Manipulate GamaDate in milliseconds level

[saad touhbi]

Is it possible to manipulate GamaDate to milliseconds level?

• create a new date with milliseconds value
  
• compare two dates considering milliseconds value.
  
• get current simulation date with milliseconds.

I am trying to generating  agents depending on a schedule that would be up to milliseconds. however the current date of the simulation that i get does not give me access to milliseconds in order for me to do so.

Thanks

[Alexis Drogoul (IRD)]

Hi,

Yes this is possible. But, before answering, let me put one thing straight: milliseconds can be (1) a measure of duration, not something used to define a date; (2) the number of milliseconds present in one date as a field (like the number of seconds, minutes, hours, etc. in that date). 

All models come with two default variables: starting_date and current_date. Yo can redefine the first one, for example if you want to start a simulation at a given date. Various operators allow you to handle their modification (adding durations, etc.), incl. arithmetic operators (i.e. you can write date2 <- date1 + 1 #month + 23 #ms).

Some pseudo-constants also exist, like #now (which gives the current « machine » date) or #epoch (which gives the default starting date of models when none is defined, and which can be changed in the preferences — by default it is the 1st of January 1970, like in Java). 

Now, to answer your questions: 

1)  • create a new date with milliseconds value : I dont really understand what this means. You cannot create a date from a duration, unless you have some sort of starting point (in which, your date would be x milliseconds after the starting point, maybe, if this is what you intend to obtain ?). For instance, date d1 <- starting_date plus_ms 100; could give you a date after 100ms of the starting date of the model; or date d2 <- #now plus_ms 1000; would give you a date ahead of 1s after the current machine date.

2)  • compare two dates considering milliseconds value: again, you have to make it clearer. Do you want to obtain the difference (i.e. duration) of two dates in milliseconds (in which case, milliseconds_between(d1,d2) is your friend) or do you want to compare the values of the milliseconds field of each date ? 

3)  • get current simulation date with milliseconds. Again, it does not mean anything by itself, unless you mean the duration in milliseconds from a given starting date (for instance, milliseconds_between(d1, starting_date) will give you the amount of milliseconds between your date and the starting_date of the model). 

Please tell me if I answered your questions or not — and in that case, please precise them (maybe with examples).

Cheers

Alexis

—
Representative of IRD in Vietnam and Philippines http://en.vietnam.ird.fr  

Senior Researcher, co-director, UMI UMMISCO 209, IRD & UPMC, France. http://ummisco.fr 

Director, ICTLab, USTH, Hanoi, Vietnam http://ictlab.usth.edu.vn 

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[saad touhbi]

Hi,

Thanks for the info on how to use milliseconds in models. I am actually talking about manipulating the class GamaDate while developping a plugin. 

I have many agents that I want to schedule to appear according to a timeTable. First thing is that i couldn't assign a date to a level of milliseconds to each agent arrival. I suppose this could be done by this taking a date x and using the method plus like this :

x.plus(Duration.ofMillis(( 100));

Now that I have a timeTable, I try to use it on an actions that would be called in a reflex. So I try to get the current_date in the simulation

GamaDate now = scope.getExperiment().getSimulation().getCurrentDate();

comparing the current date (now) with a date in my timeTable is a bit difficult. I used 

now.equals(mydate) and it seems like it only compares the two on a second level.

 Would you suggest a way to compare the two dates according to my criteria?

[saad touhbi]

No solution here ?

Could you at least tell me how to convert a date to milliseconds in the GamaDate Class.