Produce an output token on each firing with a value that is the current time. The output is of type double.
@author Jie Liu and Edward A. Lee
@version $Id: CurrentTime.java,v 1.51 2005/07/11 16:51:11 cxh Exp $
@since Ptolemy II 0.3
@Pt.ProposedRating Yellow (eal)
@Pt.AcceptedRating Yellow (cxh)
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