The new timezone field in the user class is currently a
number specifying the timezone. A drawback is that the
user would have to edit this information on every
daylight savings change. The field should be changed so
that is uses symbolic information for the timezone that
is independent of daylight savings information. Either
allow a numeric value for backward compatibilty or
change the semantics of the timezone field.

Logged In: YES 
user_id=94539

I had to look at the source code to figure out what I was
supposed to enter. This patch in
round-0.6.3/templates/classic/html/user.item.html might be
useful until the timezone can take symbolic options.

[epperly@cca-forum html]$ diff -c user.item.html.bak
user.item.html
*** user.item.html.bak	2003-11-18 14:47:25.000000000 -0800
--- user.item.html	2003-11-18 14:47:40.000000000 -0800
***************
*** 59,65 ****
    <td tal:content="structure
context/organisation/field">organisation</td>
   </tr>
   <tr>
!   <th>Timezone</th>
    <td tal:content="structure
context/timezone/field">timezone</td>
   </tr>
   <tr>
--- 59,65 ----
    <td tal:content="structure
context/organisation/field">organisation</td>
   </tr>
   <tr>
!   <th>Timezone (UTC offset in hours)</th>
    <td tal:content="structure
context/timezone/field">timezone</td>
   </tr>
   <tr>

Current roundup support this with the help of pytz.