set title "Fsteps plot\nwith date and time as x-values" set style data fsteps set xlabel "Date\nTime" set timefmt "%d/%m/%y\t%H%M" set yrange [ 0 : ] set xdata time set xrange [ "1/6/93":"1/11/93" ] set ylabel "Concentration\nmg/l" set format x "%d/%m\n%H:%M" set grid set key left plot 'timedat.dat' using 1:3 t '', \ 'timedat.dat' using 1:3 t 'Total P' with points, \ 'timedat.dat' using 1:4 t '', \ 'timedat.dat' using 1:4 t 'PO4' with points 
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 set title "Time data on Y, millisecond precision" font ",14" set ydata time set timefmt "%s" set offset 0.5,1.5,.2,.2 unset key fulltime(col) = strftime("%d %b %Y\n%H:%M:%.3S",column(col)) parttime(col) = strftime("%H:%M:%.3S",column(col)) plot '-' using 0:1:(fulltime(1)):xticlabels(2):yticlabels(parttime(1)) \ with labels point pt 7 left offset 1,1 font ",7" 1390852607.1	A 1390852607.2	B 1390852607.4	C 1390852607.8	D 1390852608.4	E 1390852610.001	F e 
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 set title "Date format (top) vs Time format (bottom)" font ":Bold,14" set xrange [-7000:3000] set link x2 set tics font ",8" set x2tics format "%D\n%R" time set xtics format "%tH:%tM:%tS" time set mxtics time 5 min set mx2tics time 5 min set yzeroaxis unset ytics set bmargin at screen .3 set tmargin at screen .6 plot x notitle 
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 print "\nRelative time output (strftime(), axis labels)" t = -3672.5 print 't = ',t print 'print strftime("%.2tM == %.2tS", t)' , "	", strftime("%.2tM min == %.2tS sec", t) print 'print strftime("%tM:%.2tS", t) ' , "	", strftime("%tM:%.2tS", t) print 'print strftime("%tH:%tM:%.2tS", t)' , "	", strftime("%tH:%tM:%.2tS", t) t = 3672.5 print 't = ',t print 'print strftime("%.2tM == %.2tS", t)' , "	", strftime("%.2tM min == %.2tS sec", t) print 'print strftime("%tM:%.2tS", t) ' , "	", strftime("%tM:%.2tS", t) print 'print strftime("%tH:%tM:%.2tS", t)' , "	", strftime("%tH:%tM:%.2tS", t) print "\nRelative time input (strptime(), data files)" print 'print strptime("%tH:%tM:%tS", "-1:01:12.50")', "\t", strptime("%tH:%tM:%tS", "-1:01:12.50") print 'print strptime(" %tM:%tS", "-61:12.50")', "\t", strptime(" %tM:%tS", "-61:12.50") print 'print strptime(" %tS", "-3672.50")', "\t", strptime(" %tS", "-3672.50") print "\nTimezones time output (strftime(), axis labels)" t = 1550496278 print 't = ',t print 'print strftime("%d/%m/%y\t%H:%M", t)' , "	", strftime("%d/%m/%y\t%H:%M", t) print 'print strftime("%d/%m/%y\t%H:%M%z", t)' , "	", strftime("%d/%m/%y\t%H:%M%z", t) print 'print strftime("%d/%m/%y\t%H:%M%Z", t)' , "	", strftime("%d/%m/%y\t%H:%M%Z", t) print "\nTimezones time input (strptime(), data files)" print 'print strptime("%d/%m/%y\t%H:%M", "18/02/19\t13:24")', "\t", strptime("%d/%m/%y\t%H:%M", "18/02/19\t13:24") print 'print strptime("%d/%m/%y\t%H:%M%z", "18/02/19\t12:24+00:00")', "\t", strptime("%d/%m/%y\t%H:%M%z", "18/02/19\t12:24+00:00") print 'print strptime("%d/%m/%y\t%H:%M%z", "18/02/19\t13:24+01:00")', "\t", strptime("%d/%m/%y\t%H:%M%z", "18/02/19\t13:24+01:00") print 'print strptime("%d/%m/%y\t%H:%M %Z", "18/02/19\t13:24 CET")', "\t", strptime("%d/%m/%y\t%H:%M %Z", "18/02/19\t13:24 CET") print 'print strptime("%d/%m/%y\t%H:%M %Z", "18/02/19\t14:24 CEST")', "\t", strptime("%d/%m/%y\t%H:%M %Z", "18/02/19\t14:24 CEST")