mlDateTime.h

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/*************************************************************************************
**
** Copyright 2007, MeVis Medical Solutions AG
**
** The user may use this file in accordance with the license agreement provided with
** the Software or, alternatively, in accordance with the terms contained in a
** written agreement between the user and MeVis Medical Solutions AG.
**
** For further information use the contact form at https://www.mevislab.de/contact
**
**************************************************************************************/
 
#ifndef ML_DATE_TIME_H
#define ML_DATE_TIME_H
 
 
//ML-includes
#include "mlUtilsSystem.h"
 
#include <ostream>
#include <optional>
 
 
ML_UTILS_START_NAMESPACE
 
 
//----------------------------------------------------------------------------------
 
//----------------------------------------------------------------------------------
class ML_UTILS_EXPORT DateTime
{
 
public:
 
  using DateTimeIntType = MLint32;
  using DateTimeFloatType = MLdouble;
 
 
  //------------------------------------------------------
  //------------------------------------------------------
 
  DateTime() = default;
  DateTime(const DateTime&) = default;
  DateTime& operator=(const DateTime&) = default;
  DateTime(DateTime&&) = default;
  DateTime& operator=(DateTime&&) = default;
 
  DateTime(DateTimeIntType yearV,     DateTimeIntType monthV,      DateTimeIntType dayV,
           DateTimeIntType hourV = 0, DateTimeIntType minuteV = 0, DateTimeFloatType secondV = 0);
  DateTime(const char* dtString, const char* format = nullptr);
  DateTime(DateTimeIntType linearDaysV, DateTimeFloatType linearSecondsV);
 
 
 
 
 
  //------------------------------------------------------
  //------------------------------------------------------
 
  // All set methods return \c true if the given date is valid.
  // Invalid dates are converted to valid dates, so the
  // return value may be ignored.
 
  // Sets both date and time portion.
  [[nodiscard]] bool set(DateTimeIntType yearV,     DateTimeIntType monthV,      DateTimeIntType dayV,
           DateTimeIntType hourV = 0, DateTimeIntType minuteV = 0, DateTimeFloatType secondV = 0);
  [[nodiscard]] bool set(const char *dtString, const char *format = nullptr);
  [[nodiscard]] bool set(DateTimeIntType linDaysV, DateTimeFloatType linSecondsV);
 
  // Sets date and time portion independently.
  [[nodiscard]] bool setYMD(DateTimeIntType yearV, DateTimeIntType monthV,  DateTimeIntType dayV);
  [[nodiscard]] bool setHMS(DateTimeIntType hourV, DateTimeIntType minuteV, DateTimeFloatType secondV);
 
  // Sets to current date/time.
  DateTime &now();
 
 
 
  //------------------------------------------------------
  //------------------------------------------------------
 
  void get(DateTimeIntType *yearV,     DateTimeIntType *monthV,      DateTimeIntType *dayV,
           DateTimeIntType *hourV = nullptr, DateTimeIntType *minuteV = nullptr, DateTimeFloatType *secondV = nullptr) const;
  void get(char *dtString, const char *format = nullptr) const;
 
  void getYMD(DateTimeIntType *yearV, DateTimeIntType *monthV,  DateTimeIntType *dayV) const;
  void getHMS(DateTimeIntType *hourV, DateTimeIntType *minuteV, DateTimeFloatType *secondV) const;
 
  DateTimeIntType year() const;
  DateTimeIntType month() const;
  DateTimeIntType day() const;
  DateTimeIntType hour() const;
  DateTimeIntType minute() const;
  DateTimeFloatType second() const;
 
  // Returns days within year in the range 0..364 (or 365 for a leap year).
  DateTimeIntType dayInYear() const;
 
  // Returns linear day and seconds counters.
  DateTimeIntType linearDays() const { return _ldays.value_or(0); }
  DateTimeFloatType linearSeconds() const { return _lseconds.value_or(0); }
 
  bool isValid() const;
 
 
 
  //------------------------------------------------------
  //------------------------------------------------------
 
  // Adds given number of days (subtract if days < 0).
  void addDays(DateTimeIntType daysV);
 
  // Adds given number of days (subtract if days < 0).
  // Fractions of a day are allowed.
  void addDays(DateTimeFloatType daysV);
 
  // Adds given number of seconds (subtract if seconds < 0).
  void addSeconds(DateTimeFloatType secondsV);
 
  // Computes time passed since time point \p dateTime, giving the result
  // in days and fractions of a day.
  DateTimeFloatType daysSince(const DateTime &dateTime) const;
 
  // Computes time passed since time point \p dateTime, giving the result
  // in seconds and fractions of a second.
  DateTimeFloatType secondsSince(const DateTime &dateTime) const;
 
 
 
  //------------------------------------------------------
  //------------------------------------------------------
 
  bool operator==(const DateTime &dt) const;
  bool operator!=(const DateTime &dt) const;
  bool operator< (const DateTime &dt) const;
  bool operator<=(const DateTime &dt) const;
  bool operator>=(const DateTime &dt) const;
  bool operator> (const DateTime &dt) const;
 
 
 
  //------------------------------------------------------
  //------------------------------------------------------
 
  // Tests date/time specification for validity.
  static bool validYMD(DateTimeIntType yearV, DateTimeIntType monthV,  DateTimeIntType dayV);
  static bool validHMS(DateTimeIntType hourV, DateTimeIntType minuteV, DateTimeFloatType secondV);
 
  // Returns the number of days for a given month.
  static DateTimeIntType daysOfMonth(DateTimeIntType monthV, DateTimeIntType yearV);
 
  // Returns the number of days for a given year.
  static DateTimeIntType daysOfYear(DateTimeIntType yearV);
 
  // Returns \c true if the given year is a leap year.
  static bool isLeapYear(DateTimeIntType yearV);
 
  // Returns the number of days for the current month.
  DateTimeIntType daysOfMonth() const;
 
  // Returns the number of days for the current year.
  DateTimeIntType daysOfYear() const;
 
  // Returns \c true if the current year is a leap year.
  bool isLeapYear() const;
 
 
private:
 
  void normalize();
 
  std::optional<DateTimeIntType> _ldays;
  std::optional<DateTimeFloatType> _lseconds;
};
 
ML_UTILS_END_NAMESPACE
 
 
//-----------------------------------------------------------------------------------
//   Stream output for std::ostream
//-----------------------------------------------------------------------------------
namespace std {
 
//-----------------------------------------------------------------------------------
//   Stream output for std::ostream
//-----------------------------------------------------------------------------------
  inline ostream& operator<<(ostream& s, const ML_UTILS_NAMESPACE::DateTime &dt)
  {
    s << dt.year()   << ":"
      << dt.month()  << ":"
      << dt.day()    << ":"
      << dt.hour()   << ":"
      << dt.minute() << ":"
      << dt.second();
    return s;
  }
}
 
#endif // __mlDateTime_H