#ifndef ALITIMESTAMP_H
#define ALITIMESTAMP_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

// $Id$

#include "TTimeStamp.h"
#include "TString.h"

class AliTimestamp : public TTimeStamp
{
 public:
  AliTimestamp();                               // Default constructor
  AliTimestamp(TTimeStamp& t);                  // Constructor
  virtual ~AliTimestamp();                      // Destructor
  AliTimestamp(const AliTimestamp& t);          // Copy constructor
  void Date(Int_t mode=3);                      // Print date/time info
  Double_t GetJD(Int_t y,Int_t m,Int_t d,Int_t hh,Int_t mm,Int_t ss,Int_t ns) const; // Julian Date from input args.
  Double_t GetMJD(Int_t y,Int_t m,Int_t d,Int_t hh,Int_t mm,Int_t ss,Int_t ns) const;// Modified JD from input args.
  Double_t GetTJD(Int_t y,Int_t m,Int_t d,Int_t hh,Int_t mm,Int_t ss,Int_t ns) const;// Truncated JD from input args.
  Double_t GetJE(Double_t date,TString mode="jd") const; // Julian Epoch corresponding to specified Julian Date
  void Convert(Double_t date,Int_t& days,Int_t& secs,Int_t& ns) const;// Convert frac. day count into days, secs and ns 
  Double_t Convert(Int_t days,Int_t secs,Int_t ns) const;             // Convert days, secs and ns into frac. day count
  void GetMJD(Int_t& mjd,Int_t& sec,Int_t& ns); // Provide corresponding Modified Julian Date and time
  Double_t GetMJD();                            // Provide corresponding Modified Julian Date in fractional days
  void GetTJD(Int_t& mjd,Int_t& sec,Int_t& ns); // Provide corresponding Truncated Julian Date and time
  Double_t GetTJD();                            // Provide corresponding Truncated Julian Date in fractional days
  void GetJD(Int_t& jd,Int_t& sec,Int_t& ns);   // Provide corresponding Julian Date and time
  Double_t GetJD();                             // Provide corresponding Julian Date in fractional days
  Double_t GetJE();                             // Provide corresponding Julian Epoch
  void SetMJD(Int_t mjd,Int_t sec,Int_t ns,Int_t ps=0); // Set Modified Julian Date and time
  void SetMJD(Double_t mjd);                            // Set Modified Julian Date and time
  void SetJD(Int_t jd,Int_t sec,Int_t ns,Int_t ps=0);   // Set Julian Date and time
  void SetJD(Double_t jd);                              // Set Julian Date and time
  void SetTJD(Int_t tjd,Int_t sec,Int_t ns,Int_t ps=0); // Set Truncated Julian Date and time
  void SetTJD(Double_t tjd);                            // Set Truncated Julian Date and time
  void SetNs(Int_t ns);                                 // Set the remaining fractional number of sec in nanoseconds
  Int_t GetNs() const;                                  // Provide remaining fractional number of sec in nanoseconds
  void SetPs(Int_t ps);                                 // Set the remaining fractional number of ns in picoseconds
  Int_t GetPs() const;                                  // Provide remaining fractional number of ns in picoseconds
  using TTimeStamp::Add;
  void Add(Int_t d,Int_t s,Int_t ns,Int_t ps=0);        // Add (or subtract) a certain time difference
  Int_t GetDifference(AliTimestamp* t,Int_t& days,Int_t& sec,Int_t& ns,Int_t& ps); // Provide time difference
  Int_t GetDifference(AliTimestamp& t,Int_t& days,Int_t& sec,Int_t& ns,Int_t& ps); // Provide time difference
  Double_t GetDifference(AliTimestamp* t,TString u,Int_t mode=1); // Provide time diff. in specified units
  Double_t GetDifference(AliTimestamp& t,TString u,Int_t mode=1); // Provide time diff. in specified units

 protected:
  Int_t fMJD;  // Modified Julian Date
  Int_t fJsec; // Number of seconds elapsed within the MJD
  Int_t fJns;  // Remaining fractional number of seconds (in nanoseconds) elapsed within the MJD
  Int_t fJps;  // Remaining fractional number of nanoseconds (in picoseconds) elapsed within the MJD

 private:
  void FillJulian(); // Calculation and setting of the corresponding Julian parameters  
  Int_t fCalcs;      // The TTimeStamp seconds counter value at Julian parameter calculation
  Int_t fCalcns;     // The TTimeStamp nanoseconds counter value at Julian parameter calculation

 ClassDef(AliTimestamp,4) // Handling of timestamps for (astro)particle physics research.
};
#endif