On Friday 21 April 2006 05:47 pm, Tom Lane <[EMAIL PROTECTED]> thus 
communicated:
--> Terry Lee Tucker <[EMAIL PROTECTED]> 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.

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