diff --git a/lib/xsd/datatypes.rb b/lib/xsd/datatypes.rb
index 0e9669c..61060ac 100644
--- a/lib/xsd/datatypes.rb
+++ b/lib/xsd/datatypes.rb
@@ -655,7 +655,7 @@ def _to_s
   	s << ".#{ @secfrac }"
       else
 	s << sprintf("%.16f",
-          (@data.sec_fraction * DayInSec).to_f).sub(/^0/, '').sub(/0*$/, '')
+          @data.sec_fraction.to_f).sub(/^0/, '').sub(/0*$/, '')
       end
     end
     add_tz(s)
@@ -705,7 +705,7 @@ def _to_s
   	s << ".#{ @secfrac }"
       else
 	s << sprintf("%.16f",
-          (@data.sec_fraction * DayInSec).to_f).sub(/^0/, '').sub(/0*$/, '')
+          @data.sec_fraction.to_f).sub(/^0/, '').sub(/0*$/, '')
       end
     end
     add_tz(s)