Question

I have a database field of type time with time zone. How can I query this field in EST5EDT time zone with the output format hh:mm:ss?

All I can find is using multiple calls to EXTRACT:

SELECT EXTRACT(HOUR FROM TIME WITH TIME ZONE '20:38:40-07' AT TIME ZONE 'EST5EDT');

[Edit:]

To be clear, this query:

SELECT TIME WITH TIME ZONE '20:38:40.001-07' AT TIME ZONE 'EST5EDT';

Returns “22:38:40.001” but I just want “22:38:40” as the output.

Answer 1

Use the TO_CHAR() function:

SELECT TO_CHAR(date '2001-09-28' +time, 'HH24:MI:SS')

Seeing that TO_CHAR only accepts the timestamp datatype, you need to concatentate an arbitrary date value to your time value.