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3.25.96.1 xtics time_data

In case of timeseries data, axis tic position values must be given as quoted dates or times according to the format timefmt. If the <start>, <incr>, <end> form is used, <start> and <end> must be given according to timefmt, but <incr> must be in seconds. Times will be written out according to the format given on ‘set format‘, however.

Examples:

      set xdata time
      set timefmt "%d/%m"
      set xtics format "%b %d"
      set xrange ["01/12":"06/12"]
      set xtics "01/12", 172800, "05/12"

      set xdata time
      set timefmt "%d/%m"
      set xtics format "%b %d"
      set xrange ["01/12":"06/12"]
      set xtics ("01/12", "" "03/12", "05/12")

Both of these will produce tics "Dec 1", "Dec 3", and "Dec 5", but in the second example the tic at "Dec 3" will be unlabelled.