Date: Removed unused ::easter method

- It is duplicated in Dates.cpp.

src/Date.cpp

@@ -573,32 +573,6 @@ int Date::length (const std::string& format)
   return total;
 }
 
-////////////////////////////////////////////////////////////////////////////////
-time_t Date::easter (int year)
-{
-  int Y = year;
-  int a = Y % 19;
-  int b = Y / 100;
-  int c = Y % 100;
-  int d = b / 4;
-  int e = b % 4;
-  int f = (b + 8) / 25;
-  int g = (b - f + 1) / 3;
-  int h = (19 * a + b - d - g + 15) % 30;
-  int i = c / 4;
-  int k = c % 4;
-  int L = (32 + 2 * e + 2 * i - h - k) % 7;
-  int m = (a + 11 * h + 22 * L) / 451;
-  int month = (h + L - 7 * m + 114) / 31;
-  int day = ((h + L - 7 * m + 114) % 31) + 1;
-  struct tm t = {0};
-  t.tm_isdst = -1;   // Requests that mktime determine summer time effect.
-  t.tm_mday  = day;
-  t.tm_mon   = month - 1;
-  t.tm_year  = year - 1900;
-  return mktime (&t);
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 int Date::month () const
 {

src/Date.h

@@ -70,7 +70,6 @@ public:
   static bool valid (const int, const int, const int);
   static bool valid (const int, const int);
 
-  static time_t easter (int year);
   static bool leapYear (int);
   static int daysInMonth (int, int);
   static int daysInYear (int);