{
  TGraph *graph_1 = new TGraph; 
  TGraph *graph_2 = new TGraph;

  graph_1->SetMarkerStyle(kFullCircle);
  graph_1->SetMarkerColor(kRed+1);

  graph_2->SetMarkerStyle(kOpenCircle);
  graph_2->SetMarkerColor(kBlue+1);

  gStyle->SetTimeOffset(0);
  
  TDatime thedate(2016,4,1, 12,00,00);
  graph_1->SetPoint(0, thedate.Convert(), 1.1);
  graph_2->SetPoint(0, thedate.Convert(), 0.2);

  thedate.Set(2016,4,5, 12,00,00);
  graph_1->SetPoint(1, thedate.Convert(), 2.1);
  graph_2->SetPoint(1, thedate.Convert(), -0.1);

  thedate.Set(2016,4,9, 12,00,00);
  graph_1->SetPoint(2, thedate.Convert(), 2.7);
  graph_2->SetPoint(2, thedate.Convert(), 0.2);

  thedate.Set(2016,4,11, 12,00,00);
  graph_1->SetPoint(3, thedate.Convert(), 2.9);
  graph_2->SetPoint(3, thedate.Convert(), 0.1);

  TCanvas *cTimeAxisCan = new TCanvas("cTimeAxisCan","time evolution");
  // cTimeAxisCan->cd();

  TMultiGraph *mg = new TMultiGraph("mg", "WTF?;Day in 2016;something?");
  mg->Add(graph_1);
  mg->Add(graph_2);
  mg->Draw("AP");
  gPad->Modified(); gPad->Update(); // make sure it's really (re)drawn

  TAxis *axis = mg->GetXaxis();
  axis->SetTimeDisplay(1);
  axis->SetTimeFormat("%d/%m");
  axis->SetNdivisions(204,false);
  // axis->SetTitle("Day in 2016");
  gPad->Modified(); gPad->Update(); // make sure it's really (re)drawn

  cTimeAxisCan->Print("TimeEvolution.png");
}