Hello List: I need to know if there is a convienient way of establishing whether DST is active within a function dealing with adjusting timestamps to other time zones. The problem is that if I have the following timestamp: '04/21/2006 17:05 EDT' and I use the timezone() function in the following manner: return (timezone ('CST', '04/21/2006 17:05 EDT') I get a two hour difference in time. Note that neither of the two arguments are hard coded as this example. The "CST" value is stored in the customer profile because that is their time zone and the timestamp is generated from argeuments passed into the function. This is: rnd=# select version(); version -------------------------------------------------------------------------------------------------------------- PostgreSQL 7.4.6 on i686-redhat-linux-gnu, compiled by GCC gcc (GCC) 3.2.3 20030502 (Red Hat Linux 3.2.3-49) TIA