Implement TAxis::GetTimeOffset (root-project#13595)

maksgraczyk · Jan 12, 2024 · a7dcfb9 · a7dcfb9
1 parent 5645039
commit a7dcfb9
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diff --git a/hist/hist/inc/TAxis.h b/hist/hist/inc/TAxis.h
@@ -131,6 +131,7 @@ class TAxis : public TNamed, public TAttAxis {
    virtual Bool_t     GetTimeDisplay() const {return fTimeDisplay;}
    virtual const char *GetTimeFormat() const {return fTimeFormat.Data();}
    virtual const char *GetTimeFormatOnly() const;
+           UInt_t      GetTimeOffset();
    const char        *GetTitle() const override {return fTitle.Data();}
    const TArrayD     *GetXbins() const {return &fXbins;}
            Int_t      GetFirst() const;

diff --git a/hist/hist/src/TAxis.cxx b/hist/hist/src/TAxis.cxx
@@ -609,6 +609,26 @@ const char *TAxis::GetTimeFormatOnly() const
    return timeformat.Data();
 }
 
+////////////////////////////////////////////////////////////////////////////////
+/// Return the time offset in GMT.
+
+UInt_t TAxis::GetTimeOffset() {
+
+  Int_t idF = fTimeFormat.Index("%F")+2;
+  if (idF<2) {
+    Warning("GetGMTimeOffset","Time format is not set!");
+    return 0;
+  }
+  TString stime=fTimeFormat(idF,19);
+  if (stime.Length() != 19) {
+    Warning("GetGMTimeOffset","Bad time format!");
+    return 0;
+  }
+
+  TDatime datime(stime.Data());
+  return datime.Convert(kTRUE);  // Convert to unix gmt time
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 /// Return the ticks option (see SetTicks)