1 files changed, 31 insertions, 1 deletions
diff --git a/activesupport/CHANGELOG.md b/activesupport/CHANGELOG.md
index 23ca8246e2..2be567c2f7 100644
--- a/activesupport/CHANGELOG.md
+++ b/activesupport/CHANGELOG.md
@@ -1,6 +1,36 @@
+*   Make `getlocal` and `getutc` always return instances of `Time` for
+    `ActiveSupport::TimeWithZone` and `DateTime`. This eliminates a possible
+    stack level too deep error in `to_time` where `ActiveSupport::TimeWithZone`
+    was wrapping a `DateTime` instance. As a consequence of this the internal
+    time value in `ActiveSupport::TimeWithZone` is now always an instance of
+    `Time` in the UTC timezone, whether that's as the UTC time directly or
+    a representation of the local time in the timezone. There should be no
+    consequences of this internal change and if there are it's a bug due to
+    leaky abstractions.
+
+    *Andrew White*
+
+*   Add `DateTime#subsec` to return the fraction of a second as a `Rational`.
+
+    *Andrew White*
+
+*   Add additional aliases for `DateTime#utc` to mirror the ones on
+    `ActiveSupport::TimeWithZone` and `Time`.
+
+    *Andrew White*
+
+*   Add `DateTime#localtime` to return an instance of `Time` in the system's
+    local timezone. Also aliased to `getlocal`.
+
+    *Andrew White*, *Yuichiro Kaneko*
+
+*   Add `Time#sec_fraction` to return the fraction of a second as a `Rational`.
+
+    *Andrew White*
+
 *   Add `ActiveSupport.to_time_preserves_timezone` config option to control
     how `to_time` handles timezones. In Ruby 2.4+ the behavior will change
-    from converting to the local system timezone to preserving the timezone
+    from converting to the local system timezone, to preserving the timezone
     of the receiver. This config option defaults to false so that apps made
     with earlier versions of Rails are not affected when upgrading, e.g: