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+/*  xbdate.h
+
+XBase64 Software Library
+
+Copyright (c) 1997,2003,2014,2022 Gary A Kunkel
+
+The xb64 software library is covered under the terms of the GPL Version 3, 2007 license.
+
+Email Contact:
+
+    XDB-devel@lists.sourceforge.net
+    XDB-users@lists.sourceforge.net
+
+*/
+
+
+#ifndef __XB_XBDATE_H__
+#define __XB_XBDATE_H__
+
+#ifdef  CMAKE_COMPILER_IS_GNUCC
+#pragma interface
+#endif
+
+
+namespace xb{
+
+#define XB_FMT_WEEK   1
+#define XB_FMT_MONTH  2
+#define XB_FMT_YEAR   3
+
+// next value is added to the date calculation to match dbase calculation
+// first valid dbase date is 01/01/0001
+#define JUL_OFFSET  1721425L
+
+
+//! @brief xbDate class.
+/*!
+This xbDate class handles two type of date values:<br>
+
+1) Gregorian dates with a format of CCYYMMDD.  This is how dates are stored in dbf files.<br>
+2) Julian dates calculated as the number of days since 1901-01-01 + 1721425.<br>
+
+Leap Years: The routines in the class support both leap years (one every four 
+years) and leap centuries (one every four hundred years.)
+
+A leap year is a year having 366 days, which can be evenly
+divisible by 4 and not by 100.<br>
+Leap centuries are years which are evenly divisible by 400.<br>
+
+From a programming perspective, Julian dates are useful for date 
+arithmetic, determining the difference between two dates or calculating
+a future or past date.<br>
+
+To determine the difference between two dates,  convert both dates to a 
+Julian date and subtract one from the other.<br>
+
+To calculate a future or past date, convert the base date to a Julian date,
+add (or subtract) the number of days necessary to (from) it and convert the
+julian date back to a Gregorian date.
+*/
+
+class XBDLLEXPORT xbDate : public xbSsv {
+  public:
+
+  xbDate();
+  xbDate( const char * Date8 );
+  xbDate( const xbString &Date8 );
+  xbDate( xbInt32 lJulDate );
+  ~xbDate();
+
+  void operator=( const xbDate &d );
+  void operator+=( xbInt32 i );
+  void operator-=( xbInt32 i );
+  void operator++( xbInt32 i );
+  void operator--( xbInt32 i );
+
+  xbInt32 operator-( const xbDate & ) const;
+  const char * operator-( xbInt32 i );
+  const char * operator+( xbInt32 i );
+
+  xbBool operator==( const xbDate & ) const;
+  xbBool operator!=( const xbDate & ) const;
+  xbBool operator< ( const xbDate & ) const;
+  xbBool operator> ( const xbDate & ) const;
+  xbBool operator<=( const xbDate & ) const;
+  xbBool operator>=( const xbDate & ) const;
+
+  xbInt16     CalcRollingCenturyForYear( xbInt16 year ) const;
+  xbInt16     CenturyOf() const;
+  xbInt16     CharDayOf( xbString &sOutCharDay );
+  xbInt16     CharMonthOf( xbString &sOutCharMonth );
+  xbBool      DateIsValid ( const xbString &sDate8 ) const;
+  xbInt16     DayOf( xbInt16 iFormat ) const;
+  xbInt16     CTOD( const xbString &sCtodInDate );
+//  xbInt16     FormatDate( const char *sFmtIn, xbString &sFmtOut );
+  xbInt16     FormatDate( const xbString &sFmtIn, xbString &sFmtOut );
+  const char  *Str() const;
+  xbBool      IsLeapYear( xbInt16 iYear ) const;
+  xbBool      IsLeapYear() const;
+  xbInt32     JulianDays() const;
+  xbInt16     JulToDate8( xbInt32 lJulDate );
+  xbInt16     LastDayOfMonth();
+  xbInt16     MonthOf() const;
+  xbInt16     Set( const xbString &Date8 );
+  xbInt16     Sysdate();
+  xbInt16     YearOf() const;
+
+#ifdef XB_DEBUG_SUPPORT
+  void        Dump( const char * title );
+  void        DumpDateTables();
+#endif
+
+ private:
+  void SetDateTables();
+  xbString sDate8;              /* CCYYMMDD date format                       ie; 20140718 */
+
+  static int iAggregatedDaysInMonths[2][13];
+  static int iDaysInMonths[2][13];
+};
+
+}         /* namespace */
+#endif    /*__XB_XBDATE_H__ */
+