In recent CVS, the zero point of time coordinates was changed from "1-Jan-2000" to "1-Jan-1970". I often used raw seconds from "1-Jan-2000" as the time axis value in binary data created my own script interacts with gnuplot. By this change, my script may be draw different time axis range according to the version of gnuplot.
How do I know which epoch date is used in running version of gnuplot on the fly.
If there is no way to do it, I wish there were the solution like,
gnuplot> print EPOCH
gnuplot> print second("2000-01-01")