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Jason is a fully-fledged interpreter for an extended version of AgentSpeak, a BDI agent-oriented logic programming language.

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package jason.functions;

import jason.asSemantics.DefaultArithFunction;
import jason.asSemantics.TransitionSystem;
import jason.asSyntax.Term;

/** 
  Function: system.time: encapsulates java System.currentTimeMillis(),
  returns the current time in milliseconds.
  
  @see jason.stdlib.time internal action time

  @author Jomi 
*/
public class time extends DefaultArithFunction  {

    public String getName() {
        return "system.time";
    }
    
    @Override
    public double evaluate(TransitionSystem ts, Term[] args) throws Exception {
        return System.currentTimeMillis();
    }

    @Override
    public boolean checkArity(int a) {
        return a == 0;
    }
    
}