diff --git a/time.c b/time.c
index bcf904bd3b..ac9a13d7fd 100644
--- a/time.c
+++ b/time.c
@@ -4177,12 +4177,6 @@ rb_time_succ(VALUE time)
  *     t.round(2).iso8601(10)  #=> "2010-03-30T05:43:25.1200000000Z"
  *     t.round(3).iso8601(10)  #=> "2010-03-30T05:43:25.1230000000Z"
  *     t.round(4).iso8601(10)  #=> "2010-03-30T05:43:25.1235000000Z"
- *     t.round(5).iso8601(10)  #=> "2010-03-30T05:43:25.1234600000Z"
- *     t.round(6).iso8601(10)  #=> "2010-03-30T05:43:25.1234570000Z"
- *     t.round(7).iso8601(10)  #=> "2010-03-30T05:43:25.1234568000Z"
- *     t.round(8).iso8601(10)  #=> "2010-03-30T05:43:25.1234567900Z"
- *     t.round(9).iso8601(10)  #=> "2010-03-30T05:43:25.1234567890Z"
- *     t.round(10).iso8601(10) #=> "2010-03-30T05:43:25.1234567890Z"
  *
  *     t = Time.utc(1999,12,31, 23,59,59)
  *     (t + 0.4).round.iso8601(3)    #=> "1999-12-31T23:59:59.000Z"
@@ -4249,12 +4243,6 @@ time_round(int argc, VALUE *argv, VALUE time)
  *     t.floor(2).iso8601(10)  #=> "2010-03-30T05:43:25.1200000000Z"
  *     t.floor(3).iso8601(10)  #=> "2010-03-30T05:43:25.1230000000Z"
  *     t.floor(4).iso8601(10)  #=> "2010-03-30T05:43:25.1234000000Z"
- *     t.floor(5).iso8601(10)  #=> "2010-03-30T05:43:25.1234500000Z"
- *     t.floor(6).iso8601(10)  #=> "2010-03-30T05:43:25.1234560000Z"
- *     t.floor(7).iso8601(10)  #=> "2010-03-30T05:43:25.1234567000Z"
- *     t.floor(8).iso8601(10)  #=> "2010-03-30T05:43:25.1234567800Z"
- *     t.floor(9).iso8601(10)  #=> "2010-03-30T05:43:25.1234567890Z"
- *     t.floor(10).iso8601(10) #=> "2010-03-30T05:43:25.1234567890Z"
  *
  *     t = Time.utc(1999,12,31, 23,59,59)
  *     (t + 0.4).floor.iso8601(3)    #=> "1999-12-31T23:59:59.000Z"