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-rw-r--r--activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb3
1 files changed, 2 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb b/activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb
index 9ccbf71159..34e2276dd1 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/oid/date_time.rb
@@ -11,7 +11,8 @@ module ActiveRecord
when 'infinity' then ::Float::INFINITY
when '-infinity' then -::Float::INFINITY
when / BC$/
- super("-" + value.sub(/ BC$/, ""))
+ astronomical_year = format("%04d", -value[/^\d+/].to_i + 1)
+ super(value.sub(/ BC$/, "").sub(/^\d+/, astronomical_year))
else
super
end