==== Errors ====

when calling http://enquetes.postgresql.fr//admin/install/index.php

i got the following errors :

Executing.....ALTER TABLE lime_surveys ALTER COLUMN "startdate" timestamp...Failed! Reason: ERROR: syntax error at or near "timestamp" LINE 1: ALTER TABLE lime_surveys ALTER COLUMN "startdate" timestamp ^
Executing.....ALTER TABLE lime_surveys ALTER COLUMN "expires" timestamp...Failed! Reason: ERROR: syntax error at or near "timestamp" LINE 1: ALTER TABLE lime_surveys ALTER COLUMN "expires" timestamp ^

==== Location of the bug ====

the bug is in admin/update/upgrade-postgres.php lines 182-183:
modify_database("", "ALTER TABLE prefix_surveys ALTER COLUMN \"startdate\" timestamp"); echo $modifyoutput; flush();
modify_database("", "ALTER TABLE prefix_surveys ALTER COLUMN \"expires\" timestamp"); echo $modifyoutput; flush();

==== Correction ====

The proper PostgreSQL syntax would be :

ALTER TABLE prefix_surveys ALTER COLUMN "startdate" TYPE timestamp;
ALTER TABLE prefix_surveys ALTER COLUMN "expires" TYPE timestamp;