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-rw-r--r--activesupport/lib/active_support/core_ext/date/conversions.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/core_ext/date/conversions.rb b/activesupport/lib/active_support/core_ext/date/conversions.rb
index ed8bca77ac..9a6d7bb415 100644
--- a/activesupport/lib/active_support/core_ext/date/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/date/conversions.rb
@@ -80,6 +80,7 @@ class Date
#
# date.to_time(:utc) # => 2007-11-10 00:00:00 UTC
def to_time(form = :local)
+ raise ArgumentError, "Expected :local or :utc, got #{form.inspect}." unless [:local, :utc].include?(form)
::Time.send(form, year, month, day)
end