Re: [Help-glpk] Time conversion functions

[Xypron]

Andrew Makhorin wrote:
> Xypron,
>
> 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
http://www.netlib.org/ampl/looping/NEW_CMDS

        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

Xypron