Adding support for getting numerical day of the week where 0 = Sunday

NTPClient.cpp

@@ -89,13 +89,15 @@ unsigned long NTPClient::getRawTime() {
          ((millis() - this->_lastUpdate) / 1000); // Time since last update
 }
 
+String NTPClient::getDay() {
+  return String(((this->getRawTime()  / 86400L) + 4 ) % 7); //0 is Sunday
+}
 String NTPClient::getHours() {
   return String((this->getRawTime()  % 86400L) / 3600);
 }
 String NTPClient::getMinutes() {
   return String((this->getRawTime() % 3600) / 60);
 }
-
 String NTPClient::getSeconds() {
   return String(this->getRawTime() % 60);
 }

NTPClient.h

@@ -43,6 +43,7 @@ class NTPClient {
      */
     void forceUpdate();
 
+    String getDay();
     String getHours();
     String getMinutes();
     String getSeconds();

keywords.txt

@@ -11,6 +11,7 @@ NTPClient         KEYWORD1
 begin             KEYWORD2
 update            KEYWORD2
 forceUpdate       KEYWORD2
+getDay            KEYWORD2
 getHours          KEYWORD2
 getMinutes        KEYWORD2
 getSeconds        KEYWORD2