gnuplot-bugs

[Gnuplot-bugs] Incorrect date calculation

[Robert M. <rob...@ya...>]

When doing calculations on a date field the results
are increased by 30-years.  I am guessing this is from
gnuplot storing time as an offset from 1/1/2000.

set format x "%D %a"
set timefmt "%s"
set xdata time
# The following plots correctly
plot '-' using 1:2
1170316800 32.1089031339031
1170403200 31.7189458689459
e
# The following plots with the dates 30 years off
plot '-' using ($1):2
1170316800 32.1089031339031
1170403200 31.7189458689459
e



 
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Re: [Gnuplot-bugs] Incorrect date calculation

[<HBB...@t-...>]

Robert Minsk wrote:
> When doing calculations on a date field the results
> are increased by 30-years.  

Only if you use the wrong data input function to access them.  If 
reading them as plain numbers was the right idea, why do you think the 
"%s" format was added to timefmt?

timecolumn() exists for precisely this reason.