On Friday 21 April 2006 05:47 pm, Tom Lane <tgl@xxxxxxxxxxxxx> thus communicated: --> Terry Lee Tucker <terry@xxxxxxxx> writes: --> > 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. --> --> Perhaps you should be using a DST-aware timezone specification? Since --> 8.1 you could do --> --> regression=# select timezone ('CST6CDT', '04/21/2006 17:05 EDT'::timestamptz); --> timezone --> --------------------- --> 2006-04-21 16:05:00 --> (1 row) --> --> --> regards, tom lane --> Thanks for the reply Tom. We will be upgrading to version 8.x hopefully in August. I can implement a work around until then. So, when we can upgrade, we will change the timezone specification in the customer profiles to the DST-aware specification, and we will be set.