#include <iostream>
#include "TString.h"
#include "TError.h"
#include "TDatime.h"

#include <ctime>

TString fTimeFormat="%d/%m/%y%F2023-08-16 12:02:57s0";

UInt_t GetGMTimeOffset() {

  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!");
  
  //  Info("GetGMTimeOffset","String format='%s', index=%d, data='%s'",fTimeFormat.Data(),idF,stime.Data());
  //  return 0;

  TDatime datime(stime.Data());
  
  std::time_t time = datime.Convert()   // Convert to time_t local time, unixtime
    ,localOffset = time - std::mktime(std::gmtime(&time)) // local offset, sec
    ,gmt_time = time - localOffset;     // GMT (UTC) unixtim
  
  Info("GetGMTimeOffset","Unix local time=%ld, time zone offset=%ld, unix GMT time=%ld",time,localOffset,gmt_time);
  
  return gmt_time;
} //GetGMTimeOffset1

int TAxis_GetGMTimeOffset1() {
  UInt_t unix_time = GetGMTimeOffset();
  Info("TAxis_GetGMTimeOffset1","String format='%s', Unix time (GMT): %u",fTimeFormat.Data(),unix_time);
  return 0;
}