gistfile1.diff

diff --git a/lib/chronic/repeaters/repeater_day_portion.rb b/lib/chronic/repeaters/repeater_day_port
index 651cfd0..73f187f 100644
--- a/lib/chronic/repeaters/repeater_day_portion.rb
+++ b/lib/chronic/repeaters/repeater_day_portion.rb
@@ -66,8 +66,13 @@ module Chronic
     def this(context = :future)
       super
 
-      range_start = Chronic.construct(@now.year, @now.month, @now.day) + @range.begin
-      @current_span = Span.new(range_start, range_start + (@range.end - @range.begin))
+      if context == :past
+        range_start = Chronic.construct(@now.year, @now.month, @now.day - 1) + @range.begin
+      else
+        range_start = Chronic.construct(@now.year, @now.month, @now.day) + @range.begin
+      end
+
+      Span.new(range_start, range_start + (@range.end - @range.begin))
     end
 
     def offset(span, amount, pointer)