Date string to UNIX time in SWI Prolog?

From: Michael David Pedersen (mdp_at_cs.auc.dk)
Date: 05/24/04 

Date: Mon, 24 May 2004 16:43:23 +0200

Hi all,

I am in desperate need of a way to translate a ISO 8601 date string in the
format 'YYYYMMDD' to the corresponding UNIX time stamp (i.e. seconds since
January 1st 1970.

The only relevant predicates which SWI seems to offer are:

convert_time(+Time, -Year, -Month, -Day, -Hour, -Minute, -Second, -MilliSeco
nds) and
convert_time(+Time, -String)

But these only allow converting from a unix time to some other
representation! I need to go the other way around, and I would like to avoid
writing this code my self (taking leap years into accound etc.). What to do?

One (unclean) solution is to use shell(+Command, -Status) to call an
external shell command which handles the conversion. If this is the best way
out, how would I go about receiving a return value?

Hope that someone has an answer -- any help will be greatly appreciated.

Regards,
Michael.

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