Convert local time to GMT

Hi everybody,
i receive a lot of operation date from many worldwide ports like these:
SINGAPORE 23/FEB/2011 13:50 (local time)
GHENT(NL) 23/FEB/2011 12:00 (local time)
i'm required to convert these information to GMT date.
I've found NEW_TIME function but it seems inadequate:
1) the function does not consider daylight saving periods; i mean when tmz1 switches from daylight savings on to daylight savings off and tmz2 does not, the function does not change the time difference (at least it's the result of my test unless all valid timezones switch at the same time)
2) valid parameters are 18 therefore they don't cover all the possible combinations
Could you please help to cope the matter ?
Many thanks in advance
Stefano

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by David Hsiung ([email protected]):
How can i convert local time to GMT time in
the Form?<HR></BLOCKQUOTE>
David,
there is a date function caled NEW_TIME that should work. For ex:
select to_char(new_time (sysdate, 'EST','GMT'), 'HH:MI:SS')
from dual;
05:31:00

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