Migration from DB2 to PostgreSQL-TIMESTAMP(arg1,arg1)

While migrating my application from DB2 to PostgreSQL.

I want to migrate TIMESTAMP() function of DB2 into PostgreSQL.

Example in DB2:
#SELECT TIMESTAMP('2013-01-01','12:13:14') FROM SYSIBM.SYSDUMMY1

1
--------------------------
2013-01-01-12.13.14.000000

1 record(s) selected.
==========================

Example PostgreSQL:

#SELECT TIMESTAMP('2013-01-01','12:13:14');
ERROR: syntax error at or near "'2013-01-01'" at character 18
STATEMENT: SELECT TIMESTAMP('2013-01-01','12:13:14');
ERROR: syntax error at or near "'2013-01-01'"
LINE 1: SELECT TIMESTAMP('2013-01-01','12:13:14');

After executing above SQL I am getting error.

I checked definition of TIMESTAMP().
It is as follows:
test=# \df timestamp
List of functions
Schema | Name | Result data type | Argument
data types | Type
------------+-----------+-----------------------------+--------------------------------------+--------
pg_catalog | timestamp | timestamp without time zone | abstime
| normal
pg_catalog | timestamp | timestamp without time zone | date
| normal
pg_catalog | timestamp | timestamp without time zone | date, time without
time zone | normal
pg_catalog | timestamp | timestamp without time zone | timestamp without
time zone, integer | normal
pg_catalog | timestamp | timestamp without time zone | timestamp with time
zone | normal
(5 rows)

As we can see TIMESTAMP() hast two arguments date and time without time
stamp but still it is giving error to me.

Please reply if any suggestion.

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