From Olivier:  In TGaxis::Paint the member tm_isdst of the tm C struct is set to 0. Before it was -1. -1 meant "daylight saving time is not available". 0 means "daylight saving time is not in effect". See the man pages of mktime for more details. Before this fix the following macro produced an X axis shifted by one hour for the months between April and October (the month is now fixed to July).
From Olivier:
 In TGaxis::Paint the member tm_isdst of the tm C struct is set to 0.
Before it was -1. -1 meant "daylight saving time is not available". 0
means "daylight saving time is not in effect". See the man pages of mktime
for more details. Before this fix the following macro produced an X axis
shifted by one hour for the months between April and October (the month
is now fixed to July).

{
   TCanvas* c = new TCanvas("c","Data",600,500);
   TDatime da(2004,07,09,00,00,00);
   Int_t t0 = da.Convert();
   Int_t dt = 5.*60.*60.;
   TH2F* hiscom = new TH2F("hiscom","",1000,0.,dt,10,0.,1.);
   hiscom->GetXaxis()->SetTimeOffset(t0);
   hiscom->GetXaxis()->SetTimeDisplay(1);
   hiscom->GetXaxis()->SetTimeFormat("%d-%H:%Mh");
   hiscom->GetXaxis()->SetLabelSize(0.021);
   hiscom->GetXaxis()->SetLabelOffset(0.02);
   hiscom->GetXaxis()->SetNdivisions(210);
   hiscom->Draw("");
}


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@9575 27541ba8-7e3a-0410-8455-c3a389f83636

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