You can't cast directly, however you can do the following:

select cast(current_timestamp - cast('12/30/1899' as timestamp) as
integer)
from rdb$database

Subtracting 12/30/1899 will subtract 0 and not alter the date/time you
already have, however it will force the result to be returned as
numeric(18,9) which can then be cast as int.


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