Time series data shifted

[jmkuhn]

I am trying to plot a short time series (a few seconds). With my initial plot, the axis seemed correct but no data was plotted. When I greatly increased the range on the x axis, my data is plotted but shifted by 1 day.

GMT.jl v0.35.0
GMT 6.2.0

using Dates, GMT

starttime = DateTime(2021, 2, 3, 4, 5, 0)
endtime = starttime + Second(4)
x = collect(starttime:Second(1):endtime)
y = collect(0.0:4.0)
plot(x, y, region=(starttime, endtime, 0, 4), lw=:thick, savefig="short_time.png", show=true)
plot(x, y, region=(starttime, endtime + Day(5), 0, 4), lw=:thick, savefig="long_time.png", show=true)

[jmkuhn]

Should TIME_SYSTEM be RATA instead of RD0001?

GMT.jl/src/common_options.jl

Lines 2911 to 2915 in c6bc703

	arg = Dates.value.(arg) ./ 1000; cmd *= " --TIME_SYSTEM=dr0001"
	got_datetime, is_onecol = true, true
	elseif (isa(arg, Matrix{Any}) && typeof(arg[1]) == DateTime) # Matrix with DateTime in first col
	min_max = round_datetime(extrema(view(arg, :, 1)))
	arg[:,1] = Dates.value.(arg[:,1]) ./ 1000; cmd *= " --TIME_SYSTEM=dr0001"

julia> Dates.value(DateTime(0, 12, 31))
0

[joa-quim]

Thanks for looking into this. I'll try to look at it but these summer days with visitors don't leave me much time. I remember to had to pick RD0001 to make this example but otherwise plotting time series is indeed something that lacks more testing.