SHOW datestyle;

 DateStyle 
-----------
 ISO,MDY
(1 row)

INSERT INTO container VALUES ('13/01/2010');
ERROR:  date/time field value out of range: "13/01/2010"
HINT:  Perhaps you need a different "datestyle" setting.

SET datestyle = "ISO,DMY";
SET

INSERT INTO container VALUES ('13/01/2010');
INSERT 0 1

SET datestyle = default;
SET

http://www.postgresql.org/docs/current/static/runtime-config-client.html#GUC-DATESTYLE

DateStyle – Sets the display format
for date and time values,as well as
the rules for interpreting ambiguous
date input values.
For historical reasons,this variable
contains two independent components:
the output format specification (ISO,
Postgres,sql,or German) and the
input/output specification for
year/month/day ordering (DMY,MDY,or
YMD).

当然最好使用明确的输入格式(ISO 8601)，但根据需要进行调整是没有问题的。