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Re: [Help-glpk] Time conversion functions

From: Xypron
Subject: Re: [Help-glpk] Time conversion functions
Date: Thu, 20 Nov 2008 01:13:50 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20081030 SeaMonkey/1.1.13

Andrew Makhorin wrote:

Thank you for your efforts.

I will try to summarize our proposals and prepare some more or less
detailed description of all new built-in functions to be added to the
language. It will take several days, I hope.

BTW, do you know how this feature is implemented in AMPL? I could not
find anything in the internet.

Andrew Makhorin

Hello Andrew,

I found the following in
Robert Fourer, Ampl: A Modeling Language for Mathematical Programming, 2002

p 458, Table A2: Build-in arithmetic functions
ctime() - current time as string
ctime(t) - time t as string
time - current time in seconds

Further information can be found at

        ctime() = ctime(time()) = current time, a string formatted as in
                                #       'Sat Jul 27 23:37:43 1996'
                                # time() = current time in seconds (numeric)
                                # from a system-dependent origin, shown by
                                # ctime(0) (often 1 January 1970 GMT).

Time formats differ vastly. Hence I guest implementing a function which allow to parse many different formats is crucial. This is why I used a second parameter to specify the format. The time format provided by AMPL does not conform with ISO 8601 and might therefore not be usable for further processing.

Best regards


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