 01 Jan 2000 00:00:00 GMT
-Content-Length: 1892
+Content-Length: 2435
 Content-Type: text/calendar
 
 BEGIN:VCALENDAR
@@ -10,59 +10,59 @@ BEGIN:VFREEBUSY
 DTSTAMP:yyyymmddThhmmssZ
 DTSTART:yyyymmddThhmmss
 DTEND:yyyymmddThhmmss
-FREEBUSY;FBTYPE=BUSY-TENTATIVE:20061223T060000/PT2H
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 END:VFREEBUSY
 END:VCALENDAR