diff --git a/CHANGED b/CHANGED
index 4c0f955c2..0a2c63826 100644
--- a/CHANGED
+++ b/CHANGED
@@ -583,3 +583,4 @@
   - feature: CUL: optional baudrate spec in definition
   - feature: CUL: sendpool attribute
   - feature: CUL_HOERMANN module added
+  - bugfix:  DST change: absolute at and relative sunrise fix
diff --git a/FHEM/90_at.pm b/FHEM/90_at.pm
index 286427db1..62aed421f 100755
--- a/FHEM/90_at.pm
+++ b/FHEM/90_at.pm
@@ -53,7 +53,7 @@ at_Define($$)
   $nt -= ($lt[2]*3600+$lt[1]*60+$lt[0])         # Midnight for absolute time
                         if($rel ne "+");
   $nt += ($hr*3600+$min*60+$sec); # Plus relative time
-  $nt += 86400 if($ot >= $nt);                  # Do it tomorrow...
+  $nt += SecondsTillTomorrow($ot) if($ot >= $nt);  # Do it tomorrow...
   $nt += $at_tdiff if(defined($at_tdiff));
 
   @lt = localtime($nt);
diff --git a/FHEM/99_SUNRISE_EL.pm b/FHEM/99_SUNRISE_EL.pm
index be5659832..6d394b2d9 100755
--- a/FHEM/99_SUNRISE_EL.pm
+++ b/FHEM/99_SUNRISE_EL.pm
@@ -67,11 +67,11 @@ sr($$$$$$)
   if($data{AT_RECOMPUTE} ||                     # compute it for tommorow
      int(($nh-$sst)*3600) >= 0) {               # if called a subsec earlier
     $nt += 86400;
-    $diff = 24;
     @lt = localtime($nt);
-    $gmtoff = _calctz($nt,@lt); # in hour
+    my $ngmtoff = _calctz($nt,@lt); # in hour
+    $diff = 24+$gmtoff-$ngmtoff;
 
-    ($rt,$st) = _sr($needrise,$needset, $lt[5]+1900,$lt[4]+1,$lt[3], $gmtoff);
+    ($rt,$st) = _sr($needrise,$needset, $lt[5]+1900,$lt[4]+1,$lt[3], $ngmtoff);
     $sst = ($rise ? $rt : $st) + ($seconds/3600);
   }
 
diff --git a/fhem.pl b/fhem.pl
index eacd7df8d..12ba01f1f 100755
--- a/fhem.pl
+++ b/fhem.pl
@@ -64,6 +64,7 @@ sub OpenLogfile($);
 sub PrintHash($$);
 sub ResolveDateWildcards($@);
 sub RemoveInternalTimer($);
+sub SecondsTillTomorrow($);
 sub SemicolonEscape($);
 sub SignalHandling();
 sub TimeNow();
@@ -159,13 +160,15 @@ my $nextat;                     # Time when next timer will be triggered.
 my $intAtCnt=0;
 my %duplicate;                  # Pool of received msg for multi-fhz/cul setups
 my $duplidx=0;                  # helper for the above pool
-my $cvsid = '$Id: fhem.pl,v 1.103 2010-03-22 14:31:37 rudolfkoenig Exp $';
+my $cvsid = '$Id: fhem.pl,v 1.104 2010-04-02 14:20:53 rudolfkoenig Exp $';
 my $namedef =
   "where <name> is either:\n" .
   "- a single device name\n" .
   "- a list seperated by komma (,)\n" .
   "- a regexp, if contains one of the following characters: *[]^\$\n" .
   "- a range seperated by dash (-)\n";
+my $stt_sec;                    # Used by SecondsTillTomorrow()
+my $stt_day;                    # Used by SecondsTillTomorrow()
 
 
 $init_done = 0;
@@ -2215,3 +2218,23 @@ AddDuplicate($$)
   $duplicate{$duplidx}{TIM} = gettimeofday();
   $duplidx++;
 }
+
+sub
+SecondsTillTomorrow($)  # 86400, if tomorrow is no DST change
+{
+  my $t = shift;
+  my $day = int($t/86400);
+
+  if(!$stt_day || $day != $stt_day) {
+    my $t = $day*86400+12*3600;
+    my @l1 = localtime($t);
+    my @l2 = localtime($t+86400);
+    $stt_sec = 86400+
+                ($l1[2]-$l2[2])*3600+
+                ($l1[1]-$l2[1])*60;
+    $stt_day = $day;
+  }
+
+  return $stt_sec;
+}
+